eBike News

On Sunday, September 20, 2020 at 6:18:43 PM UTC-7, pH Steinbruner wrote:
On Wednesday, September 16, 2020 at 5:45:42 PM UTC-7, jbeattie wrote:
I got my wife an eBike for her birthday via my son at Specialized. Box arrived yesterday, and I about herniated myself getting it into the garage. One of these: https://www.bicycling.com/bikes-gear...o-vado-reivew/ I had no idea it was a Buycycling Editor's choice, but I'll go with it. Being family, I got employee pricing -- otherwise it would have been a harder choice. Even the bottom of the range is expensive, but it is a nice bike.

There were some odd-ball assembly issues, and I still have to update the firmware (which is like a huge thing because you want the latest performance advantages!), but it went together fine. Lots of bells (literally) and whistles.

My wife is 5'10" (or used to be), so my son sized her as a large, which is fine for saddle to pedal distance, but the tire height/BB makes the stand-over high, even with a sloping top-tube. The thing is like a mini-motorcycle. She has some neuro/ortho conditions that affect her mobility, but she seems to be fine swinging her leg over the saddle and off the bike. She doesn't complain, which is sometimes a problem. "Oh its fine [followed by catastrophe]." I do worry about the size of the thing, though.

On max setting, the bike is super fast with a top speed of 28mph. I'm going to throw on a QR seatpost clamp so I can use it for shopping. You would need a truck to steal it, and it has a kickstand and a really swanky little rack. The future is now! My son is trying to get me interested in the mega-zillion dollar 22lb stealth eBikes -- so I can keep up with him, but I would need a winning lottery ticket, even at employee pricing.

In another small bicycle-world twist, my son tells me I'll need a hitch rack tray that my wife can roll the bike onto -- made by Yakima. So I walk down the street and ask my neighbor and best bicycling buddy -- who is head of products for Yakima and happened to be working in his yard, for a rack.. Its on the way. Life is good.

-- Jay Beattie.

Hey, Jay...
I'm sure you're aware of the BaFang mid-drive motor kits and their 250W, 500W, 750W and 1KW offerings;

I see they now have a competitor--CYC--that looks pretty slick and claims 3KW and 5KW models.
https://www.cycmotor.com/

seems like chain-snapping time, to me. I had always daydreamed about the 1KW bafang, mainly for its robustness, me being a Clydesdale and all.

I have my 250W elation up at my mom's in flat old Napa, CA. Don't see any more motors in my immedfiate future.

I've seen an Easy Racer (recumbent) that was BaFang equipped...maybe the whiff would like a recumbent? (I like mine.)

pH in Aptos

No recumbent for the wife. Her issues were actually worsened by a recumbent, and she tried and rejected one years ago. Another gift sold!

She slaughtered me on the Vado last night doing ad hoc hill repeats around the neighborhood. I was on my now incredibly quiet, non-motorized commuter bike. She would come by me laughing, which brought back memories of our racing days when we would go training after work, and she would attack when I wasn't paying attention. I was paying attention last night but don't have the watts to beat a class 3 ebike after about three hill sprints.

I think we'll do laps around the neighborhood cemetery this evening. https://www.youtube.com/watch?v=dg8X...nel=pdxwheeler Whiner! https://www.youtube.com/watch?v=mXxZ...nel=MarkPalace River View is like its own little world. https://www.spinlister.com/blog/tryo...d-lake-oswego/

-- Jay Beattie.

Op dinsdag 22 september 2020 om 18:58:48 UTC+2 schreef jbeattie:
On Sunday, September 20, 2020 at 6:18:43 PM UTC-7, pH Steinbruner wrote:
On Wednesday, September 16, 2020 at 5:45:42 PM UTC-7, jbeattie wrote:
I got my wife an eBike for her birthday via my son at Specialized. Box arrived yesterday, and I about herniated myself getting it into the garage. One of these: https://www.bicycling.com/bikes-gear...o-vado-reivew/ I had no idea it was a Buycycling Editor's choice, but I'll go with it. Being family, I got employee pricing -- otherwise it would have been a harder choice. Even the bottom of the range is expensive, but it is a nice bike.

There were some odd-ball assembly issues, and I still have to update the firmware (which is like a huge thing because you want the latest performance advantages!), but it went together fine. Lots of bells (literally) and whistles.

My wife is 5'10" (or used to be), so my son sized her as a large, which is fine for saddle to pedal distance, but the tire height/BB makes the stand-over high, even with a sloping top-tube. The thing is like a mini-motorcycle. She has some neuro/ortho conditions that affect her mobility, but she seems to be fine swinging her leg over the saddle and off the bike. She doesn't complain, which is sometimes a problem. "Oh its fine [followed by catastrophe]." I do worry about the size of the thing, though.

On max setting, the bike is super fast with a top speed of 28mph. I'm going to throw on a QR seatpost clamp so I can use it for shopping. You would need a truck to steal it, and it has a kickstand and a really swanky little rack. The future is now! My son is trying to get me interested in the mega-zillion dollar 22lb stealth eBikes -- so I can keep up with him, but I would need a winning lottery ticket, even at employee pricing.

In another small bicycle-world twist, my son tells me I'll need a hitch rack tray that my wife can roll the bike onto -- made by Yakima. So I walk down the street and ask my neighbor and best bicycling buddy -- who is head of products for Yakima and happened to be working in his yard, for a rack. Its on the way. Life is good.

-- Jay Beattie.

Hey, Jay...
I'm sure you're aware of the BaFang mid-drive motor kits and their 250W, 500W, 750W and 1KW offerings;

I see they now have a competitor--CYC--that looks pretty slick and claims 3KW and 5KW models.
https://www.cycmotor.com/

seems like chain-snapping time, to me. I had always daydreamed about the 1KW bafang, mainly for its robustness, me being a Clydesdale and all.

I have my 250W elation up at my mom's in flat old Napa, CA. Don't see any more motors in my immedfiate future.

I've seen an Easy Racer (recumbent) that was BaFang equipped...maybe the whiff would like a recumbent? (I like mine.)

pH in Aptos
No recumbent for the wife. Her issues were actually worsened by a recumbent, and she tried and rejected one years ago. Another gift sold!

She slaughtered me on the Vado last night doing ad hoc hill repeats around the neighborhood. I was on my now incredibly quiet, non-motorized commuter bike. She would come by me laughing, which brought back memories of our racing days when we would go training after work, and she would attack when I wasn't paying attention. I was paying attention last night but don't have the watts to beat a class 3 ebike after about three hill sprints.

I think we'll do laps around the neighborhood cemetery this evening. https://www.youtube.com/watch?v=dg8X...nel=pdxwheeler Whiner! https://www.youtube.com/watch?v=mXxZ...nel=MarkPalace River View is like its own little world. https://www.spinlister.com/blog/tryo...d-lake-oswego/

-- Jay Beattie.


Like I said that was a dangerous purchase. Have fun ;-)
9 out of 10 people who bought an E bike never touches a 'normal' bike again..

Lou

Op dinsdag 22 september 2020 om 19:50:15 UTC+2 schreef Lou Holtman:
Op dinsdag 22 september 2020 om 18:58:48 UTC+2 schreef jbeattie:
On Sunday, September 20, 2020 at 6:18:43 PM UTC-7, pH Steinbruner wrote:
On Wednesday, September 16, 2020 at 5:45:42 PM UTC-7, jbeattie wrote:
I got my wife an eBike for her birthday via my son at Specialized. Box arrived yesterday, and I about herniated myself getting it into the garage. One of these: https://www.bicycling.com/bikes-gear...o-vado-reivew/ I had no idea it was a Buycycling Editor's choice, but I'll go with it. Being family, I got employee pricing -- otherwise it would have been a harder choice. Even the bottom of the range is expensive, but it is a nice bike.

There were some odd-ball assembly issues, and I still have to update the firmware (which is like a huge thing because you want the latest performance advantages!), but it went together fine. Lots of bells (literally) and whistles.

My wife is 5'10" (or used to be), so my son sized her as a large, which is fine for saddle to pedal distance, but the tire height/BB makes the stand-over high, even with a sloping top-tube. The thing is like a mini-motorcycle. She has some neuro/ortho conditions that affect her mobility, but she seems to be fine swinging her leg over the saddle and off the bike. She doesn't complain, which is sometimes a problem. "Oh its fine [followed by catastrophe]." I do worry about the size of the thing, though.

On max setting, the bike is super fast with a top speed of 28mph. I'm going to throw on a QR seatpost clamp so I can use it for shopping. You would need a truck to steal it, and it has a kickstand and a really swanky little rack. The future is now! My son is trying to get me interested in the mega-zillion dollar 22lb stealth eBikes -- so I can keep up with him, but I would need a winning lottery ticket, even at employee pricing.

In another small bicycle-world twist, my son tells me I'll need a hitch rack tray that my wife can roll the bike onto -- made by Yakima. So I walk down the street and ask my neighbor and best bicycling buddy -- who is head of products for Yakima and happened to be working in his yard, for a rack. Its on the way. Life is good.

-- Jay Beattie.

Hey, Jay...
I'm sure you're aware of the BaFang mid-drive motor kits and their 250W, 500W, 750W and 1KW offerings;

I see they now have a competitor--CYC--that looks pretty slick and claims 3KW and 5KW models.
https://www.cycmotor.com/

seems like chain-snapping time, to me. I had always daydreamed about the 1KW bafang, mainly for its robustness, me being a Clydesdale and all.

I have my 250W elation up at my mom's in flat old Napa, CA. Don't see any more motors in my immedfiate future.

I've seen an Easy Racer (recumbent) that was BaFang equipped...maybe the whiff would like a recumbent? (I like mine.)

pH in Aptos
No recumbent for the wife. Her issues were actually worsened by a recumbent, and she tried and rejected one years ago. Another gift sold!

She slaughtered me on the Vado last night doing ad hoc hill repeats around the neighborhood. I was on my now incredibly quiet, non-motorized commuter bike. She would come by me laughing, which brought back memories of our racing days when we would go training after work, and she would attack when I wasn't paying attention. I was paying attention last night but don't have the watts to beat a class 3 ebike after about three hill sprints.

I think we'll do laps around the neighborhood cemetery this evening. https://www.youtube.com/watch?v=dg8X...nel=pdxwheeler Whiner! https://www.youtube.com/watch?v=mXxZ...nel=MarkPalace River View is like its own little world. https://www.spinlister.com/blog/tryo...d-lake-oswego/

-- Jay Beattie.
Like I said that was a dangerous purchase. Have fun ;-)
9 out of 10 people who bought an E bike never touches a 'normal' bike again.

Lou

Oh, forgot to mention, 9.5 out of 10 people who bought an E bike for the wife/husband end up with an E bike also after a while. Ouch..

Lou

Frank Krygowski wrote:
On 9/22/2020 10:37 AM, Ralph Barone wrote:
Lou Holtman wrote:
Op dinsdag 22 september 2020 om 03:58:57 UTC+2 schreef Frank Krygowski:
On 9/21/2020 2:26 PM, Lou Holtman wrote:

Two weeks ago I was in the mountains climbing. Before I left I weighed
bike and myself, both in riding condition. There is a 10 km climb with
an almost constant grade; about 7%.:
https://photos.app.goo.gl/oTwizyDjQ59vMX2p9
I resetted my Garmin at the bottom of the climb. At the top I looked at
the average power I managed and I calculated my climbing time within 30
seconds accuracy from the average power and weight.
I assume your calculations were done the simplest way, ignoring any aero
drag, right? Aero drag would be minimal at normal climbing speeds for a
7% grade.


--
- Frank Krygowski


Yes simple calculation. I assumed 20 Watts rolling resistance. No aero
drag at speeds of 10-12 km/hr.

Lou


As a really rough estimate, I take sustained speed x % grade as an
indication of power (in really weird units, of course).

Note that to give good accuracy, the calculation doesn't require inputs
regarding number or spacing of gears, frame stiffness, type of shifters,
type of pedals or even color of paint. (Despite the fact that red bikes
are obviously faster.)

Yet those factors and others are claimed to make bikes much faster.



The sudden loss of power coincided with my bike changing colours from pea
soup green to metallic emerald green. Don’t be discounting paint (although
I had hoped it would push things in the other direction).

On Tuesday, September 22, 2020 at 9:58:48 AM UTC-7, jbeattie wrote:
On Sunday, September 20, 2020 at 6:18:43 PM UTC-7, pH Steinbruner wrote:
On Wednesday, September 16, 2020 at 5:45:42 PM UTC-7, jbeattie wrote:
I got my wife an eBike for her birthday via my son at Specialized. Box arrived yesterday, and I about herniated myself getting it into the garage. One of these: https://www.bicycling.com/bikes-gear...o-vado-reivew/ I had no idea it was a Buycycling Editor's choice, but I'll go with it. Being family, I got employee pricing -- otherwise it would have been a harder choice. Even the bottom of the range is expensive, but it is a nice bike.

There were some odd-ball assembly issues, and I still have to update the firmware (which is like a huge thing because you want the latest performance advantages!), but it went together fine. Lots of bells (literally) and whistles.

My wife is 5'10" (or used to be), so my son sized her as a large, which is fine for saddle to pedal distance, but the tire height/BB makes the stand-over high, even with a sloping top-tube. The thing is like a mini-motorcycle. She has some neuro/ortho conditions that affect her mobility, but she seems to be fine swinging her leg over the saddle and off the bike. She doesn't complain, which is sometimes a problem. "Oh its fine [followed by catastrophe]." I do worry about the size of the thing, though.

On max setting, the bike is super fast with a top speed of 28mph. I'm going to throw on a QR seatpost clamp so I can use it for shopping. You would need a truck to steal it, and it has a kickstand and a really swanky little rack. The future is now! My son is trying to get me interested in the mega-zillion dollar 22lb stealth eBikes -- so I can keep up with him, but I would need a winning lottery ticket, even at employee pricing.

In another small bicycle-world twist, my son tells me I'll need a hitch rack tray that my wife can roll the bike onto -- made by Yakima. So I walk down the street and ask my neighbor and best bicycling buddy -- who is head of products for Yakima and happened to be working in his yard, for a rack. Its on the way. Life is good.

-- Jay Beattie.

Hey, Jay...
I'm sure you're aware of the BaFang mid-drive motor kits and their 250W, 500W, 750W and 1KW offerings;

I see they now have a competitor--CYC--that looks pretty slick and claims 3KW and 5KW models.
https://www.cycmotor.com/

seems like chain-snapping time, to me. I had always daydreamed about the 1KW bafang, mainly for its robustness, me being a Clydesdale and all.

I have my 250W elation up at my mom's in flat old Napa, CA. Don't see any more motors in my immedfiate future.

I've seen an Easy Racer (recumbent) that was BaFang equipped...maybe the whiff would like a recumbent? (I like mine.)

pH in Aptos
No recumbent for the wife. Her issues were actually worsened by a recumbent, and she tried and rejected one years ago. Another gift sold!

She slaughtered me on the Vado last night doing ad hoc hill repeats around the neighborhood. I was on my now incredibly quiet, non-motorized commuter bike. She would come by me laughing, which brought back memories of our racing days when we would go training after work, and she would attack when I wasn't paying attention. I was paying attention last night but don't have the watts to beat a class 3 ebike after about three hill sprints.

I think we'll do laps around the neighborhood cemetery this evening. https://www.youtube.com/watch?v=dg8X...nel=pdxwheeler Whiner! https://www.youtube.com/watch?v=mXxZ...nel=MarkPalace River View is like its own little world. https://www.spinlister.com/blog/tryo...d-lake-oswego/

-- Jay Beattie.

Sounds like electric has brought back the joys of riding for her. This can only be a good thing. (Maybe Joy will want one, too.)

I agree with Andre that we really don't need uber-power. (this is personality dependent, of course...I *do* own a Morris Minor, after all) Maybe if you are a gnarly off roader.
The reason I wanted the 1kw bafeng is that the build was reportedly much beefier. It could easily be programmed to run at the 750 watt level. For me, longevity is as important as the power, maybe even more important. I want it to last 10 years/10,00 miles. Doubt that's possible, though.

As whiff piles on the miles I will be eagerly awaiting your reports on the thing.

pH in Aptos

On Tue, 22 Sep 2020 19:04:04 +0000 (UTC), Ralph Barone
wrote:

Frank Krygowski wrote:
On 9/22/2020 10:37 AM, Ralph Barone wrote:
Lou Holtman wrote:
Op dinsdag 22 september 2020 om 03:58:57 UTC+2 schreef Frank Krygowski:
On 9/21/2020 2:26 PM, Lou Holtman wrote:

Two weeks ago I was in the mountains climbing. Before I left I weighed
bike and myself, both in riding condition. There is a 10 km climb with
an almost constant grade; about 7%.:
https://photos.app.goo.gl/oTwizyDjQ59vMX2p9
I resetted my Garmin at the bottom of the climb. At the top I looked at
the average power I managed and I calculated my climbing time within 30
seconds accuracy from the average power and weight.
I assume your calculations were done the simplest way, ignoring any aero
drag, right? Aero drag would be minimal at normal climbing speeds for a
7% grade.


--
- Frank Krygowski


Yes simple calculation. I assumed 20 Watts rolling resistance. No aero
drag at speeds of 10-12 km/hr.

Lou


As a really rough estimate, I take sustained speed x % grade as an
indication of power (in really weird units, of course).

Note that to give good accuracy, the calculation doesn't require inputs
regarding number or spacing of gears, frame stiffness, type of shifters,
type of pedals or even color of paint. (Despite the fact that red bikes
are obviously faster.)

Yet those factors and others are claimed to make bikes much faster.



The sudden loss of power coincided with my bike changing colours from pea
soup green to metallic emerald green. Don’t be discounting paint (although
I had hoped it would push things in the other direction).

Hmmm... if paint colors effect speed then it is logical to assume that
the bare aluminum frames must be substantially slower? Or is bright
and shiny faster then grotty green?
--
Cheers,

John B.

John B. wrote:
On Tue, 22 Sep 2020 19:04:04 +0000 (UTC), Ralph Barone
wrote:

Frank Krygowski wrote:
On 9/22/2020 10:37 AM, Ralph Barone wrote:
Lou Holtman wrote:
Op dinsdag 22 september 2020 om 03:58:57 UTC+2 schreef Frank Krygowski:
On 9/21/2020 2:26 PM, Lou Holtman wrote:

Two weeks ago I was in the mountains climbing. Before I left I weighed
bike and myself, both in riding condition. There is a 10 km climb with
an almost constant grade; about 7%.:
https://photos.app.goo.gl/oTwizyDjQ59vMX2p9
I resetted my Garmin at the bottom of the climb. At the top I looked at
the average power I managed and I calculated my climbing time within 30
seconds accuracy from the average power and weight.
I assume your calculations were done the simplest way, ignoring any aero
drag, right? Aero drag would be minimal at normal climbing speeds for a
7% grade.


--
- Frank Krygowski


Yes simple calculation. I assumed 20 Watts rolling resistance. No aero
drag at speeds of 10-12 km/hr.

Lou


As a really rough estimate, I take sustained speed x % grade as an
indication of power (in really weird units, of course).

Note that to give good accuracy, the calculation doesn't require inputs
regarding number or spacing of gears, frame stiffness, type of shifters,
type of pedals or even color of paint. (Despite the fact that red bikes
are obviously faster.)

Yet those factors and others are claimed to make bikes much faster.



The sudden loss of power coincided with my bike changing colours from pea
soup green to metallic emerald green. DonÂ’t be discounting paint (although
I had hoped it would push things in the other direction).

Hmmm... if paint colors effect speed then it is logical to assume that
the bare aluminum frames must be substantially slower? Or is bright
and shiny faster then grotty green?

That’s what I did! I didn’t strip off the old powder coat before priming
and painting on top of it and unwittingly made my frame heavier by painting
it. Paint is a lot heavier than you might think... :-)

On Wed, 23 Sep 2020 00:37:16 +0000 (UTC), Ralph Barone
wrote:

John B. wrote:
On Tue, 22 Sep 2020 19:04:04 +0000 (UTC), Ralph Barone
wrote:

Frank Krygowski wrote:
On 9/22/2020 10:37 AM, Ralph Barone wrote:
Lou Holtman wrote:
Op dinsdag 22 september 2020 om 03:58:57 UTC+2 schreef Frank Krygowski:
On 9/21/2020 2:26 PM, Lou Holtman wrote:

Two weeks ago I was in the mountains climbing. Before I left I weighed
bike and myself, both in riding condition. There is a 10 km climb with
an almost constant grade; about 7%.:
https://photos.app.goo.gl/oTwizyDjQ59vMX2p9
I resetted my Garmin at the bottom of the climb. At the top I looked at
the average power I managed and I calculated my climbing time within 30
seconds accuracy from the average power and weight.
I assume your calculations were done the simplest way, ignoring any aero
drag, right? Aero drag would be minimal at normal climbing speeds for a
7% grade.


--
- Frank Krygowski


Yes simple calculation. I assumed 20 Watts rolling resistance. No aero
drag at speeds of 10-12 km/hr.

Lou


As a really rough estimate, I take sustained speed x % grade as an
indication of power (in really weird units, of course).

Note that to give good accuracy, the calculation doesn't require inputs
regarding number or spacing of gears, frame stiffness, type of shifters,
type of pedals or even color of paint. (Despite the fact that red bikes
are obviously faster.)

Yet those factors and others are claimed to make bikes much faster.



The sudden loss of power coincided with my bike changing colours from pea
soup green to metallic emerald green. Don?t be discounting paint (although
I had hoped it would push things in the other direction).

Hmmm... if paint colors effect speed then it is logical to assume that
the bare aluminum frames must be substantially slower? Or is bright
and shiny faster then grotty green?

That’s what I did! I didn’t strip off the old powder coat before priming
and painting on top of it and unwittingly made my frame heavier by painting
it. Paint is a lot heavier than you might think... :-)

I have read that painting a commercial airplane such as the Boring 747
adds approximately 550 lbs to the weight of the airplane.
--
Cheers,

John B.

On 9/22/2020 12:58 PM, jbeattie wrote:

I think we'll do laps around the neighborhood cemetery this evening. https://www.youtube.com/watch?v=dg8X...nel=pdxwheeler Whiner! https://www.youtube.com/watch?v=mXxZ...nel=MarkPalace River View is like its own little world. https://www.spinlister.com/blog/tryo...d-lake-oswego/

Cemeteries can be very beautiful. There are two near me that I regularly
ride through for the architecture, sculpture and tranquility. I'm told
by a historian friend that around Victorian times, people would picnic
in cemeteries. She claims cemeteries were the inspiration for city parks.

Several times I've led a club ride I call "Tour de Tombs," visiting
several historic cemeteries in our area, stopping at graves of local
historic figures.

--
- Frank Krygowski

John B. wrote:
On Wed, 23 Sep 2020 00:37:16 +0000 (UTC), Ralph Barone
wrote:

John B. wrote:
On Tue, 22 Sep 2020 19:04:04 +0000 (UTC), Ralph Barone
wrote:

Frank Krygowski wrote:
On 9/22/2020 10:37 AM, Ralph Barone wrote:
Lou Holtman wrote:
Op dinsdag 22 september 2020 om 03:58:57 UTC+2 schreef Frank Krygowski:
On 9/21/2020 2:26 PM, Lou Holtman wrote:

Two weeks ago I was in the mountains climbing. Before I left I weighed
bike and myself, both in riding condition. There is a 10 km climb with
an almost constant grade; about 7%.:
https://photos.app.goo.gl/oTwizyDjQ59vMX2p9
I resetted my Garmin at the bottom of the climb. At the top I looked at
the average power I managed and I calculated my climbing time within 30
seconds accuracy from the average power and weight.
I assume your calculations were done the simplest way, ignoring any aero
drag, right? Aero drag would be minimal at normal climbing speeds for a
7% grade.


--
- Frank Krygowski


Yes simple calculation. I assumed 20 Watts rolling resistance. No aero
drag at speeds of 10-12 km/hr.

Lou


As a really rough estimate, I take sustained speed x % grade as an
indication of power (in really weird units, of course).

Note that to give good accuracy, the calculation doesn't require inputs
regarding number or spacing of gears, frame stiffness, type of shifters,
type of pedals or even color of paint. (Despite the fact that red bikes
are obviously faster.)

Yet those factors and others are claimed to make bikes much faster.



The sudden loss of power coincided with my bike changing colours from pea
soup green to metallic emerald green. Don?t be discounting paint (although
I had hoped it would push things in the other direction).

Hmmm... if paint colors effect speed then it is logical to assume that
the bare aluminum frames must be substantially slower? Or is bright
and shiny faster then grotty green?

That’s what I did! I didn’t strip off the old powder coat before priming
and painting on top of it and unwittingly made my frame heavier by painting
it. Paint is a lot heavier than you might think... :-)

I have read that painting a commercial airplane such as the Boring 747
adds approximately 550 lbs to the weight of the airplane.

Judging by my reduction in speed, there must be a good 100 lbs of paint on
my bike.