Rubbing/grinding at speed

[Adam4868]

Put some wheels on my bike (mavic kysium) and descending at speed 30 ish mph it feels almost like brakes rubbing on rims,loud noise aswell.Ive let the brakes right off and tried it but the same.Any ideas what it could be ?
Tried in workstand and seems fine,cant replicate the noise.

 

[fossyant]

Weird. If rim is running true then even at slow speed no noise. Can you spin the wheels fast and see if replicated ? Other option is faulty freehub ?

 

[Milkfloat]

Are you putting the power in yourself or freewheeling?

 

[I like Skol]

Is this when pedalling, coasting or all the time?

Do the rims sit central in the chain stays? Have you used new tyres which may have molding sprues/hairs on them and could be brushing brakes or frame when at speed?

How do the hubs feel when the wheels are removed from the bike?

 

[Racing roadkill]

Check the cable end on the front mech isn’t catching the rim.

 

[Adam4868]

It's when freewheeling, definitely nothing catching.All fine in workstand.

 

[fossyant]

Check the cable end on the front mech isn’t catching the rim.

This... happens on my FS MTB - I had to tuck the front mech cable out of the way.

 

[Racing roadkill]

It sounds like the ‘Mavic growl’. It’s a typical issue with Mavic wheels. If they are brand new, it’s a warranty replacement job, if not, ( if you bought them second hand etc.) if it is the growl. the freehub is toast I’m afraid. You can re free hub them or get completely new wheels .

 

[Adam4868]

Yea there not new,I think it's the hub !

 

[boydj]

It sounds like the ‘Mavic growl’. It’s a typical issue with Mavic wheels. If they are brand new, it’s a warranty replacement job, if not, ( if you bought them second hand etc.) if it is the growl. the freehub is toast I’m afraid. You can re free hub them or get completely new wheels .

Not necessarily toast. I had the same with my Aksiums. Try lying the wheel flat and dribble some very light oil or GT85 onto the freehub and leave it to make its way inside for a while. This might be enough to soften the dried-up grease inside the hub and quieten things down a bit. It worked for me and 3 years later the wheels are still going strong on occasional outings.

 

[User6179]

This might be enough to soften the dried-up grease inside the hub

There shouldn't be any grease on the freehub, mineral oil only.

 

[twentysix by twentyfive]

I thought @Fnaar had written that thread title.

 

[mrandmrspoves]

I thought @Fnaar had written that thread title.

I too was disappointed to find the post was about bicycles.

 

[Adam4868]

Quick update for anyone who has "the Mavic squeel " Took bike to mechanic who promptly cleaned and re greased hub,good as new !
Great bike mechanic for anyone in the Fylde area,nothing is too much trouble.
Colin Gardner ( the bike magician) Kirkham.

 

[iluvmybike]

This is exactly the same problem we just had and we replaced the bearings and it seemed ok for one short ride. However, it started again during a 75 mile ride. We had to replace the freehub body. Instead of a normal cartridge bearing on the inner side there is a plastic bushing which cannot be obtained to replace it - over time this wears away and allows the freehub to rock which causes the outer bearing to start to wear & then you get the clanking, grating, screeching. It happens on these wheels. A new freehub body is about £45 and is easy enough to fit. There is a company in USA which makes a freehub body to fit which has a bearing instead of this plastic bushing.