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  1. 28’s?? That’s pushing it. They are a little knobby which is good but I ran 32’s (not knobby) and that was okay. There’s lots of rocks and tree roots you have to avoid but I was lucky in that it wasn’t wet. I’ve heard it can be a mess after rains.
    My road bike has 28’s, my touring has 32’s. GAP trail would be fine for 28’s but I personally wouldn’t trust 28’s.

    Maybe you’d be fine but I wouldn’t be comfortable with that.

  2. That seems like a good choice. Most of the towpath is compacted crushed gravel nowadays. You’ll have no problems there. Near DC (miles 27 to 1 IIRC), it’s rock-studded dirt, so you will want lower tire pressure and bigger tires. The need for good dirt traction is not totally critical, as the trail is mostly totally straight. The only way you can really go wrong while riding the Towpath in Spring, Summer, or Fall is slick tires under 32c.

    See also r/towpath for other discussion.

  3. Twentysix2 on

    I just rode from DC to PGH and ran a set of Almotion in 700 x 38c and they were fantastic,  even after lots of rain.  28 x2″ should be good also, with the wider tire more comfortable on the few rougher stretches

  4. They should be adequate in a larger size. As others have said near DC and Great falls area is pretty rough chunky stuff. The rest of the towpath I’ve ridden when it was relatively dry on my roadbike with 25c gp5000s it’s not bad at all. There’s even a 15ish mile stretch you can do on the western Maryland rail trail that’s paved.

  5. We came across a woman doing it on 25mm road tires… you’ll be fine. I did it on 38s and there were a few sandpits I had to walk through, but that was about it.

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