Wheel weight

On 7/3/19 2:11 pm, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?

I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride for 10
hrs, that's 30 watt-hrs. Assuming an inefficient 5V USB battery
charger, that's 6 amp-hrs or 6,000 ma-hrs. Assuming a smartphone with
a modest 2,000 ma-hr battery inside, you could completely recharge
your battery 3 times during your 10 hr ride. If you don't want the
added load while climbing hills, then you can recharge perhaps 1.5
times during the ride. If you use an mapping app that allows you to
store maps on your smartphone, you don't need cellular connectivity
during the ride and can therefore operating in airplane mode to save
power.



Oh, and the reason I know that 3W isn't quite enough, is because my
nephew tried it and his phone kept loosing battery power while being
charged by the dynamo.

--
JS

On Thu, 7 Mar 2019 18:34:12 +1100, James
wrote:

On 7/3/19 1:50 pm, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)


I once rode from near Gatwick airport to Brighton beach and back, all on
small roads through villages. I had a paper map with me (before smart
phones), and it was really frustrating to have to stop every few minutes
to look at the map and memorise the next few turns. So many roads. So
many little villages.

I've never been to England but riding in Bangkok it is just a matter
of counting turns - "after 4 turns turn left". In fact the only time I
ever got lost riding in Bangkok I was using my hand phone with OsmAnd.
When I finally figured out where I was I was 100 KM from home :-(

--
Cheers,
John B.

On Wednesday, March 6, 2019 at 8:55:47 PM UTC-5, James wrote:
On 7/3/19 1:35 am, Zen Cycle wrote:


There's also the ability to track more than a few satellites.
Mathematically you only need three for acquisition, but the more
satellites you track, the more accurate your calculation will be.
Early and chepaer GPS units would only track three or four, since the
smaller microcontrollers can only handle juggling so much data. More
elaborate GPS systems will track as many satellites as they can see.
A system I worked on recently could log up to 26 at once, though we
generally considered 9 to be optimal for the system architecture and
the application.


Yes, and even relatively cheap modern receivers can track not only more
US satellites, but also Russian and Chinese satellites, like this.

https://www.u-blox.com/en/product/sparkfun-gps-receiver

--
JS

low-cost GPS ASICs with GLONASS compatibility are readily available. The application I mentioned above was US military, and GLONASS was part of the design requirement.

On Wednesday, March 6, 2019 at 10:11:51 PM UTC-5, Jeff Liebermann wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?

I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.

The average bicycle dynamo can deliver 3 watts. If you ride for 10
hrs, that's 30 watt-hrs. Assuming an inefficient 5V USB battery
charger, that's 6 amp-hrs or 6,000 ma-hrs. Assuming a smartphone with
a modest 2,000 ma-hr battery inside, you could completely recharge
your battery 3 times during your 10 hr ride. If you don't want the
added load while climbing hills, then you can recharge perhaps 1.5
times during the ride. If you use an mapping app that allows you to
store maps on your smartphone, you don't need cellular connectivity
during the ride and can therefore operating in airplane mode to save
power.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

I bought a USB auxiliary battery, rated at 2800 mAh. I've gone on all-day excursions with the external battery plugged in and still had the primary battery show 100% at the end of the ride. However, I usually blank the display until I need it. The device displays are usually the biggest power drain in most tracking system, sometimes by a couple orders of magnitude. If you can resist display gazing while you ride and only turn it on when you need it, you can usually get more than a few hours even with the primary batteries.

On 3/6/2019 8:50 PM, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)

A sticker on the monitors here says, "Computers allow you to
make mistakes with greater confidence."

https://www.theguardian.com/us-news/...in-car-by-snow


--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On 07/03/2019 8:59 a.m., AMuzi wrote:
On 3/6/2019 8:50 PM, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap.Â* That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)

A sticker on the monitors here says, "Computers allow you to make
mistakes with greater confidence."

https://www.theguardian.com/us-news/...in-car-by-snow




We were talking about GPS for a bike ride saving you from having to stop
and read maps.

On 3/7/2019 4:20 AM, John B. Slocomb wrote:
On Thu, 7 Mar 2019 18:34:12 +1100, James
wrote:

On 7/3/19 1:50 pm, John B. Slocomb wrote:
On Thu, 7 Mar 2019 13:09:30 +1100, James
wrote:

On 7/3/19 7:22 am, wrote:


Where do you ride your bike at 15-20 hours at a stretch?


I rode 10 hours for 250 km over two big mountains (Mt Hotham and Falls
Creek), not to mention Tawonga Gap. That would have killed my phone
battery trying to navigate through all the mobile black spots, in a
couple of hours I reckon.


But why? After all the road goes from here to there. Or perhaps there
is a turn off maybe 3 miles down the road. One can only speculate how
the Old Folks could go anywhere... without a GPS :-)


I once rode from near Gatwick airport to Brighton beach and back, all on
small roads through villages. I had a paper map with me (before smart
phones), and it was really frustrating to have to stop every few minutes
to look at the map and memorise the next few turns. So many roads. So
many little villages.

I've never been to England but riding in Bangkok it is just a matter
of counting turns - "after 4 turns turn left".

Seriously, the problem with counting turns is that maps are often not
exact. There are some roads shown on local maps that have never existed.
I think it results from a legal right of way being assigned or designed,
but never used. Also, new roads may have been cut after the map was
printed. And some private drives may look like roads.

When I can, I try to use the distance scale to back up my plans. "Turn
right at 2.4 miles" is usually more reliable than "turn right on the
third road."

Also, maps vary greatly in quality. When we first bike toured in England
(1976) I looked forward to buying Ordinance Survey maps, but couldn't
find any. So we were in hilly Devon, trying to find our way with some
crude tourist map. We got lost several times, usually on roads that took
us up to a microwave tower - that is, the highest roads around. Very,
very frustrating!

--
- Frank Krygowski

On 3/6/2019 2:12 PM, wrote:

GPS based cycling computers with navagation capabilities is one of the best and niciest cycling accesory IMO. Everything in one unit, never have to stop to look at a map, automatic logging and uploading, easy swap between bikes, clean cockpit, user definable datafield (number and content). What is there not to like?

https://photos.app.goo.gl/R11bCJx9DAaYHuDQA (map, cadence and power)

Since nobody else has mentioned this: What frustrates me about GPS is
the lack of context. When I'm following a paper map, I automatically get
a wide area view. With the GPS, I know when to turn and I can see what's
very nearby on the tiny display map, but I don't know what else is
nearby yet out of the display's range.

I'm left with the feeling that I haven't really _been_ there. Also, it
removes the possibility of interesting but spontaneous side trips.

For me, this applies much more to driving, because I rarely use a GPS
while bicycling. I generally plan my bicycling route (perhaps using some
online resources) then follow paper maps as I ride. Those are in my
handlebar bag for easy access. And if I see some particularly charming
little road as I'm riding, I may use the map to see if I should use it
instead of what I had planned.

I pull out my phone's GPS only if there's some confusion.


--
- Frank Krygowski

On Thursday, March 7, 2019 at 11:17:25 AM UTC-5, Frank Krygowski wrote:
Snipped

Seriously, the problem with counting turns is that maps are often not
exact. There are some roads shown on local maps that have never existed.
I think it results from a legal right of way being assigned or designed,
but never used. Also, new roads may have been cut after the map was
printed. And some private drives may look like roads.

When I can, I try to use the distance scale to back up my plans. "Turn
right at 2.4 miles" is usually more reliable than "turn right on the
third road."

Also, maps vary greatly in quality. When we first bike toured in England
(1976) I looked forward to buying Ordinance Survey maps, but couldn't
find any. So we were in hilly Devon, trying to find our way with some
crude tourist map. We got lost several times, usually on roads that took
us up to a microwave tower - that is, the highest roads around. Very,
very frustrating!

--
- Frank Krygowski

Counting turns or roads can be a real problem when touring on fire/logging/mining roads. Even back when I first used topographical maps I used my Cateye wired computer to measure the distances rather than try to count roads or trails. Sometimes a road shown on the map would be mostly overgrown where it left the road I was on and thus would be extremely easy to miss in good weather never mind if it was raining. That's not to mention any new roads made since the last time I was in t hat area.

Cheers

On Wednesday, March 6, 2019 at 5:49:20 PM UTC-8, John B. Slocomb wrote:
On Wed, 6 Mar 2019 19:21:31 -0500, Frank Krygowski
wrote:

On 3/6/2019 6:04 PM, Sir Ridesalot wrote:
On Wednesday, March 6, 2019 at 11:19:45 AM UTC-5, Frank Krygowski wrote:
Snipped

Back in the mid-1980s I got my first cyclometer. For me, it was useful
motivation for training - as in "I'm only going 19 mph? I can go faster
than that!"

Nowadays the data is just depressing. I try not to look at it too much.

--
- Frank Krygowski

I guess that's why some people mount the cyclometer on their seatpost or seat-tube = so they aren't tempted to look at it whilst riding. Yet they have their accumulated mileage at the end of the ride.

Very, very vaguely related: On my folding bike, I installed a Cateye
wireless cyclometer, figuring any wire would eventually get ripped apart
during the frequent folds and unfolds.

But at temperatures less than about 45 Fahrenheit, it would lose contact
with the sending unit. It would say Zero miles per hour, even though I
was sure I was going a _little_ faster than that.

Changing batteries in the sender or display units didn't help. Shifting
the sender to different positions, ahead and behind the fork, didn't
help. I finally fabricated a separate little stub mount to keep the
display part about an inch in front of my handlebar. That seemed to cure
the problem. I guess the handlebar itself was blocking the radio signal.

I use a conventional speedometer to measure pedal rpm by modifying the
settings. The sender is mounted on the chain stay and the display on
the top tube. In several cases I have had the display not see the
sender signal, and checking, it was as you say, the top tube blocking
the signal. The cure is always to move the display back, closer to the
sender. Apparently signal strength is important :-)


My wife's identical bike has a much cheaper Echo brand wireless
cyclometer. It has no such problem.

--
Cheers,
John B.

John, you can get speedo, odometer and cadence wireless instruments for less than $15 off of Ebay. These work very well if you're interested in your cadence.