The rim width of my 700c wheels is 25mm. I am therefore assuming these are hybrid wheels and require thicker tyres. Can anyone advise me whats the thinnest tyres I can fit onto my wheels?
Thanks for the replies. @ nfmisso, the outside width of the rim is 25mm n the inside width is 19mm. So is it generally the case that if the outside width of the rim is 25mm, then a 25mm tyre n above should fit that rim? If i was to go one tyre size lower than 25mm, is there some chance it could fit that same 25mm rim or would that be pushing it?
You have to measure the inside width; no two models of rims have exactly the same side thickness. No generalizations are possible or reliable in this area.
Unfortunately, I don't think there is a single, correct answer to this. It depends on rim shape, width, how tight the particular tires fit, how close they are to their listed size (this actually varies a lot), etc.
As a general rule, I wouldn't go narrower than the outside width of the rim. I've seen people do it, but it's a little sketchy. If the tire is sloping inward at the point it exits the rim, I don't think there's any way your getting good engagement between the bead of the tire and the lip on the rim. Matching rim and tire width is probably fine, but I don't think anyone can say that absolutely.
Again, I think the bigger question is what you're trying to achieve. If it's the narrow tire look, there's only so much you can do. If it's speed/performance, I'd worry more about find good quality, fast tires than trying to find the narrowest tire you can get away with. 23 vs. 25 is going to have little to no impact compared to what kind of tire it is.
Thanks for the replies i think i will try a 28mm tyre which should fit the 25mm rim ok.