SRAM wiFli cassette problem

Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies

SRAM wiFli cassette problem

Postby brit_in_oz » Thu Jan 23, 2014 8:00 pm

I just put a new Force wifli medium cage rear mech on my force groupset on shimano RS80 wheels. previously it was running compact/28 cassette with no issue but wanted something bigger for the three peaks. I replaced the chain (1090)and cassette (1050) at the same time and the chainrings are less than 3 months old. i have found no matter how much i adjust the cable tension i either get a noise on the 4th sprocket down, or if i adjust this to run smooth / quiet the 7th-10th have noise. Not as bad as the 4th but still a metallic rub (like the the side plates just rubbing a little). if i adjust this by reducing the tension a fraction then the noise on the 4th returns. Its only the 4th, not the 3rd or 5th, which are all perfect.
I have the B tension adjusted to 6mm as per the SRAM guidelines in the large/large. Even tried adjusting this a bit either way, no change to the noise. I have adjusted the high/low position so all the cluster is traversed perfectly
If i change the wheels to another set with a 26 cassette (Fulcrum 3's) i don't get any noise through the cluster. its driving me crazy as its 1/4 to 1/2 a turn either way fixes one but makes the other worse so i know its not the cassette itself but how the chain is running through it
Could it be the reach mech alignment? its all i can think of it being as everything else seems to be adjusted according to specs and its all new kit.
Don't mistake lack of talent for genius
brit_in_oz
 
Posts: 170
Joined: Mon May 10, 2010 9:04 pm
Location: Mount Waverley

by BNA » Thu Jan 23, 2014 8:47 pm

BNA
 

Re: SRAM wiFli cassette problem

Postby Duck! » Thu Jan 23, 2014 8:47 pm

You may need to fine tune the high (outer) limit. This sets the derailleur's "resting" position, from which the indexing is calibrated. If it's slightly overshifting & dragging on the next bigger sprocket, you need to drop the limit out a tad.
I had a thought, but it got run over as it crossed my mind.
Duck!
Expert
 
Posts: 1370
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

Re: SRAM wiFli cassette problem

Postby brit_in_oz » Thu Jan 23, 2014 8:52 pm

Thanks Ducky, will try that tomorrow and see if it helps. How much adjustment should i try , like a fraaction of a screw turn or a half/full rotation?

Forgot to say its an 11-32 cassette i have now :)
Don't mistake lack of talent for genius
brit_in_oz
 
Posts: 170
Joined: Mon May 10, 2010 9:04 pm
Location: Mount Waverley

Re: SRAM wiFli cassette problem

Postby Duck! » Thu Jan 23, 2014 8:58 pm

1/8 to 1/4 turn at a time. You don't want to go too far, otherwise you'll spit the chain off the end of the cassette & jam it against the frame.
I had a thought, but it got run over as it crossed my mind.
Duck!
Expert
 
Posts: 1370
Joined: Tue May 21, 2013 8:21 pm
Location: On The Tools

Re: SRAM wiFli cassette problem

Postby brit_in_oz » Fri Jan 24, 2014 6:58 pm

Ok Ducky, no luck :( i went across the range from just changing down to nearly dropping off, could not detect any change in the noise. Did have a bit of sucsess changing the cassette onto the Fulcrum 3's, the noise is still present on the 4th or 7-10th but i managed to balance it so its better across the range. Putting my 28 back on the RS80's and they didnt seem to create the noise, only the 32 does.

So do you have any more idea, besides the derailleur angle possibility>
Don't mistake lack of talent for genius
brit_in_oz
 
Posts: 170
Joined: Mon May 10, 2010 9:04 pm
Location: Mount Waverley


Return to The Shed

Who is online

Users browsing this forum: jackthelad



Top Bikes & Gear
Torpedo 7 Torpedo7 AU
Cell Bikes Cell Bikes AU
Ground Effect Ground Effect NZ
Ebay Ebay AU
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
ProBikeKit ProBikeKit UK
Evans Cycles Evans Cycles UK
JensonUSA Jenson USA
JensonUSA Competitive Cyclist