Originally Posted by
Andy_K
I think the charts are conservative. I have often used wider tires than they recommend without any problems.
There's a trend these days to use wider rims with narrow tires, particularly 700x23 tires with rims that have a 23mm outside diameter. Typically, those charts would say that's a bad idea, but it's becoming a highly recommended configuration. I can only speculate as to how well that would translate to your rims and preferred tires.
Have you verified the 21mm inner width measurement yourself?
My impression was the numbers in those charts was the inner width of the rim, not outer. Is that not correct?
I am not clear what a 23mm outside width would translate to on inside width.
I haven't tried measuring the rim myself yet, though I could certainly try to do so, maybe this evening. I was assuming it was 21 mm inside width.
My concern isn't wider then the recommendation, as this seems to be quite common with MTB tires. My concern is narrower tires then recommended. I don't want to risk sidewall blowout or pinch flats.