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Can't center rear wheel, rear triangle wider on gear side(8 posts)

Can't center rear wheel, rear triangle wider on gear sidesurf
Dec 24, 2001 8:11 AM
I am buying a bike for my sister that has this problem. Just an entry bike with a 7 speed freewheel. for some reason the right side triangle (with the freewheel) sticks out a bit more (to the right side of the bike). To get the Wheel straight, i have to move it to the left side just a bit so its not perfectly in-line with the front wheel. The ride is great though and i cant tell the difference when i test ride the bike. Any thoughts on this??? Is it purposeful or is there something wrong with the frame. Like i said, it does ride nicely???? Should I buy it?
re: Can't center rear wheel, rear triangle wider on gear sidesprockets
Dec 24, 2001 11:36 AM
If I hear you right, the frame is out of alignment. Some bikes can easily be manhanded back into perfect alignment. Ask a shop about the specifics of the bike-make, model, tube material, tube connection technology (weld, bond, braze) and see what they think.
re: Can't center rear wheel, rear triangle wider on gear sidegtx
Dec 24, 2001 11:50 AM
if it's steel you may be able to tweak it back, but if it's AL all you can do is file the dropouts. But make sure the wheel isn't out of dish first.
re: Can't center rear wheel, rear triangle wider on gear sideKStone
Dec 24, 2001 12:21 PM
Don't expect perfection with an 'economic' bike. If the bike shifts ok and tracks straight whatelse is needed?

Assuming the wheel is dished correctly and the wheel is parallel to the front wheel, just offset, move some axel spacers from one side to the other to 'center' the wheel.

If the wheel is canted (not parallel) then filing the drop out slot will straighten out the wheel.
re: centering rear wheelguido
Dec 24, 2001 2:49 PM
I can't believe "the ride is great" if the rear wheel doesn't track the front wheel. I bet you can't take your hands off the handlebars. If you do, the front wheel will flop side to side.

If the bike has dropout adjusting screws, you've got it made. Adjust one side or the other to align the wheel to track the front wheel. With both wheels spinning in the same plane, you can take your hands off the handlebars and the bike will go straight ahead, actually stabilized by, in effect, two gyroscopes.

I check alignment by running a straight edge along both rims. You can also use a string. If it touches each rim in two places, both wheels are tracking in the same plane. The ride will be sweet, even if the rear wheel is not perfectly centered between the chainstays.

If the rear wheel won't align with the front, it's probably out of dish, that is, the rim is not centered between the dropouts.
Wheel dish or bent frameKerry Irons
Dec 24, 2001 3:26 PM
How do you know the frame "sticks out a bit more" on the right? Did you measure it, or do you conclude that because the rim is too far to the right relative to the seat tube/BB/brake bridge? String some fishing line tightly from each drop out and around the head tube. If the line on both sides is equi-distant from the seat tube, then it is likely the wheel. If the right hand string is farther from the seat tube, the frame is bent. Another check is to put the wheel in "backwards" - reversed left for right. If the wheel is properly dished, it will end up in the same place (relative to the seat tube/BB/brake bridge) either way. If the wheel is off in both normal and reversed, the frame is bent. Don't buy a bent frame.
Agreenee Spoke Wrench
Dec 25, 2001 6:31 AM
I think I'd just look for another bike. Kerry said he wouldn't buy a bike that he knew had a bent frame. I wouldn't either. I also wouldn't bet on being able to redish that rear wheel either, and I do a fair amount of wheel work. The soft aluminum rims on low end bikes makes it hard to get enough tension on the drive side spokes.

I don't see any reason to buy something that you know has problems. There are lots of bikes out there that don't have bent frames or misdished wheels. Buy one of them.
pass on this piece of junk nmDAC
Dec 25, 2001 7:51 AM