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Thread: Bent frame recommendations?
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04-18-2021, 09:20 AM #1
Bent frame recommendations?
A few weeks ago on a ride my 6yo daughter had some sort of a chain stuck incident which lodged her chain so hard that my wife was unable to get it unstuck. I came back to help and by that time it was obvious that the hanger was bent.
Yesterday I pulled the hanger but realized the damage was more significant and the rear dropout appears to be bent also. If I replace the hanger only I can only imagine that the shifting will suck. To continue using the bike with any success I think I need to bend the dropout.
Frame is an aluminum Canondale Cujo 20+ from 4ish years ago. Should i:
Bend away (eyeball it)?
Take it to the LBS (was an REI purchase)?
Call Canondale?
Can't seem to find just a frame - especially in this current supply debacle - and there is a little brother who will be inheriting this in a year or two.
Thanks for the help!
Seth
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04-18-2021, 10:14 AM #2
That doesn't appear to be super bad. I'd use a long bolt with a couple of nuts to make a pry bar on the dropout and tweak it back until it looked reasonably straight.
Then I'd user a hanger alignment tool to get the actual hanger straight.
*that all comes with the caveat that cold forging aluminum isn't a great solution and you should definitely check carefully for cracks, both before and after the bending. But... it's a kid's bike. It's not getting sent by a 250lb dude. It'll be fine.
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04-18-2021, 10:18 AM #3
Yup, 10-12” Crescent wrench should fix that right up fairly easily.
But what he said about aluminum.Forum Cross Pollinator, gratuitously strident
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04-18-2021, 10:22 AM #4Registered User
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It doesnt look very bad but a good question to ask is does the frame really need to bent back, can you make it work by adj the hanger?
Lee Lau - xxx-er is the laziest Asian canuck I know
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04-18-2021, 10:57 AM #5
Same as everyone has said, aluminum does not cold set (bend back) very well, it gets pretty brittle when bent.
1st step - Put on a new hanger and use a hanger alignment tool, if the hanger is properly aligned the hanger and derailleur wont know/care what angle the frame is at.
2nd step - see if the chain runs freely past the frame in the smallest cog, if there is no issues or interference, I wouldn't bend the frame at all.
3rd step - if you have chain rubbing issues, do a light bend of the frame.
This is the proper tool to adjust the dropouts, most "modern" shops wont have these tools:
Here is a good article on how to use them, and the theory of it.
https://www.parktool.com/blog/repair...pout-alignment
This tool/job can be replicated with 10mm (3/8) threaded rod/bolts and nuts.
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04-18-2021, 04:26 PM #6
Thanks all!
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04-18-2021, 09:53 PM #7
How did you get it sorted, if you have?
Forum Cross Pollinator, gratuitously strident
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