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#21
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MTB low pressure and pinch flats
On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote:
On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. |
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#23
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MTB low pressure and pinch flats
On Friday, May 19, 2017 at 9:28:46 AM UTC-7, Joerg wrote:
On 2017-05-19 08:24, wrote: On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. Yes, full sus but mine is a classic aluminum deal and with all the additions including very thick tubes it weighs around 38lbs: http://www.analogconsultants.com/ng/bike/Muddy3.JPG The seat on MTB is usually far behind the bike's CG and that makes it rear up. Although my road bike also rears up when I really step on it upon a traffic light turning green uphill. My Trek x-Bontrager had the seat on or ahead of the CG and you could not get it to lift the front end. |
#24
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MTB low pressure and pinch flats
On 2017-05-19 09:49, wrote:
On Friday, May 19, 2017 at 9:28:46 AM UTC-7, Joerg wrote: On 2017-05-19 08:24, wrote: On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. Yes, full sus but mine is a classic aluminum deal and with all the additions including very thick tubes it weighs around 38lbs: http://www.analogconsultants.com/ng/bike/Muddy3.JPG The seat on MTB is usually far behind the bike's CG and that makes it rear up. Although my road bike also rears up when I really step on it upon a traffic light turning green uphill. My Trek x-Bontrager had the seat on or ahead of the CG and you could not get it to lift the front end. Ok, but most modern MTB aren't built that way anymore. Part of the reason is probably to reduce the risk of an endo. I also have to do bunny hops very often because of the terrain and I don't want that to require herculean forces every time. -- Regards, Joerg http://www.analogconsultants.com/ |
#25
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MTB low pressure and pinch flats
On Friday, May 19, 2017 at 11:19:38 AM UTC-7, Joerg wrote:
On 2017-05-19 09:49, wrote: On Friday, May 19, 2017 at 9:28:46 AM UTC-7, Joerg wrote: On 2017-05-19 08:24, wrote: On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. Yes, full sus but mine is a classic aluminum deal and with all the additions including very thick tubes it weighs around 38lbs: http://www.analogconsultants.com/ng/bike/Muddy3.JPG The seat on MTB is usually far behind the bike's CG and that makes it rear up. Although my road bike also rears up when I really step on it upon a traffic light turning green uphill. My Trek x-Bontrager had the seat on or ahead of the CG and you could not get it to lift the front end. Ok, but most modern MTB aren't built that way anymore. Part of the reason is probably to reduce the risk of an endo. I also have to do bunny hops very often because of the terrain and I don't want that to require herculean forces every time. I didn't mean Bontrager - I meant Gary Fisher that was reproduced almost exactly by Trek. It was the AL model just before this one: http://www.ebay.com/itm/Trek-Superfl...AOSwax5Y1d4 X As you can see the weight of the rider is centered. |
#26
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MTB low pressure and pinch flats
On 2017-05-19 15:22, wrote:
On Friday, May 19, 2017 at 11:19:38 AM UTC-7, Joerg wrote: On 2017-05-19 09:49, wrote: On Friday, May 19, 2017 at 9:28:46 AM UTC-7, Joerg wrote: On 2017-05-19 08:24, wrote: On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. Yes, full sus but mine is a classic aluminum deal and with all the additions including very thick tubes it weighs around 38lbs: http://www.analogconsultants.com/ng/bike/Muddy3.JPG The seat on MTB is usually far behind the bike's CG and that makes it rear up. Although my road bike also rears up when I really step on it upon a traffic light turning green uphill. My Trek x-Bontrager had the seat on or ahead of the CG and you could not get it to lift the front end. Ok, but most modern MTB aren't built that way anymore. Part of the reason is probably to reduce the risk of an endo. I also have to do bunny hops very often because of the terrain and I don't want that to require herculean forces every time. I didn't mean Bontrager - I meant Gary Fisher that was reproduced almost exactly by Trek. It was the AL model just before this one: http://www.ebay.com/itm/Trek-Superfl...AOSwax5Y1d4 X As you can see the weight of the rider is centered. ?? The seat is almost above the rear axle. How can the rider's weight be centered? On steep uphill sections of trails that bike will rear up just as much as mine. https://www.youtube.com/watch?v=WkS8nzvqfPA This is in German but the pics show it: https://www.youtube.com/watch?v=MC0DhR4WfSs -- Regards, Joerg http://www.analogconsultants.com/ |
#27
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MTB low pressure and pinch flats
On Friday, May 19, 2017 at 3:29:49 AM UTC-4, John B. wrote:
Snipped Yup. I read "rigid frame" and stopped. But of course the original "mountain bikes" were all solid frame. Of course they didn't refer to them as MTB's but some of their rides were rather stimulating :-) https://www.youtube.com/watch?v=SVWP6VaLtvw -- Cheers, John B. The original mountain bikes were sold and marketed/advertised as "MOUNTAIN BIKES". I guees that M.T.B. stands for Multi-Terrain Bikes. That video your link is to is blocked here. I can't see it. Cheers |
#28
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MTB low pressure and pinch flats
On Friday, May 19, 2017 at 11:24:21 AM UTC-4, wrote:
On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. You can quite easily lift the front end on just about any bicycle if the hill is steep enough and the gear you're using is low enough. Sometimes when i tour on fire/logging/mining roads i'll pack the front end of the bike heavier than the rear just to help keep that front wheel on the ground when there are a lot of short steep climbs to make.Riding uop those hills even at a walking pace 9or slower) is LOT easire than trying to push the loaded bike up them. YMMV Cheers |
#29
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MTB low pressure and pinch flats
On Fri, 19 May 2017 18:37:09 -0700 (PDT), Sir Ridesalot
wrote: On Friday, May 19, 2017 at 3:29:49 AM UTC-4, John B. wrote: Snipped Yup. I read "rigid frame" and stopped. But of course the original "mountain bikes" were all solid frame. Of course they didn't refer to them as MTB's but some of their rides were rather stimulating :-) https://www.youtube.com/watch?v=SVWP6VaLtvw -- Cheers, John B. The original mountain bikes were sold and marketed/advertised as "MOUNTAIN BIKES". I guees that M.T.B. stands for Multi-Terrain Bikes. See http://cbklunkers.com/page.cfm?pageid=13 or google on "Bicycle+Klunker" to find out the origins of mountain biking. I assume that they qualified as "mountain bikes" anyway as they were build to ride down mountains :-) The original "mountain bikes" weren't ,manufactured, they were home made. The first commercial made (actually a custom order) "Mountain Bike" was made in 1979 by Tom Ritchey. "In 1979 Tom Ritchey of Redwood City, California (50 miles south of Marin) started building fat-tire frames. From 1980 onward he built hundreds of fat-tire bike frames each year. These were the first bikes sold by Gary Fisher and Charlie Kelly, founders of MountainBikes (later the Gary Fisher Bicycle Company)." That video your link is to is blocked here. I can't see it. Cheers -- Cheers, John B. |
#30
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MTB low pressure and pinch flats
On Fri, 19 May 2017 18:42:39 -0700 (PDT), Sir Ridesalot
wrote: On Friday, May 19, 2017 at 11:24:21 AM UTC-4, wrote: On Friday, May 19, 2017 at 7:51:37 AM UTC-7, Joerg wrote: On 2017-05-19 06:30, wrote: When you're on a real steep off-road climb you sit. The front end is so heavy that you can't lift them off of the ground with a low gear so you don't have to stand. Not really. The front coming off the ground is a common occurrence on a MTB. There are climbs where I have to not just stand but also bend my upper body over the handlebar so this does not happen. Are you talking about full suspension bikes? Maybe on the latest super-light full carbon fiber bikes. You can quite easily lift the front end on just about any bicycle if the hill is steep enough and the gear you're using is low enough. Sometimes when i tour on fire/logging/mining roads i'll pack the front end of the bike heavier than the rear just to help keep that front wheel on the ground when there are a lot of short steep climbs to make.Riding uop those hills even at a walking pace 9or slower) is LOT easire than trying to push the loaded bike up them. YMMV Cheers There is a short stretch of road (that I try to avoid) leading from a parking lot up to the street that is steep enough that one is in the lowest gear and steep enough that the front wheel coming off the ground is a real threat. My approach is seated and leaning over the handlebars. -- Cheers, John B. |
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