Thread: 25s vs. 23s
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Old 02-15-19, 09:09 AM
  #16  
jimincalif
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Bikes: '96 Trek 850, '08 Specialized Roubaix Comp, '18 Niner RLT RDO

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Hysteresis. Riding a smooth velodrome track or rollers, thin tires at high pressure are fast. Take them out on real roads and the rough ride translates to lots of lost energy from bouncing your body up and down. Smoothing out the ride reduces those energy losses. I run 25s on my older bike, on 23mm wide rims they measure 28 inflated. My newer bike with discs, Iím running 30s on 28.4mm rims, they measure 31.5 inflated. More comfort is an added bonus.
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