Sheared threads tightening cassette

[RhythMick]

Replaced a spoke today and re-trued the wheel - quite pleased as it was my first. Ruined it by shearing the threads putting the cassette back on.

I was using the park tools tw2 beam wrench. It showed nothing like 40 Nm, but I wish I'd trusted my gut which was telling me something was wrong.

Am I likely to be able to replace the threaded part? Don't even know what that bit is called.

 

[simon.r]

Cassette or freewheel?

If it's the threaded part of the hub that the freewheel threads onto it means a new hub, which in practice probably means a new wheel.

If it's the threaded end of the freehub that the cassette fits onto, the freehub should be replaceable.

 

[slowmotion]

Cassette lockrings tend to have really fine threads and cross-threading them is quite easy to do. You could try getting a replacement lockring and seeing if that works. If the thread on the free hub is fubared, you need a new free hub. It's often more economical to get a complete new wheel than put on a replacement free hub, as @simon.r has said.

 

[RhythMick]

I think it's the freehub - dark bit with slots that the cassette sits on. Think I'll pop it in to my LBS who are great with these things.

 

[Tim Hall]

Cassette lockrings tend to have really fine threads and cross-threading them is quite easy to do. You could try getting a replacement lockring and seeing if that works. If the thread on the free hub is fubared, you need a new free hub. It's often more economical to get a complete new wheel than put on a replacement free hub, as @simon.r has said.

No, simon.r said get a new wheel if it's the freewheel thread that's damaged. New freehub bodies, which is what the OP has are much cheaper than a new wheel and are easy to swap out.

 

[RhythMick]

No, simon.r said get a new wheel if it's the freewheel thread that's damaged. New freehub bodies, which is what the OP has are much cheaper than a new wheel and are easy to swap out.

Not a job I've looked into but would like to try it. The wheel is maybe 18 months old and the rims have plenty of life. It was from SPA I think, part of a pair when I bought my dynamo hub front. Worth saving.

 

[slowmotion]

No, simon.r said get a new wheel if it's the freewheel thread that's damaged. New freehub bodies, which is what the OP has are much cheaper than a new wheel and are easy to swap out.

Fair enough, but it depends on how fancy your wheels are. A replacement freehub on my last bike was going to cost £35 while a fairly passable wheel was £50. Since the old wheel was three years old, it wasn't a hard decision to make.

Edit: cross post with the above.

 

[broady]

It's pretty straight forward to swap over free hubs. I take mine off to clean when I do the bearings on the commuter as it's out in sll weather.
Hope you are back on the road soon

 

[Dogtrousers]

FWIW the only time I've ever used a torque wrench in anger I ignored my gut and sheared a bolt. I just use it as a socket driver thing now. (Not blaming the tool btw. Probably my own silly fault)

 

[Milkfloat]

 

[RhythMick]

FWIW the only time I've ever used a torque wrench in anger I ignored my gut and sheared a bolt. I just use it as a socket driver thing now. (Not blaming the tool btw. Probably my own silly fault)

Yeah that's just how I felt. Should have trusted my gut.

 

[RhythMick]

It's pretty straight forward to swap over free hubs. I take mine off to clean when I do the bearings on the commuter as it's out in sll weather.
Hope you are back on the road soon

I have spare wheels fortunately so I'm on the road thanks. I'll look up replacing the freehub.

 

[T4tomo]

I know it's after the event, but a cassette doesn't need to be on particularly tight anyway, as it will tighten as you ride to some extent. That's why getting them off can be a pain.

 

[raleighnut]

I know it's after the event, but a cassette doesn't need to be on particularly tight anyway, as it will tighten as you ride to some extent. That's why getting them off can be a pain.

No, a freewheel will tighten as you ride it, there is no torque applied to a cassette lockring they simply hold the sprockets onto the splines.

 

[T4tomo]

No, a freewheel will tighten as you ride it, there is no torque applied to a cassette lockring they simply hold the sprockets onto the splines.

You're correct! It's early!