Ran into a curb
09-13-18 | 10:02 PM
#1
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Ran into a curb
Low night vision I rammed into a thick road curb on my MTB. Subsequent to that I noticed the disc was rubbing and making an obvious noise on every rotation. How would ramming into a curb cause my brake disc to get pushed over to one side so that it was rubbing? The wheel and brake disc both look quite true. What damage would you expect when running into a curb on an MTB?
09-13-18 | 10:17 PM
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Bent main frame or fork, shifted ft axle in fork are the biggies that might cause a rubbing brake. There are other possibilities, severe impacts can cause odd kinds of results. Usually there's more then just one problem with significant impacts, like a curb at pace. I suggest you have a qualified someone take a look. Most shops will give an initial verbal assessment at no cost. If there's aluminum materials involved do this sooner then later. Andy
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09-13-18 | 10:23 PM
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Bent main frame or fork, shifted ft axle in fork are the biggies that might cause a rubbing brake. There are other possibilities, severe impacts can cause odd kinds of results. Usually there's more then just one problem with significant impacts, like a curb at pace. I suggest you have a qualified someone take a look. Most shops will give an initial verbal assessment at no cost. If there's aluminum materials involved do this sooner then later. Andy
I believe my fork is magnesium alloy. It's pretty big and beefy.
Last edited by RowdyTI; 09-13-18 at 10:41 PM.
09-13-18 | 11:23 PM
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Update. The wheel is closer to the left leg of the fork than to the right leg. Is this normal? That means to say that when you are on the bike, the wheel is closer to the side with the brake disc. I should add it's minor but noticeable enough because I stuck an object between the wheel and the fork on one side and it went smoothly through on that side. On the other side, it was too tight to slide through. So there's a difference.
Last edited by RowdyTI; 09-13-18 at 11:48 PM.
09-14-18 | 03:42 AM
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From: Saulkrasti, Latvia
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Update. The wheel is closer to the left leg of the fork than to the right leg. Is this normal? That means to say that when you are on the bike, the wheel is closer to the side with the brake disc. I should add it's minor but noticeable enough because I stuck an object between the wheel and the fork on one side and it went smoothly through on that side. On the other side, it was too tight to slide through. So there's a difference.
P.S. If realigning the wheel does work, you'll probably need to realign the brake caliper as well.
09-14-18 | 07:48 AM
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If you don't have a thru-axle, it could be that the impact caused the wheel to slip in the dropouts, moving it off center, and that would cause also the brake disc to rub. If releasing the QR and realigning the wheel still makes it sit off center, the fork might be slightly bent, as was mentioned before. Another cause, in theory, might be the wheel being out of dish, but is unlikely to come from a single impact.
P.S. If realigning the wheel does work, you'll probably need to realign the brake caliper as well.
P.S. If realigning the wheel does work, you'll probably need to realign the brake caliper as well.
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Stuart Black
Dreamin' of Bemidji Down the Mississippi (in part)
Plan Epsilon Around Lake Michigan in the era of Covid
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
09-14-18 | 01:16 PM
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From: Llano Estacado
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Update. The wheel is closer to the left leg of the fork than to the right leg. Is this normal? That means to say that when you are on the bike, the wheel is closer to the side with the brake disc. I should add it's minor but noticeable enough because I stuck an object between the wheel and the fork on one side and it went smoothly through on that side. On the other side, it was too tight to slide through. So there's a difference.
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