The Velodrome

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alex

2:56 AM

quiet again

no one got any broken bikes?

ok, I'll go

I've a vibration at about 65kmh

very disconcerting, I thought it was the ass saver, but I've pulled that off and it persists

frame, wheels, bearings all seems solid

wheel balance?

going to pull the rear hub apart and relube the freehub, check the bearings closely

5 hours later…

gschenk

8:26 AM

Tracking?

Head set bearings? Upper and lower pressed in races concentric and in parallel planes?

It might be characteristic of the frame itself?

Lastly, perhaps the tyres are not offering enough damping of lateral motion.

Criggie

8:48 AM

alex: 65 km/h is impressive!
Hang the bike up and spin the wheels hard. Look/listen for balance issues (wuh wuh wuh wuh) A balanced bare wheel will be out of balance when you put a tube on it, because of the valve. So fit wheel weights or spoke reflectors to balance it.

Can you put your leg against the frame top tube while it vibrates while riding? I assume you're coasting in an aero posture ?

@alex are you on the hoods or drops? Or is it a MTB ?

alex

9:11 AM

drops, downhill

never used to do it, somethings changed

not a major wobble, but a buzz in the rear triangle, somewhere

integrated head set, and the it feels well rear of there anyway

might whip that out for a clean anyway

happens at assorted pressures

Criggie

9:23 AM