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Frame bent?(5 posts)

Frame bent?nodima
Aug 1, 2001 4:25 AM
How does one check to see if a bike's frame is bent/out of alignment?

I have a 2000 Specialized Allez w/900 miles on it, and no crashes. My rear wheel has to be tweaked in order for it to rotate without rubbing. If I set it firmly in the dropouts and tighten the skewer, the wheel (tire) will be rubbing on the chainstay on the side opposite the cranks. I have to shift the wheel in the dropouts to enable it to spin freely, without rubbing either the frame or the brakes.

I had noticed this earlier in the year, but being new to roadbikes (MTB for 10 yrs), thought it might be "normal" to have to fine tune the rear wheel this way. I had the wheel rebuilt due to spoke breakage problems and the situation is still the same.

I suppose it could either be the frame, or even the hub, but I have no clue how to figure it out.

Any Help is appreciated.

nodima
maybe, maybe notak
Aug 1, 2001 5:07 AM
could be a couple of things, some are fixable, some aren't
1) bent frame: can't be fixed, might be warantee
2) wheel dished wrong (rim is off center to the axle, builder's error): fixable and shouldn't cost you anything because it was just rebuilt.
3) dropouts bent or machined incorrectly: fixable and should be under your warantee. This damage is usually done during shipping and Specialized has a very good service dept, but they don't like to deal with customers directly. Go to your LBS and have them figure out what the problem is.
4) user error: go to LBS and they'll set you straight.

good luck with it
and the answer is...D'Ohhh!!!
Aug 1, 2001 5:29 AM
take bike to LBS. If you have no clue how to figure it out, do you really expect to learn how over the internet???
One other suggestionHorace Greeley
Aug 1, 2001 7:56 AM
I agree with most of the above, but FWIW there is an article in the recent issue of Bicycling about how to determine if your frame is bent. Some (or all) on this website may slam the mag, but the article seemed to make sense. If you haven't crashed and the frame is new, I'd be surprised its the fram and not something else. Good luck!
re: Frame bent?fuzzybunnies
Aug 1, 2001 8:02 AM
If you want to test if the stays are straight loop a piece of string around one dropout and run it up around the headtube and attach to the opposite dropout. Now check to make sure the distance from the seat tube to the string is equal on both sides. If there is a difference in the differences your rear frame is bent. This test is easiest to do if the frame has dropout screws to tye around. don't know of any easy test for the dropouts. TTFN