RAGBRAI LI Route Announced on Jan. 27!

2011 Trek 7.5 fx – size?

Hi, all,

I am considering using my brother-in-law’s 2011 7.5 fx, but I can’t find the size on the frame. The bike looks small, and it needs some work, so I can’t take it out for a spin to better evaluate.

Does anyone know where the size is marked on this model, or which parts I should measure to figure this out?

I’m obviously not a super-experienced biker, so thanks for your patience!

7 Replies

Amanda, May 10, 2016 at 11:39 am

Try standing over the bike and see how far the bar is from your “parts”. I was told an inch clearance is about right. You can raise the seat if needed but only so far, of course. Hope this helps.


ghardeman, May 10, 2016 at 11:41 am

Broolan, My 7.2 FX has as a sticker on the seat tube showing the frame size. Alternately, you could measure from the center of the crank to the top of the seat tube clamp. This should give you the frame size. Here is a link to Trek’s current size chart. Sorry, I couldn’t find a 2011 chart. Should be the same.

Hope that helps.


ppayne1959, May 10, 2016 at 12:12 pm

Amanda is right. Unless you are trying to do a serious fit up as long as you can comfortably straddle the bike you are good. If it is a little small and you like the bike you can get a longer seat post and there are many stem configurations that you can buy to get to the fit you want. At one point however too small is too small.


KenH, May 10, 2016 at 2:02 pm

Given that RAGBRAI is a rather long ride it would make sense to take the bike to a good shop and have them do a proper fit for you. You’ll complain about the money at first but after 400 miles you’ll thank me!


Broolan, May 10, 2016 at 6:37 pm

Thanks, everyone! I really appreciate your input. I’m overthinking this and will take it in to my local shop for a tuneup (which it needs anyway) and see about the fit.

I had always used the inch-or-so clearance as my standard, but the top tube on this model seems to sit low. My Brother-in-law is a good 4 or 5 inches taller, and I couldn’t figure out why I would need a bigger bike than he does. :)

Thanks again, good Iowa folks (or honorary Iowans)!


jeffreydennis, May 10, 2016 at 6:54 pm

Yeah, the one inch rule doesn’t apply very often any more


HeyYou, May 13, 2016 at 11:40 am

Unless Trek has changed how they do things, the bike size should be stamped along with all the other information for the bike on the inside of the left rear drop.


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