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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-23-06, 11:54 AM   #1
jimmat
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krimped down tube

I hit my front end hard destroying the fork and crimping the down tube, the frame looks straight but there is about a 1/2 inch perpendicular "fold" in the down tube, not very deep but more that noticable. I wonder is it safe? or trash? Oh, its a steel frame.
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Old 05-23-06, 11:57 AM   #2
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My roommate hit a parked car (think he was drunk). His down tube has a smushed fold in it. No cracks but I'm sure they will develop in a day or two. Anyway I convinced him to not ride it and just ride one of my bikes to his work.
If you were my roommate I would do the same.
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Old 05-23-06, 12:03 PM   #3
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trashed. Don't ride it, because even if you put a new fork on there, the head angle has been steepened by the impact and you will potentially have bad toe overlap, not to mention a weakened frame.
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Old 05-23-06, 12:05 PM   #4
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1/2 inch sounds pretty drastic.
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Old 05-23-06, 12:07 PM   #5
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Any change in the shape of any frame will have me saying: DONT RIDE IT

except for deliberate safe changes like cold setting steel.
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Old 05-23-06, 12:28 PM   #6
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if you value your teeth don't ride it
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Old 05-23-06, 12:49 PM   #7
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I wouldn't bet my life on it, but I'd guess that it won't break unless you have another dramatic crash. It would probably suck to ride with that super-steep head angle though.
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Old 05-23-06, 04:00 PM   #8
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Had a friend do a similar thing about 6 months ago. He took a frame straigtener to it bent it back out and while there is a noticible bump where the fold was, its still bein messed on today. Steel is real (and fairly well malleable).
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Old 05-23-06, 04:11 PM   #9
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I rode a frame with a crimped downtube for about 4-5 months (courier work as well) until it snapped at the top of the seattube. Frame wasn't straight and as soon as I removed the seatpost the tube *pinged* out sideways!
Front end was much, much steeper and increased toe overlap dramatically, only one foot got wet when it rained, etc. etc all the obvious effects.

Would I do it again? Probably not.

If you love the frame try repairing it. If not, try to get another frame as soon as...
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Old 05-23-06, 05:12 PM   #10
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Quote:
Originally Posted by baxtefer
if you value your teeth don't ride it
+1

for the price of one root canal, post, and crown, you can get a custom steel frame made.
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Old 05-24-06, 02:43 AM   #11
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I'd get it checked out by a compotent frame builder and see what they say. Like many folks I rode a seriously dented frame for months but really didn't have too much confidence in it, which definitely made my life less fun.

After the crash, my head tube was twisted as well and it made the whole bike track strangely. Finally got it repaired and it turned out that some of the lugs had cracked as well (weren't visible) so was pretty glad about that.

The best thing you can do is get it checked out and then make a decision about leaving it and riding as is, repairing or replacing.

Failing that, post some pictures, and we'll all give our 'expert' opinion on yer dent.
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