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I was on a group ride today and notice some very bad front wheel shimmy under braking on a long downhill at 30+ mph it still persisted even when I slowed to 20 an 15. I had just done a similar downhill 20 minutes earlier with no brakes and didn't notice anything unusual, I also had no problems on the flats at 20+. Could this problem be loose front hub bearings or would it be most likely brake related as I haven't changed brake pads in ages or maybe a caliper issue? Just curious on this one, don't want to go through it again.
 

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It's not shimmy

Rot Wiess Essen said:
I was on a group ride today and notice some very bad front wheel shimmy under braking on a long downhill at 30+ mph it still persisted even when I slowed to 20 an 15. I had just done a similar downhill 20 minutes earlier with no brakes and didn't notice anything unusual, I also had no problems on the flats at 20+. Could this problem be loose front hub bearings or would it be most likely brake related as I haven't changed brake pads in ages or maybe a caliper issue? Just curious on this one, don't want to go through it again.
Shimmy is when your frame goes into oscilation while coasting, typically down hill at high speed. If you're getting shudder while braking, then there is a problem with your rims, brake pads, or a weak fork. If your rims are smooth (no bumps) then consider cleaning them with a ScotchBrite pad. Also, scrub your brake pads with sandpaper. If your forks are flexy, they might shudder even with clean rims and good brake pads.
 
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