Old 08-18-14, 04:57 PM
  #29  
SquidPuppet
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Originally Posted by garage sale GT
You seem to think deformation percent and rolling resistance are the same.
No no. We agree on that. Thay are connected, but not the same.

If the tire is larger and deforms the same percent, it is deforming more rubber.
The narrower tire can withstand a greater percentage of deformation than the wider tire to have the same rolling resistance.
Agreed. Thats why I said ~15%. Meaning "give or take" a very small amount.

it will have the same rolling resistance at 20 or 25% as the wide one will at 15%
If we are still comparing a 35mm to a 50mm tire it will be far less extreme. If a 35mm tire is at 15% deformation, I'd wager the 50mm tire would need to be at ~13% to achieve the same rolling resistance. We are only talking about 2.25mms deformational difference at 15%.

It will probably still be at a higher PSI.
Yes. And in the 35 vs 50 scenario, it would be significantly greater. I weigh 165lbs and the 50mm Kojak is a solid pice of granite at 50psi. The 35 is noticably cushy at 80.

The ride just doesn't get that bad with a narrow tire at high PSI because it can deform easier than a wide one at high pressure, especially over lengthwise cracks or bumps.
Confused on that one. Why would the wide tire be at a high pressure? It needn't be.

Last edited by SquidPuppet; 08-18-14 at 05:01 PM.
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