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Old 09-18-06, 07:28 PM   #1
jim p
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Fork Straightening

The fork on my peugeot carbolite 103 is now twisted by about 5 to 10 degrees. Can I use the 2x4 pine boards and just twist the fork back straight? I am thinking about clamping the bottom of the fork so it can't move and then bolting a couple of 2x4's together at the top of the fork and then twisting everything back straight.

The reason that I am wanting to do all this work is because the quil stem is 22.0 mm in diameter and the replacement fork will be 22.2mm inside diameter. If everything will work fine with the larger replacement fork then I might be better off just getting a new fork.

If I go the new fork route I am guessing that I will need to cut it to the correct length since it will not be an original part.

This bike is not worth a lot so I don't want to spend much repairing it. If you fellows have any ideas about what I need to do, please let me know.
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Old 09-18-06, 07:35 PM   #2
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You could possibly bend it back to a reasonable condition...but I wouldn't recommend it...any kind of failure could cause a bad accident. I'd pitch it.
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Old 09-19-06, 01:36 PM   #3
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Well I deciced to go high tech. I used plywood instead of 2x4's and the fork bent right back into shape. The metal was soft and it took very little force to get things back in shape.
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Old 09-19-06, 04:37 PM   #4
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Quote:
Originally Posted by jim p
Well I deciced to go high tech. I used plywood instead of 2x4's and the fork bent right back into shape. The metal was soft and it took very little force to get things back in shape.
Bending a fork is not recommended, the problem is, that if the fork fails, you will do a face plant Note, I didn't say you may do a face plant, but you will do a face plant.

If you wanna know what a face plant is like, check out my blog, because I did one off my mountain bike April 11th, it was June 15th before I could ride again, and I got off lucky And yes, my shoulder is still bothering me, some days. I am also thankful, that my Provincial Health Plan (I am in Canada), paid for the CTScan, MRI and EMG, and all the doctor visits.

A fork that has been bent several times, is more likely to fail then one that hasn't. Best solution is to replace the fork, you may also need a different stem if the size is slightly different....
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Old 09-19-06, 05:25 PM   #5
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I'd get a new fork, or it may even be cheaper to pickup a complete beater frame instead. It's probably not a good idea (re: your face) to ride around too much on a rebent fork.
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Old 09-19-06, 05:26 PM   #6
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Bent fork = dumpster. Fork bent back into shape... well, I am not so adventurous. You need to check for any cracking, wrinkles or deformations in the metal. Fatigue cracks appear near joins, such as at the crown. Check closely there. You might also have a bent steer tube. Just how did the malformation occur in the first place?
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Old 09-19-06, 08:51 PM   #7
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Thanks for the warnings. I will definately take it easy on the fork for a while to see how it is going to hold up. The metal in the fork seemed to be very soft judging by how easy it was to bend it back into shape.

The original bend occured when a dog took me out and I did a face plant. I fought the bike all the way to the pavement and I felt the front wheel turn sideways and jerk on the way down. That was probably when the fork bent.

This is a steel luged bike and I think that all the bend was in the lug at the top of the fork and the drop outs at the bottom of the fork. It was a small bend and I did not notice any cracked paint or wrinkles anywhere. I will definately keep a watch on this fork and if I notice any twisting or bending under normal use I will scrap the fork.
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Old 09-19-06, 09:41 PM   #8
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Hmmmm.... frankly, the forced impact in the first place doesn't sound good. Really, I would dump it. No matter how much close attention you pay to it, things like this have a habit of turning to crap when you least expect it; like dogs running out at you.
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