Try to figure out what is more important...a light tire (say 200 grams) that is good to 110 psi or a 240 gram tire good to 145 psi. Is there a method to calculate the tradeoff?
mark sills said:Try to figure out what is more important...a light tire (say 200 grams) that is good to 110 psi or a 240 gram tire good to 145 psi. Is there a method to calculate the tradeoff?
mark sills said:Try to figure out what is more important...a light tire (say 200 grams) that is good to 110 psi or a 240 gram tire good to 145 psi. Is there a method to calculate the tradeoff?
domaindomain said:Yep, fitness will do more for your riding than a few psi or a few grammes off the tyre weight.
However, you would notice a difference between a 240g tyre at 100psi and a beautiful Veloflex record (130g) with a latex tube at the same pressure.
Fitter people would still pass you though (take it from who knows)...!!
The fastest tire would depend what kind of terrain you're racing on, as well as your weight, speeds, and road surface conditions. Best pressure would also depend on these criteria: it's not the max rated pressure on the sidewall, unless you're running on a track or ultra-smooth paved surface.mark sills said:Try to figure out what is more important...a light tire (say 200 grams) that is good to 110 psi or a 240 gram tire good to 145 psi. Is there a method to calculate the tradeoff?
dhk said:Saving 40 grams a tire doesn't appeal to me if I have to compromise on either of these. Today I carried 1200 grams of water and sport drink on my ride, so saving 80 grams isn't that big a deal.
wilmar13 said:But dhk, this is rotational weight!
For roads, the optimal tyre pressure is dependent on the weight of the rider, all other things being equal. The front tyre shouldn't be taken to as high a pressure as the rear, as it bears less weight. I've seen a formula that recommends front 90psi and rear 120psi for me at 88kg (don't ask me where to find such formulae - try google).ajo said:Higher PSI gives higher roller restance on normal roads, approx 110 it the ideal (fastest). Very high PSI is only fastest on real smooth surfaces = wooden velodromes.
domaindomain said:could not agree with you more Iron Donut but psychologically, if it feels faster some people enjoy it more and if that gets more people out on bikes, that's got to be a good thing in my book
capwater said:A pre-ride dump is going to matter far more than 20 grams on a tire.
wilmar13 said:Sounds like the next fad:
"pre-ride power bars, now with laxative for your best performance"
I'd also throw in handling at the top of the list. It doesn't matter how low your weight or rolling resistance is if you're face down in a ditch.dhk said:As a recreational rider I look for a tire with good puncture resistance, decent tread life and a smooth ride. Saving 40 grams a tire doesn't appeal to me if I have to compromise on either of these. Today I carried 1200 grams of water and sport drink on my ride, so saving 80 grams isn't that big a deal.
By handling, not sure if you're talking about grip, or steering response. Certainly grip is important for cornering and braking. I didn't mention it because I haven't noticed any big difference in grip on the tires I've used. I'm sure there would be measureable differences on a skid pad, but it's not something I care to investigate on the road!artmichalek said:I'd also throw in handling at the top of the list. It doesn't matter how low your weight or rolling resistance is if you're face down in a ditch.
Not necessarily true. Rolling resistance depends also on tire width. A wider tire (up to a point) with equal PSI will generally roll easier than a narrower but identical tire, because there is less sidewall deflection, and hence less friction - not because of "more flexible tire walls".ajo said:The lightest will roll fastest, thinner, more flexible tire walls runs faster.
Higher PSI gives higher roller restance on normal roads, approx 110 it the ideal (fastest). Very high PSI is only fastest on real smooth surfaces = wooden velodromes.
My experience has been that narrow tires with stiff casings just bounce all over the place if anything gets underneath them. I'm not sure if the more suple tires have a better coefficient of friction, but it doesn't matter how sticky the rubber is if it's not touching the road.dhk said:By handling, not sure if you're talking about grip, or steering response. Certainly grip is important for cornering and braking. I didn't mention it because I haven't noticed any big difference in grip on the tires I've used. I'm sure there would be measureable differences on a skid pad, but it's not something I care to investigate on the road!
mark sills said:Try to figure out what is more important...a light tire (say 200 grams) that is good to 110 psi or a 240 gram tire good to 145 psi. Is there a method to calculate the tradeoff?
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