Sorry if this has been covered before (and I'm sure it has) but,
I changed tires on my 2012 Trek DS 8.5 for the first time yesterday and measured the inside rim width. The inside width of the rim is 16mm and the tires the bike came with are 700x38 -- which seems like a mis-match to me.
When I bought the bike, I tried to get information on the Bontrager rims it came with but this model was not listed anywhere on their website -- which is why I had to resort to measuring with a tape measure. (Admittedly my measurement might be off -- it wouldn't be the first time).
But, according to everything I have seen or read, the width of the tire should be no more than 2x the inside width of the rim. I assumed that the tires the bike came with would be somewhere in the middle of what these rims should be able to safely handle. But, according to my measurement they are significantly wider.
... So, I am wondering: Did Trek screw up?
For me it is a moot question: with my new tires I dropped down to 700x35 -- which is just a little above the limit for the rims as I understand it and I am thinking I can push it that far. But Trek could have put ANY size rim and ANY size tire on there -- so it puzzles me that they would use a rim that was too small for the tire...
But part of the Trek advertising for the bike bragged that the bike had lots of wheel clearance and even implied it could run a 29're tire.
On the other hand, they also said it was "fender ready" -- but I had to replace the front derailer to get clearance for a rear fender...
... Am I missing something here? Or is Trek just not putting enough thought into the components they are combining?