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  1. #1
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    Max tire width anyone has used on a Trek 520???

    I'm touring the C&O/GAP next month. I'm just wondering what is the largest tire anyone has put on a Trek 520. I'm thinking of trying the tour with a set of these in 37 mm.

    http://www.conti-online.com/generato...ontact_en.html

    or these in a 40 mm, folding bead.

    http://www.schwalbetires.com/marathon_dureme

    My 520 is a 1994 model. The inside of the front fork and chain stays both measure about 60mm at the top of the tires. Of course, things move and flex when you hit a bump.

    I have a set of Gilles-Berthoud fenders in a 40mm width which I would like to use, but might have to remove.

    Comments appreciated.

  2. #2
    totally louche Bekologist's Avatar
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    what's on there right now, and how much clearance do you have? add mms to within about 3 mm of the fender, and you have max width. Double check at chainstays, under fork, and at seatstays.

    the more recent treks had limitations at the fork clearance, but this clearance appeared to be improved on the last couple of years. in mid 2000s you couldn't usually get more than a 35 under the fork unless you filed down the steerer tube!
    "Evidence, anecdote and methodology all support planning for roadway bike traffic."

  3. #3
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    Quote Originally Posted by Monoborracho View Post
    Of course, things move and flex when you hit a bump.
    Really? Measurably?

    I run 37-622 (both Schwalbe XR and Schwalbe Supreme) on my 2009 Trek 520 with no problems.

    You can often run larger tires if you give up on having fenders.

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