Rear cassette on Shimano Sora not turning straight ?

[Black Bird]

Helo , how are you ? My 2nd question today .

Using a Shimano Sora 9spd Double .
I turn the bike over and noticed that when I turn the crank , the rear cassette spin but not turning entirely round . Its not moving , sorry for the wobble on topic . Just not turning straight .
Both front and rear wheel turns true and not noticing any problem when cycling .

Is it normal ? Or my wheels are out of alignment ?
Bike is a used so could be of that .

Thanks !!!

 

[Herzog]

Doesn't sound healthy. Could you take the chain and cassette off and investigate further, or would this be a trip to the LBS?

 

[Black Bird]

hmmm what's the LBS ? The cassette bearing seems to be fine and so do the spokes of the wheel .

 

[jim55]

local bike shop

 

[Headgardener]

Now then Black Bird this may be a very silly question but which way did you turn the pedals when the bike was upside down? Because if you turned them forwards then the cassette would freewheel on the hub just as you have descibed. Sorry if I am teaching your grandmother to suck eggs as the saying goes but I'm only trying to help.

 

[Rickshaw Phil]

Sounds suspiciously like a bent axle if I'm interpreting your description correctly. Best for the local bike shop to look at it and confirm what's up.

 

[BigTam]

Depends how much it wobbles, they all seem to have a slight deflection.

 

[Paulus]

If the wheel is running true, has the cassette become loose, the lock nut may of loosened? If you have the wherewithall to take the cassette off and check it, do so, or it will be a trip to the bike shop.

 

[Hacienda71]

As Paulus says, if you have the tools strip it clean everything and reassemble and tighten fully. You can have a look at the skewer at the same time.

 

[Black Bird]

Thanks so much guys . Booked an appointment for em with the doctor next week .
Hope its nothing serious . Bike have no signs of accident or fallen though , so hope its not the frame .

 

[Black Bird]

Now then Black Bird this may be a very silly question but which way did you turn the pedals when the bike was upside down? Because if you turned them forwards then the cassette would freewheel on the hub just as you have descibed. Sorry if I am teaching your grandmother to suck eggs as the saying goes but I'm only trying to help.

I turned it backwards like when one cycle .