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#11
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Q. Will I benefit from different tire size or type?
Thanks to all who have offered very helpful responses, I now have a
much better idea of what tire I need for my city driving -- and the advantages are towards wider tires, so my next tire will not be any skinnier than the 700 x 35 I already have. I am even thinking I might prefer a 700 x 40. I definitely value comfort and safety over speed (although I do a lot of stop and starts as well, because of traffic lights at every block). I guess no one can tell me if a 700 x 40 would be more suited to my needs as I've outlined, so I'm gong to try to get a mountain bike to ride. NOW FOR THE TIRE! I will accept minimal siping if I can't locally find a "full slick" in the 700 x 35/40 size I need. The Michelin Transworld City I mentioned (http://cycleus.webmichelin.com/tires/transworldcity.htm) seems to have some pretty -deep- siping though (the only flat part is a narrow strip of tread in the center). So I'm not sure if its the best choice for safety's sake on pavement. Any better recommendations for COMMONLY AVAILABLE tires, around the same price as the Michelin, that may be "more slick" and thus provide better road contact on the pavement? (I don't know if I can get the IRC or Avocet brands locally; but I know for sure I can get Continental, Hutchinson, Panaracer, Michelin, Vittoria, etc). |
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#12
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Q. Will I benefit from different tire size or type?
Narrower tires will have the advantage of higher pressures. This will
have more effect than the slight difference of rolling resistance. As to traction, as in cornering and stopping, the wider tire will offer more, for the same reason that slicks do. More rubber on the road. Wider will also offer better resistance to pinch flats, and a slightly more comfortable ride on rough or poor pavement. Be sure to consider all aspects of your ride. It's not all as black and white as the tire manufacturers would like you to believe. May you have the wind at your back. And a really low gear for the hills! Chris Chris'Z Corner "The Website for the Common Bicyclist": http://www.geocities.com/czcorner |
#14
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Q. Will I benefit from different tire size or type?
On Sat, 2 Aug 2003 21:34:08 -0500, A Muzi wrote:
of pavement anomalies. Keep the pressure up always but especially if you go to a skinnier tire. In fact, the reason to go to a skinnier tire, afaik, is to be able to use a higher pressure. I recall a thread that discussed rolling resistance; and some studies or experiments or something determined that all things being equal (pressure, tread, compound, bike, rider, temp, humidity, etc), a wider tire actually has less rolling resistance. The real-world result, however, was that narrower tires had lower rolling resistance due to the higher pressures you could use. Does anybody else remember that? I don't think it was on these rec.bicycles newsfroups, but I can't imagine where it WAS if that's the case. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 -- Rick Onanian |
#15
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Q. Will I benefit from different tire size or type?
On Sun, 03 Aug 2003 17:50:48 GMT, OliverS
wrote: However, knobbies take a bit toll on efficiency -- my guess based on my personal performance experienc (somewhat subjective to be sure) about 25%. The exception to that rule being knobbies with a centerline. Such tires tend to be okay, and are often designed to turn pretty well on pavement too. Still, you're much better off with a slick or even a semi-slick, and there's no reason whatsoever to use a knobby unless you're doing moderate-to-heavy off-road riding -- more than just dirt paths, grass, and unpaved sections. -- Rick Onanian |
#16
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Q. Will I benefit from different tire size or type?
RE/
Jobst was away what, a month? According to him (and since he's actually tested this stuff and worked for a tire company, I trust his info), Narrower tires don't have the "advantage" of higher pressures, they need to use higher pressures to achieve the same characteristics (rolling resistance, suspension, and pinch flat resistance) as wider tires. The advantage of narrow tires is better performance due to better Clearly, riding my 1.25" slicks at 90psi is about 20% easier on blacktop than riding my 2.25" WTB's at 40 psi. But in another post (Jobst's?) I got the same impression as I do in this thread: that running my big tires at max pressure vs the 35-40 that I usually run them at wouldn't make it any easier to pedal on blacktop. Have I got it right? ----------------------- PeteCresswell |
#17
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Q. Will I benefit from different tire size or type?
Does it not make sense that the fatter tire will have more rolling
resistance because the contact patch (and thus friction) will be greater with the fatter tire? If you look at vehicles built for straight-line speed (other than those where massive power needs to be transmitted to the ground - definitely NOT bikes) be it soap-box racers to land speed record assault rocket cars, the tires are hard and skinny to minimize rolling resistance. -- - GRL "It's good to want things." Steve Barr (philosopher, poet, humorist, chemist, Visual Basic programmer) "Rick Onanian" wrote in message news On Sat, 2 Aug 2003 21:34:08 -0500, A Muzi wrote: of pavement anomalies. Keep the pressure up always but especially if you go to a skinnier tire. In fact, the reason to go to a skinnier tire, afaik, is to be able to use a higher pressure. I recall a thread that discussed rolling resistance; and some studies or experiments or something determined that all things being equal (pressure, tread, compound, bike, rider, temp, humidity, etc), a wider tire actually has less rolling resistance. The real-world result, however, was that narrower tires had lower rolling resistance due to the higher pressures you could use. Does anybody else remember that? I don't think it was on these rec.bicycles newsfroups, but I can't imagine where it WAS if that's the case. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 -- Rick Onanian |
#18
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Q. Will I benefit from different tire size or type?
"GRL" wrote in message ... Does it not make sense that the fatter tire will have more rolling resistance because the contact patch (and thus friction) will be greater with the fatter tire? Not necessarily. At a given tire pressure and weight, the contact patch is *the same size*, no matter how wide (up to a point). Think PSI. Pounds per sq inch. A 200lb rider/bike creates a 2 sq in patch for a bike tire pumped to 100 psi. No matter what the width or diameter. The contact patch will be a different shape for a wider vs skinnier tire. Wide and short, instead of long and skinny. Less sidewall deformation as the tire rolls. This is, of course, making the huge assumption that all other factors are equal (Tire construction, TPI , pressure, etc). Width (wind resistance) may overcome the difference in Crr. If you look at vehicles built for straight-line speed (other than those where massive power needs to be transmitted to the ground - definitely NOT bikes) be it soap-box racers to land speed record assault rocket cars, the tires are hard and skinny to minimize rolling resistance. They are also skinny to minimise frontal area/wind resistance. Those types of vehicles also do not have to worry about wear, traction in varying conditions, marketing costs, etc. Several tire rr tests have been done in the recumbent community. http://www.beezodogsplace.com/Pages/...Resistance.pdf http://www.legslarry.beerdrinkers.co.uk/tech/GS.htm Pete |
#19
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Q. Will I benefit from different tire size or type?
On Thu, 7 Aug 2003 20:08:29 -0400, GRL wrote:
Does it not make sense that the fatter tire will have more rolling resistance because the contact patch (and thus friction) will be greater with the fatter tire? I thought this too, but I now believe that I was incorrect. See http://www.sheldonbrown.com/tires.html#width If you look at vehicles built for straight-line speed (other than those where massive power needs to be transmitted to the ground - definitely NOT bikes) be it soap-box racers to land speed record assault rocket cars, the tires are hard and skinny to minimize rolling resistance. The narrow tires are more aerodynamic and can take higher pressures. -- Rick Onanian |
#20
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Q. Will I benefit from different tire size or type?
"Rick Onanian" wrote in message news On Fri, 08 Aug 2003 01:08:40 GMT, Pete wrote: A 200lb rider/bike creates a 2 sq in patch for a bike tire pumped to 100 psi. No matter what the width or diameter. Close. Actually, this would be correct: A 200lb rider/unicycle creates a 2 sq in patch for a unicycle tire pumped to 100 psi. No matter what the width or diameter. Forgot that some of the rider's weight is on the _other_ bicycle tire? ok, ok But the concept still stands. Pete |
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