Tightening cassette - how much pressure?
Discussion
Grrrr.
Bought my new cassette today and impressed myself with my homemade chain whip, so far so good, that is until I go to tighten the lock ring and just I get to the 'apply pressure' stage SNAP! On inspection half of the plastic thread on the freehub has come off, it looks like a new freehub is on order :-(
Now, I've attached cassettes before and I certainly don't think I applied excessive force, curious as to how you guys would describe the appropriate pressure to apply.
Bought my new cassette today and impressed myself with my homemade chain whip, so far so good, that is until I go to tighten the lock ring and just I get to the 'apply pressure' stage SNAP! On inspection half of the plastic thread on the freehub has come off, it looks like a new freehub is on order :-(
Now, I've attached cassettes before and I certainly don't think I applied excessive force, curious as to how you guys would describe the appropriate pressure to apply.
gazza285 said:
Non of my bikes have had any plastic threads on the freehub? What components do you have?
Shimano R500 hub with 105 cassette.From instruction on the bike maint course I did, previous cassette fitting experience and internet 'wisdom' it would suggest that I did it right, obviously my now broken freehub would suggest otherwise!
The wheel is only 2 months old so I'll ask very nice in the LBS for it to be replaced under warranty, although I'm pretty sure I know what the answer will be!
deckster said:
I don't understand why you needed a chainwhip to install a cassette. Surely the cassette slides onto the hub, apply lockring, turn to hand tight. Job done. The lockring is only there to stop the cassette falling off, it doesn't need to take any strain itself.
To take the old one off 
TheFungle said:
Grrrr.
Bought my new cassette today and impressed myself with my homemade chain whip, so far so good, that is until I go to tighten the lock ring and just I get to the 'apply pressure' stage SNAP! On inspection half of the plastic thread on the freehub has come off, it looks like a new freehub is on order :-(
Now, I've attached cassettes before and I certainly don't think I applied excessive force, curious as to how you guys would describe the appropriate pressure to apply.
40Nm Bought my new cassette today and impressed myself with my homemade chain whip, so far so good, that is until I go to tighten the lock ring and just I get to the 'apply pressure' stage SNAP! On inspection half of the plastic thread on the freehub has come off, it looks like a new freehub is on order :-(
Now, I've attached cassettes before and I certainly don't think I applied excessive force, curious as to how you guys would describe the appropriate pressure to apply.
jodypress said:
If you were tightening the cassette than you shouldn't need a chain whip, as that's generally for removing the cassette.
On my Shimano locknut it says 40nm which is what I torque it up to. No problems in many years of changing cassettes.
Chain whip was to take old one off On my Shimano locknut it says 40nm which is what I torque it up to. No problems in many years of changing cassettes.
Yup, 40nm is the stated torque setting but not having access to a torque wrench it's very much a case of guessing and going by feel/experience/jedi intuition.
A happy end to this little tale
LBS sent the part back to Shimano who agreed to replace it under warranty, the replacement freebub which I bought was refunded to me as a credit.
It certainly goes to show the worth of purchasing through an LBS, although I'm sure the outcome would be the same if I'd gone through Wiggle the experience would certainly not of been as painless.
LBS sent the part back to Shimano who agreed to replace it under warranty, the replacement freebub which I bought was refunded to me as a credit.
It certainly goes to show the worth of purchasing through an LBS, although I'm sure the outcome would be the same if I'd gone through Wiggle the experience would certainly not of been as painless.
TheFungle said:
A happy end to this little tale
LBS sent the part back to Shimano who agreed to replace it under warranty, the replacement freebub which I bought was refunded to me as a credit.
It certainly goes to show the worth of doing the job properly in the first place.
Fixed that for ya.LBS sent the part back to Shimano who agreed to replace it under warranty, the replacement freebub which I bought was refunded to me as a credit.
It certainly goes to show the worth of doing the job properly in the first place.
If you don't have a torque wrench do it up finger tight, then quarter to half a turn. If the cogs rattle, try a little more. If they still rattle, you may have left the 1mm spacer off by mistake and no amount of brute force will solve that. I think 10 speed cassettes on 9/10 speed freehubs need the spacer.
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