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Old 08-20-08, 08:27 PM   #1
deburn
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Problems with Trail a Bike

Hi everyone! First of all I want to say that my son and I did our first ride on a Trail a Bike last week and it was a blast - he loved it! Actually the first time he liked it, second time he was ecstatic and pedaling much more and now that's his favorite activity.

I love it because I get to cycle with my son (he's 4 and just starting to ride his own bike with training wheels) and it's not as hard as I thought it might be, esp when he's pedaling.

so all is well till I switch the traila bike from one bike to another and now he says the TAB leans to one side, which he also says didnt happen earlier. I have turned around a few times and saw that the TAB was tilted but i hadnt turned around with the first set up so I dont know if it looks different from what it was earlier.

I may have done something wrong when switching it over, but the only thing I can think of is that the link is now upside down. It doesnt seem likely (to me anyway) that that's the reason but before I fiddle with it I thought I'd ask you guys. The other change is that the first bike is a mtn bike and the second is a hybrid-type bike (old Shogun Ground Breaker - supposed to be a mountain bike but it's bigger than my old Raleigh mtn bike), so could the different angle be causing it?

When I searched this forum I saw that some people had problems with the link, but I didnt with the first set-up and now I do.

Any input and suggestions most appreciated! Thanks!

Bernard
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Old 08-21-08, 08:33 AM   #2
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The shim is the wrong size for the second bike.
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Old 08-21-08, 08:58 AM   #3
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The shim is the wrong size for the second bike.
By shim do you mean the white plastic thing that goes around the seat tube. (the metal part of the link goes around the white plastic part)

If that is the shim, then I have another one that came with the bike (I bought it off CL). Should I just swap the one I have on now for the other? Thanks!
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Old 08-21-08, 02:15 PM   #4
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Yeah the whiet part is the shim. I think our t-a-b came w/ 3 different sizes. You need a shim for the 2nd bike that is smaller than the one for the 1st bike, it sounds like. They might have their inside diameter stamped onto them somewhere, see if you can find that.
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Old 08-21-08, 09:40 PM   #5
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You guys are pretty good to be able to diagnose a problem without seeing it! I checked the bike this morning and the metal link had slipped off the shim completely! Now I can't find the other one I got when I bought the TAB! Well, worst case I'll put it back on the first bike, for now anyway - I have my son this weekend and I'm sure he's looking forward to riding it.

Thanks!
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Old 08-22-08, 01:13 PM   #6
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I cant find the shim and I may not have time to swap bikes before I pick up my son this afternoon. I was wondering if I lowered the seat as much as it would go, would that hold the link in place? I mean there would be no place for the shim to slip out.

Not as a long-term solution but would that work for an hour or so of riding?

Thanks!
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Old 08-22-08, 06:46 PM   #7
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Just wanted to say that I went with the seat all the way down and there werent any problems. It was just a couple of inches lower than I normally have it, so the fit seemed okay
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Old 08-26-08, 05:03 PM   #8
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If your shims are anything like mine, there is a small lip, that part goes on the bottom, so the coupler doesn't slip off the shim. Double check yours. If there's any play on the part that bolts to your seatpost, it's either not tight enough, or your shim is too small. Either of those can cause a major accident (his bike can come off and really injure him, or your seat post can break.) Listing can also come from the U joints on the bike being worn out, or not fully tightened. The bike should have very little side to side play if it's working safely. The U joints should be stiff, but able to be moved by hand, apply a little chain lube to the joint (not WD-40) to extend it's life.
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Old 08-26-08, 07:20 PM   #9
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If your shims are anything like mine, there is a small lip, that part goes on the bottom, so the coupler doesn't slip off the shim. Double check yours. If there's any play on the part that bolts to your seatpost, it's either not tight enough, or your shim is too small. Either of those can cause a major accident (his bike can come off and really injure him, or your seat post can break.) Listing can also come from the U joints on the bike being worn out, or not fully tightened. The bike should have very little side to side play if it's working safely. The U joints should be stiff, but able to be moved by hand, apply a little chain lube to the joint (not WD-40) to extend it's life.
Thanks for the heads up on the accident potential MP (great handle! would love to hear the story behind that one!). I'm moving this week but will definitely check it out over the weekend. Are the shims commonly available at the LBSs?
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Old 08-26-08, 08:47 PM   #10
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If they sell the bikes, I'd think so. You'd more then likely need to buy them as a set with the clamp for attaching them to a second bike. Came with 3 shims and the clam if I remember right. Adam's trail-a-bike is very popular (for good reason) so it shouldn't be too hard.
Thanks for the nick compliment, origin is pretty boring, I'm a couch potato that plays military video games.
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Old 08-27-08, 01:02 PM   #11
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If they sell the bikes, I'd think so. You'd more then likely need to buy them as a set with the clamp for attaching them to a second bike. Came with 3 shims and the clam if I remember right. Adam's trail-a-bike is very popular (for good reason) so it shouldn't be too hard.
Thanks for the nick compliment, origin is pretty boring, I'm a couch potato that plays military video games.
That's funny!
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