Cracked Steering Tube
04-21-08, 09:51 AM
#1
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Cracked Steering Tube
Have you ever seen a bicycle snap off about half an inch into the headset above the fork? My girlfriend accidentally crashed her bike head-on into a well set wooden post and it cracked right off. Totally destroyed it. (She's fine other than a few scrapes and bruises)
I think it snapped due to being aluminum and a cheap department-store bicycle. I've never had that happen before.
I think it snapped due to being aluminum and a cheap department-store bicycle. I've never had that happen before.
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1980 Sekine RM-40 | 1990 Miyata 1000LT | 1980 Raleigh Sprite Mixte | 1979 Raleigh Grand Prix
1980 Sekine RM-40 | 1990 Miyata 1000LT | 1980 Raleigh Sprite Mixte | 1979 Raleigh Grand Prix
04-21-08, 09:59 AM
#2
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Usually only happens to forks with threaded steerers and a stem that's been raised above the minimum insertion/maximum extraction mark.
04-21-08, 10:55 AM
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i've seen that happen on a fork with a carbon steer tube. the damage wasn't even caused by a crash! he got on the bike, stood up and snapped the steer tube in two (just about 5 cm above the crown race). also, a too tight quill stem expander bolt might cause the seam of your steel steer tube to separate. That's another weird one, since the symptom will be a too tight headset when the wedge is torqued.
04-21-08, 12:41 PM
#4
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I guess I described it wrong... What was left was a fork that had only about a half-inch of steering tube, the rest was in the headset still, with the handlebars - it cracked near the bottom of the headset and dropped out.
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1980 Sekine RM-40 | 1990 Miyata 1000LT | 1980 Raleigh Sprite Mixte | 1979 Raleigh Grand Prix
1980 Sekine RM-40 | 1990 Miyata 1000LT | 1980 Raleigh Sprite Mixte | 1979 Raleigh Grand Prix
04-21-08, 11:39 PM
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Haven't seen that, but I did once have a BB axle snap. I put on the gas an the crank with the end of the axle just fell to the ground. Cheap wally mart bikes are made of pot metal not steel.
04-22-08, 06:28 PM
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George Hincapie, 2007 Paris-Roubaix.
04-22-08, 07:21 PM
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