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Old 06-04-12, 08:57 AM
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You need the largest you can find, and that will be too small.
Trek do MTBs up to 23" size. The critical dimension isn't the "size" of 23" but the horizontal reach from saddle to handlebars. Compare bike sizes using the online geometry charts and look for "top tube" or "effective top tube" dimensions.
For Trek 23" this is 26.1"
For Giant XL it is 25"

You should also consider the largest wheel size. Normal 26" MTB wheels are tiny in a frame this size. Fortunately, you can get larger 29" (29er) wheels which are perfect for big guys.

You should also look for a frame with threaded eyelets for fitrting a luggage rack and fenders. Allows the bike to be used for commuting and touring.
I dont know if anyone makes bigger than Trek in their 29er range. Ask in the Clydsdale forum.
MichaelW is offline