Was thinking about building a cyclocross bike out of an old road frame. The bike would be used to ride on road, and gravel trails. Would be used primarly for commuting. So with that being said I was thinking that 30-32mm tire would work good for gravel (crushed limestone)? I can't go too fat as it is an old road frame so the spacing in the seat & chain stays is a limiting factor. Are cyclocross rims and road rims the same as far as dimensions? Figured I could get away with road rims since I am just doing road & gravel road and not trying to hop logs or do obstacles. I would imagine road rims are not as strong as cyclocross rims. I would think cyclocross rims are made more for taking a good beating. Has anybody tried this before with success? Any suggestions would be appreciated.