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#11
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presta valves
Pat wrote:
Furthermore, your pre-ride pump-up is the perfect time to safety-check your wheels and tires: check for loose bearings by shaking the wheel side-to-side; spin the wheels and look for out-of-true wobbles (use brake pad as stationary reference point); iInspect the tread for cuts, bulges, abrasions, any other anomalies. I don't agree with you here; I think the best time to safety check the wheels and tires is post-ride. After all, there you are in the pre-ride, ready and dressed to go riding---and suddenly you see a slit in the side wall. Inspect post-ride and you have time to get things fixed before the next ride. I check my tires after a ride when I put the bike on the rack on the back of my car. The bike is at eye level and it's a good time to do it. But you still have to do a pre-ride check, in case there's a slow leak -- or, if you left the rack trunk open and there's a cat in it -- Mike Kruger "When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl." - Anonymous |
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#12
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presta valves
But you still have to do a pre-ride check, in case there's a slow leak -- or, if you left the rack trunk open and there's a cat in it -- Mike Kruger My pre-ride check consists of me squeezing the tire between thumb and forefinger.... |
#13
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presta valves
"Andrew Price" wrote in message
... On Thu, 12 Jun 2008 00:52:28 -0600, mark wrote: Narrow, high pressure tires need reinflating more often than wide, low pressure tires. Thickness of the tube probably has an effect, as would the quality of the valve. FWIW, I top off my road bike's tires (700x23) before every ride, but I will go a month at a time without reinflating my touring bike's tires (26 x 1.75"). Both have Presta valves. Also my experience - well, almost. I usually manage to do 2 to 3 days (around 40km per day) between topping up my 700x23 road tyres (which I run at 9 bar). The touring bike, with 700x40 tyres inflated to 4.5 bar, goes at least a month before needing a top up. All of these responses have been very helpful. I ride everyday at least 20 miles a day. I will stop worrying and just check them every day. Thanks. |
#14
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presta valves
Pat wrote, On 6/12/2008 10:23 PM:
But you still have to do a pre-ride check, in case there's a slow leak -- or, if you left the rack trunk open and there's a cat in it -- Mike Kruger My pre-ride check consists of me squeezing the tire between thumb and forefinger.... I do that too. But, I also like to give my wheels a spin and see if they are running true and look for any bulges in the tires. It only takes a few seconds. -- Paul D Oosterhout I work for SAIC (but I don't speak for SAIC) |
#15
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My pre-ride check consists of me squeezing the tire between thumb and forefinger.... I do that too. But, I also like to give my wheels a spin and see if they are running true and look for any bulges in the tires. It only takes a few seconds. Paul D Oosterhout Okay, that's good---but I am NOT going to check my tires' air pressure every single dang day! That's being obsessive about it. So what if the air pressure has gone down 2 psi? or even, gasp, 5 psi? Pat in TX |
#16
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presta valves
On Jun 11, 8:25*pm, "mary" wrote:
Is it just me or do tubes with presta valves have to be filled up more often? *It seems like once a week I have to top off the air in the tubes.. Just wondering. Oh and before you ask, yes I make sure the valve is closed all of the way after filling. The tubes themselves leak a little air. Thinner, higher pressure tubes will be worse about this. I've tried a lot of different brands of tubes and lately have been using the Schwalbe standard tubes. They seem to leak less air than the others and seldom need topping up. Smokey |
#17
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"Burr" wrote:
If you are real light you can run less air but the more air the easer it is to turn the crakes but the more you bounce. The tour riders run 160-190psi. I'd be very, very surprised if even one rider in the entire international road racing peloton used pressure that high. Track racers on the velodrome are known to do so, but on the road the energy lost to slamming and vibrating the rider can far exceed any reduction in rolling resistance achieved by using very high tire pressure. Many Tour de France riders still use sewup tires, one of whose major advantages is the ability to run _lower_ pressures without pinch flatting. Chalo |
#18
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"Chalo" wrote in message ... "Burr" wrote: If you are real light you can run less air but the more air the easer it is to turn the crakes but the more you bounce. The tour riders run 160-190psi. I'd be very, very surprised if even one rider in the entire international road racing peloton used pressure that high. Track racers on the velodrome are known to do so, but on the road the energy lost to slamming and vibrating the rider can far exceed any reduction in rolling resistance achieved by using very high tire pressure. Many Tour de France riders still use sewup tires, one of whose major advantages is the ability to run _lower_ pressures without pinch flatting. Chalo I learned something. I "thought" I remembered reading about them running very high pressure. Burr |
#19
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Burr who? wrote:
If you are real light you can run less air but the more air the easer it is to turn the crakes but the more you bounce. The tour riders run 160-190psi. I'd be very, very surprised if even one rider in the entire international road racing peloton used pressure that high. Track racers on the velodrome are known to do so, but on the road the energy lost to slamming and vibrating the rider can far exceed any reduction in rolling resistance achieved by using very high tire pressure. Many Tour de France riders still use sewup tires, one of whose major advantages is the ability to run _lower_ pressures without pinch flatting. Not true. The term "snake bite" pinch flat was coined over patching of such flats in latex tube Clement tubulars. The term was important because it was not generally known that a pinch flat causes two holes (as pinching one's cheek with thumb and forefinger). I learned something. I "thought" I remembered reading about them running very high pressure. Its easy to find all sorts of myth an lore about bicycle racers that can "leap tall buildings in a single bound" http://www.answerbag.com/q_view/110331 Men of steel whose tires are equally hard and fast. Drugs play no role in any of that aura. Don't believe everything you hear about bicycle racers methods and abilities. Jobst Brandt |
#20
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presta valves
Pat wrote:
My pre-ride check consists of me squeezing the tire between thumb and forefinger.... I do that too. But, I also like to give my wheels a spin and see if they are running true and look for any bulges in the tires. It only takes a few seconds. Paul D Oosterhout Okay, that's good---but I am NOT going to check my tires' air pressure every single dang day! That's being obsessive about it. So what if the air pressure has gone down 2 psi? or even, gasp, 5 psi? Pat in TX Of course, when you depress the presta stem, you are going to let out some more air anyhow, but for me, topping the tires off doesn't take long and the tires feel the same every day. |
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