I have a 2000 Trek XO1 that I am putting back together to ride / race and have fun on gravel. What's the max tire width this frame will accept. I will be using Avid shorty ultimate brakes. 

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Don't know the max but I saw where someone switched back and forth from 28c to 35c and said they still had ample clearance on that bike, same year..

Take your wheels off and measure like I did.
Shut Up Legs !
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