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Old Jan 27th, 2012, 7:46 am   #1 (permalink)
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Question Straightening rear subframe

I posted this in Supersport, but I thought there may be even more experience crashing here . My track SS has a bent rear subframe that I'd like to get straightend. The suggestions I have so far are: send the frame to framestraightsystem.com, try to bend it back with a 2x6, take to auto body shop, which should be able to help. The rear subframe is welded to the main frame on an SS. Any options would be appreciated (I don't want to replace the frame due to titling issues). TIA!
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Old Jan 27th, 2012, 8:42 am   #2 (permalink)
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If you have some way of taking measurements that are consistently repeatable, and can hold the frame securely, you could do it yourself with the aforementioned lumber.

You could try an autobody shop but I have my doubts about them because of their lack of experience. Might be worth a call or two.

Framestraighteners or another similar place would be the best bet. But, if it were my track bike, the first thing I'd do after getting it back would be to cut off the subframe. Then weld on mounting brackets and mod the ends of the subframe to suit. Finally, I'd use shear pins to attach it so that the next time you take a tumble, the pins break and nothing (back there) gets bent again.

The same type of system was used on the Indycars I worked on years ago for the rear wing (still is). They were mounted to the gearbox case and in a crash, you'd destroy the case. Somewhere along the way, somebody got smart and mounted shear plates to the gearbox from which the wing would then mount. Impact breaks the plate (cheap) instead of gearbox case (in no way, shape, or form cheap).
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Old Jan 27th, 2012, 9:31 am   #3 (permalink)
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Without knowing where is bent my first suggestion would be cut and weld. Buy another frame, maybe damaged in a different area, cut the section you need and weld it to the front section.
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