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PostPosted: Sat Nov 25, 2006 8:09 pm 
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Location: Stirling
Hi all, I heard about this from the guys at the Proflex Forum. I ride a 1996 Proflex Beast, and I'm really struggling with my XTR M950 Cassette. Bike was working fine but I decided to upgrade to XTR MEch, TI Cassette Middleburn Cranks and SRAM Chain. Now its constanly jumping in the highest(little cog), it feels like it would if the chain or cassette was worn out. So every time I put the power down it jumps, its incredibly annoying. Do I need a specific chain for this cassette? I think its a SRAM 8 speed chain, new. I changed back to my XT mech as it seemed that the XTR didn't have enough adjustment down towards the lower cogs. Help would be appretiated, as it is making me wanna smash my bike! Thanks, Steve


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PostPosted: Sat Nov 25, 2006 8:28 pm 
Concours Judge
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Hi Kneedowndean,

Welcome!

I can tell I use a Sachs Sedis on that cassette on my Yo and it works fine.

Sometimes really mysterious things happen. About 10yrs ago I put a new Sedis on new 8s XT cassette and everytime I took the bike out for a ride, the 1st 2kms everything was fine, but after that things changed rapidly and within a few hundred meters the chain jumped multiple times in 1 crank rotation! No matter what force I put on it. I simply put another chain on and that 1 is still going strong 8)

- Melvin


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PostPosted: Sat Nov 25, 2006 9:06 pm 
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This is the 2nd chain. 1st one was an 8 speed wipperman, that jumped straight away but there are reporsts these did that. So then bough an 8 speed SRAM. Think maybe I'll try a Shimano one, what is the model number for this cassette? Is it the HG90 Chain?


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PostPosted: Sat Nov 25, 2006 11:54 pm 
East Midlands AEC
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Hi Steve, Orange from Proflex forum here, I had the same problem with a SRAM chain that was brand new - it just didn't want to work with Shimano... kept on jumping


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PostPosted: Sun Nov 26, 2006 12:21 pm 
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Joined: Wed Jun 14, 2006 3:35 pm
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Location: Newbury
how old is the cassette? it wont mesh well with a new chain.

as for jumping in small cog, if you have a workstand, spin the cranks in that gear, with a screwdriver on the limit adjuster, tweaking it, intill its completly silent. (you gota do this in a quiet place!)

sometimes you get jumping in the higher gears, due to the chain passing over a much lower amount of teeth, so the tuning has to be spot-on.


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PostPosted: Sun Nov 26, 2006 12:36 pm 
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Both Chain and Cassette are brand new. This is why I cant understand it, cos its acting like its worn. I have adjusted the limit screws fine, and tried another chain. I think I'll have one last try with a new chain, maybe a shimano one. Is it the HG90 chain I need or the IG90?


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PostPosted: Sun Nov 26, 2006 12:42 pm 
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Both Chain and Cassette are brand new. This is why I cant understand it, cos its acting like its worn. I have adjusted the limit screws fine, and tried another chain. I think I'll have one last try with a new chain, maybe a shimano one. Is it the HG90 chain I need or the IG90?


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PostPosted: Sun Nov 26, 2006 2:12 pm 
retrobike rider / Gold Trader
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Joined: Thu Dec 08, 2005 12:29 pm
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I just ordered one of these - the CRC site said you need an IG chain with this cassette - I bought an SRAM one, will see how I get on when it arrives tomorrow!

CRC Linky :-
http://www.chainreactioncycles.com/Models.aspx?ModelID=5595

Good luck!


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PostPosted: Sun Nov 26, 2006 3:51 pm 
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Location: Stirling
I'm going to order an IG70 from Ebay, I'll post the results when it arrives. Thanks for all the help guys.


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PostPosted: Sun Nov 26, 2006 4:59 pm 
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Location: Hobbiton-on-the-Water
fiddle with the mech tesion screw, large screwhead hidden inside mech

SORRY 9 MONTH OLD HELPER STOPS ME TYPING MORE FYILM,,./,./KN


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