Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This question already has an answer here:

Will a 26x1.50 or 26x1.25 slick fit on a rim that I now have with a measure on the tire 26x2.00 and the rims I have are 26inch bontrager AT-550?

share|improve this question

marked as duplicate by jimirings, Benzo, freiheit Mar 17 '14 at 0:58

This question was marked as an exact duplicate of an existing question.

Compare the metric dimensions (stamped on the sidewalls) of the old and new tires. A 26" tire will have a measurement such as 40-571, indicating tire width and rim diameter. The second (larger) number needs to match between the two tires, the first does not. (Unfortunately, "26-inch" rims vary in diameter by about half an inch, from one style to the next.) As to width, the tire width should generally not be narrower than the outside width of the rim. – Daniel R Hicks Mar 9 '14 at 13:12

The Bontrager AT-550 rim is a standard 26" mountain bike rim. A typical MTB 26" tire, including the narrower 1.25" should fit, yes.

You should compare the bead diameter on the original tire to the new tire. it's the three digit number on the tire that matters. Usually, for these tires, it would be 559mm.

You should make sure that the tire width is a minimum of 1/8" or 5mm wider than the width of the rim.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.