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Tire width and gearing ?s...(3 posts)

Tire width and gearing ?s...Farmpunker
Oct 22, 2002 10:26 AM
Two unrelated questions.
First: does tire width affect standover? I'm guessing that with relatively equal tread, knob size, the wider the tire the larger the tire. Is this a dumb question? A 38 will reduce standover more than a 32, right?
Second. I'm running an Ultegra triple and an 27-12 (I think) rear. I know this isn't a cross setup, but why should I switch to a cross ring combo (other than the fact that I've yet to use the big ring in a race)? Is this affecting my ride, and how?
re: Tire width and gearing ?s...climbo
Oct 22, 2002 11:37 AM
1. Yes, it will change, BUT... Tyres are measured when round so the difference is small. Plus, it depends on what tyre pressure you have as to how much your tyres flatten out.

2. Unless you want to run a nice light cross specific set-up, a triple with that gearing will work. Most hard core crossers try to run drive trains that work well in muddy conditions, that's why single ring set ups are common. Also, double rings are usually closer together (36 to 48 range) as you don't need a 53 and you get better shifting.
re: Tire width and gearing ?s...atpjunkie
Oct 22, 2002 7:07 PM
superior shifting is the reason. just put a 50 on the outside and keep the triple. As far as tires my 35's affect standover more than my 32's, there is just "more tire" laterally and vertically