My trainer broke my bike. Oops

Equipment
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Or maybe there just wasn’t enough pressure on the drops? Not sure…it was a standard 5mm QR w/ 9mm dropouts. Derailleur hanger is secured by two hex-drive flathead M4x12 bolts. One of them sheared off in the hanger.

As you may guess by the fact that it’s a QR gravel bike, the bike is quite old but I managed to find a derailleur hanger on line. Or maybe found one on line. We’ll see when it gets here. As a backup I’ve got a 2mm left-hand twist drill bit on the way. Either way some bike wrenching to occupy my time in the near future.

Anybody else shear off a derailleur hanger bolt? Or any trainer-induced breakage stories/advice?

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Yep! I broke mine doing a 1100-1200 watt sprint a few years back.

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Nice “backdoor brag” there!!! :facepunch::facepunch:

:sunglasses:

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I had a bent mech hanger on my trainer/road bike and I’ve not crashed her so put it down to the wheel on trainer somehow but that’s about the extent of any damage (I hope).

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Not experienced it myself, but I have seen and read more than a couple of stories of bikes with open dropouts slipping out of trainers. It’s a good idea to check and reapply the QR once in a while. I check mine about every 2 weeks at least, when I lube my chain on the trainer bike.

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photos?

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image

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wowza - she ripped right off. do you ride to the far end of the cassette (high or low) or in the middle?

i want to make a comment that the dust / sand is responsible just to stir up a fierce debate…wait i just did

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I’m going with too much power :muscle: That’ll never happen to me :roll_eyes:

I have just had one of those hanger bolts retapped though.

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My hanger mounts the same way but I’ve never broken the bolts though they do loosen up ever so slightly over time. Another win for Di2 :upside_down_face:

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Nah. I’ve dropped about 12 kilos over the last several weeks so I’m working hard just to hold onto whatever meager power I had.

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