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  1. #1
    meb
    meb is offline
    Senior Member meb's Avatar
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    Matching Shim/collar on a Trail-A-Bike to a 25.4 seatpost

    I picked up a used Trail-A-Bike. The seatpost collar that came with it is for a 27.2 seatpost. Should I get a shim to make up the gap or is collar with a shim inside too many seperate loose items? Or is it necessary to get a single shim/collar to safely cover the entire gap-it looks like the diameter might be 30+mm on without the existing collar.

    My best mountain bike and best road bike each use a 27.2, but I'd rather user lesser quality bikes when towing.

  2. #2
    Senior Member DieselDan's Avatar
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    I'm assuming you have an Adams. You should have the correct shim, or else it will wobble excessively. You can order a shim kit from a bike shop or online retailer. The hack way is to cut the existing shim. You'll need a vise and hacksaw to do this, and patience, as you cut the shim longways.

    While you're at it, tighten down the two bolts at the universal joint to stop wobbling.
    Bikes use brakes to stop.

    If your bike has breaks, don't ride it.

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