Oscillating Cassette?

laurentian

I store my Allez with 9sp Sora cassette on a rack.

Yesterday I gave the pedals a spin and let the rear wheel spin. Whilst it was free wheeling, I looked down towards the cassette from the crank with my eyes at cassette level.

When freewheeling, although it obviously doesn't spin, the cassette oscillates or "wobbles" from side to side about its axis - the chain moves accordingly.

Any ideas on what this could be and any possible remedy?

Thanks in advance

schweiz

if it's wobbling about its axis like you say then maybe a bent wheel axle.

if it's wobbling along the axis then it's not on the freehub properly. Either the last sprocket hasn't been lined up properly or the lock ring is too loose (40 Nm according to Shimano) (or nice and tight if you're using a bar up to 25-30 cm long and you don't have a torque wrench)

laurentian

schweiz wrote:

if it's wobbling about its axis like you say then maybe a bent wheel axle.

if it's wobbling along the axis then it's not on the freehub properly. Either the last sprocket hasn't been lined up properly or the lock ring is too loose (40 Nm according to Shimano) (or nice and tight if you using a bar up to 25-30 long and you don't have a torque wrench)

Thanks - I should have mentioned that I can't see any unusual movement in the wheel itself - I'd like to post a short video but don't know how!!

jeffw0502

I'm no expert but had this on my mtb, had a look on youtube and theres a couple of good vids on there. What i read, as posted before is bent axles or the cheaper hubs which are more prone to it.

schweiz

laurentian wrote:

show previous quotes

schweiz wrote:

if it's wobbling about its axis like you say then maybe a bent wheel axle.

if it's wobbling along the axis then it's not on the freehub properly. Either the last sprocket hasn't been lined up properly or the lock ring is too loose (40 Nm according to Shimano) (or nice and tight if you using a bar up to 25-30 long and you don't have a torque wrench)

Thanks - I should have mentioned that I can't see any unusual movement in the wheel itself - I'd like to post a short video but don't know how!!

youtube?

nicklouse

many cassettes do this. Nothing to worry about.

it will have done this from new.

laurentian

nicklouse wrote:

many cassettes do this. Nothing to worry about.

it will have done this from new.

That sounds like the least expensive remedy!!

Thanks to all - any other suggestions?

Bordersroadie

I thought all cassettes do this to a certain extent. Not an issue once in drive mode, nor in freewheel mode come to think of it.

laurentian

Bordersroadie wrote:

I thought all cassettes do this to a certain extent. Not an issue once in drive mode, nor in freewheel mode come to think of it.

That is good news - you learn something every day!

Thanks all