I would have thought that this would have been discussed in much detail already, but I could not find any solid reference to the topic at hand: How does rim width correlate to tyre width? Is there any concrete limits for certain widths at all, or does it differ from one rim/tyre combination to the next? Here's some context to that question; I have 26" Alex Rims DM18's (559x18) on my bike fitted with 26 x 2.25 Maxxis CrossMark UST Tubeless tekkies front and back. The previous owner of this bike did a lot of road riding with these tyres, and as a result, the rear is worn to a point where it does not provide the grip it's supposed to (on that note, these tyres don't appear very grippy even when new). This together with the fact that they've got a bunch of dry sludge in and showing some age cracks on the sidewalls prompted me to look for new tyres. Obviously, my first place to look was the hub. Lo and behold, a set of 26 x 2.4 Continental Mountain King II tyres, brand spanking new! Some quick searches suggest that fitting a 2.4 to a 18mm rim will not work so lekker. I thought I'd try and understand where my limits lie when looking for tyres for this rim. Aaaaand go!
