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PostPosted: Wed Aug 01, 2012 11:19 pm 
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Bought a c2000 GT Tempest with 8 speed rear cassette... chain, cassette and chainrings were all pretty battered... middle chain ring was so worn it was unusable, and the rear cassette regularly jumped/slipped...

So I've invested in new Shimano Acera chainrings, shimano chain and shimano HG41 rear cassette, slapped them all on my reasonably new rear wheel (6 months old) but now the chain jumps all over the place when in the highest gears (top 2)... when the cable is "slackest".

Previously the rear hub had an 7 speed cassette, which I've removed and replaced with the 8 speeder.

Question is: do I need to tinker with the spacers so that the cassette's a little further away from the frame and there's a little more tension in the gear cable?

Also noticed that when I spin the wheel then let it freewheel the cassette wobbles/oscillates a bit, like the freehub's a bit wonky (only a bit mind) lots of videos on YouTube showing this affect, most saying it's 'normal'...

Any advice please, missing my top gears!

JP


Last edited by poolio on Thu Aug 09, 2012 8:18 pm, edited 2 times in total.

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PostPosted: Thu Aug 02, 2012 7:39 am 
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assuming the shifters and cassette are both 9 speed, it sounds like you just need to adjust the limit screws and cable tension.


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PostPosted: Thu Aug 02, 2012 10:10 am 
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also chech rear mech hanger isn't bent/twisted or mech has excessive side play on main pivot and is worn......new inner /out cable may be needed a old cables can cause too.


Last edited by greenstiles on Thu Aug 02, 2012 1:15 pm, edited 1 time in total.

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PostPosted: Thu Aug 02, 2012 10:36 am 
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I agree, sounds like possible limit screw.


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PostPosted: Fri Aug 03, 2012 10:08 pm 
retrobike rider
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+1 with the limit screws or the check the rear mechs top jockey wheel is not too close the the cassette...


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PostPosted: Fri Aug 03, 2012 10:26 pm 
Gold Trader / rb Rider / Special
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wookiee wrote:
+1 with the limit screws or the check the rear mechs top jockey wheel is not too close the the cassette...


Which is b tension.


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PostPosted: Fri Aug 03, 2012 10:29 pm 
retrobike rider
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Ha thanks Cyfa! I don't know what stuffs called but I nose what it duz...!


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PostPosted: Fri Aug 03, 2012 10:53 pm 
Gold Trader / rb Rider / Special
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Haha well thats all that matters.









Mostly.


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PostPosted: Fri Aug 03, 2012 11:00 pm 
retrobike rider
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:D


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PostPosted: Tue Aug 07, 2012 8:51 pm 
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wookiee wrote:
...check the rear mechs top jockey wheel is not too close to the cassette...


And if it is... how do you move it away? I've twizzled the screw that rotates the mech round as far as possible, but the jock wheel is still pretty darned close...

The rest of you - thanks for taking the time!

JP


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