Quote:
Originally Posted by RacinNinja
130/60 is what was ZeroGravity posted here. 60% of 130 is 78. 98-78mm = 20mm. half of that is 10mm.
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She was wrong, it's 130/70. And you're unnecessarily halving that too - a 130/60 really has a 20mm shorter sidewall than a 140/70. The overall diameter would be 40mm shorter (627.8mm vs. 587.8mm including the 17" wheel).
http://www.invisibill.net/ninja/tirecalc/ for people who don't want to think about the math.
140*70% - 130*70% = 98-91 = 7mm. Or (140-130)*70% = 10*70% = 7mm.
The sidewall is 7mm taller, meaning the tire diameter is 14mm larger, and the rear axle would be raised 7mm (~1/4"). And yes, these are based on the tire size category numbers; different tire models will have slightly different measurements in reality.
That extra 1/4" will raise the seat a bit, and make the steering a bit twitchier. As stated, it's not going to drastically alter how the bike operates, but it will be slightly different, and that much harder for a short person to reach the ground.