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Is my frame bent????(6 posts)

Is my frame bent????burhed
Aug 16, 2003 2:26 PM
I need a little help in this initial diagnosis. Lately my bike seems rather uncomfortable. If I ride no handed it seems to want to pull to the right. I've even had a little bit of knee pain. I've checked my cleats and everything obvious but still the same.

So today I decided to see if maybe my frame is bent. Now I have no experience in checking for such a thing, so feel free to tell me I did this all wrong. I took a piece of thread with a small nut tied to one end. With the seat and rear wheel off I put the bike on a trainer. I set the thread so it was in the middle of the seat tube and let the nut drop between the chainstays. As you can see in the attached pic it is definately not in the middle of the chainstays. It's about a whole centimeter to the left. I made sure the bike was level, as you can see, and it's not "smashed" into the trainer, just resting on the trainer.

Anybody have any sugestions? Is my frame toast? Will Specialized cover a warranty? Is there another way I could check it? The bike has never been crashed other than the typical "couldn't get my foot out at the stop light tip over". Thanks for your help.
re: Is my frame bent????twobits
Aug 16, 2003 3:32 PM
the frame alignment tools at your lbs should be better able to help you. if they know how to use them....also check out sheldon browns website for frame alignment.
re: Is my frame bent????_jim_
Aug 17, 2003 2:43 AM
hello specialized, yeah I was _just riding along_ when my frame bent itself
How do you know your holding the frame level?LC
Aug 16, 2003 4:52 PM
I doubt it is bent, but maybe manufactured poorly.
Better checking method...Nessism
Aug 16, 2003 9:18 PM
Quick and dirty frame alignment method:

- Take a string and attach it to the inside surface of one rear dropout

- Wrap the string up around the head tube and back to the other dropout

- Make sure the string is not hanging up on any components or cables

- Take a ruler and measure from the side of your seat tube over to the string on both sides.

The measurement should be the same if the frame is straight. A deviation of more than 2 mm is not good.

Good luck.

Ed
flip the rear wheelKerry Irons
Aug 17, 2003 4:09 PM
If it remains centered in the frame regardless of whether the cogs are on the right or the left, then your frame is square. You could just be looking at a very slight mis-placement of your hang point for the thread here. Or it could be the frame is lop sided, but you're really more worried if it is square at the dropouts, thus the wheel test.