RD skipping under pressure

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

RD skipping under pressure

Postby nickobec » Fri Nov 09, 2012 11:02 pm

Just built up a new FM066SL, took for test ride, if I put pressure of pedals, ie climbing a slight hill, accelerating the chain would skip around on the cassette.

Ended up changing the RD, the gear cable, cassette and rear wheel and the skipping is still there.

Any suggestions of likely cause, all I have left is misaligned RD hanger
User avatar
nickobec
 
Posts: 1434
Joined: Thu Mar 26, 2009 11:51 pm
Location: Perth or 42km south as the singlespeed flies

by BNA » Fri Nov 09, 2012 11:23 pm

BNA
 

Re: RD skipping under pressure

Postby Mulger bill » Fri Nov 09, 2012 11:23 pm

If you haven't mixed used components in and the setup and tension is right then it does sound like something is out of shape :(

EDIT Is it happening right across the stack or in one particular gear?
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25552
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Re: RD skipping under pressure

Postby nickobec » Fri Nov 09, 2012 11:47 pm

Components - Slightly used SRAM Red shifters, new SRAM red cranks, used SRAM red & rival RD, used Force FD, 1070 and OG 1090 cassette, new KMC X10 SL chain. So basically light used SRAM drivetrain.

Occurs anywhere in the range, though less frequent when on the biggest or smallest cog on the cassette.
User avatar
nickobec
 
Posts: 1434
Joined: Thu Mar 26, 2009 11:51 pm
Location: Perth or 42km south as the singlespeed flies

Re: RD skipping under pressure

Postby Mulger bill » Fri Nov 09, 2012 11:58 pm

New chain and used cassette? If you've still got the old chain, whip out the ruler and measure it...
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
User avatar
Mulger bill
Super Mod
Super Mod
 
Posts: 25552
Joined: Sun Sep 24, 2006 2:41 pm
Location: Sunbury Vic

Re: RD skipping under pressure

Postby nickobec » Sat Nov 10, 2012 10:30 pm

Mulger bill wrote:New chain and used cassette? If you've still got the old chain, whip out the ruler and measure it...


New frame, so no old chain.

I have three wheelsets which get moved around between bikes (training/commuter bike - about to replace one chain as it hit 0.75%, race bike chain 3,0000km and still good and poseur bike - brand new chain 200km)
Training wheelset, with 11-23 1070 cassette that has seen 3,000km on 3 different bikes/chains - no issues
Racing wheelset, with 11-23 OG 1090 cassette that has seen 1,500km on a single chain (race bike) this is what caused me grief on Thursday.
Climbing wheelset with 11-26 1070 that has seen 500km on a single chain (race bike)

Have a lightly used chain from another project , I will try to see if that is an issue with the chain
User avatar
nickobec
 
Posts: 1434
Joined: Thu Mar 26, 2009 11:51 pm
Location: Perth or 42km south as the singlespeed flies

Re: RD skipping under pressure

Postby ytd » Sun Nov 11, 2012 2:09 pm

in my experience skipping is nearly always a compatibility problem between the chain and cassette, assuming neither is worn. Once had really bad skipping with new components. Realised that I had put a mislabelled 8 spd chain on a 9 spd cassette.
ytd
 
Posts: 11
Joined: Fri Apr 13, 2012 4:46 pm

Re: RD skipping under pressure

Postby jules21 » Sun Nov 11, 2012 9:06 pm

old chain on new chainset could possibly cause slipping. i have had this problem several times and i always end up solving it with new drivetrain (chain, cassette, rings) across the board. one day i will learn :)
Image
User avatar
jules21
 
Posts: 8542
Joined: Thu Apr 02, 2009 10:14 pm
Location: deep in the pain cave


Return to The Shed

Who is online

Users browsing this forum: No registered users



Popular Bike Shops
Torpedo 7 Torpedo7 AU
Ground Effect Ground Effect NZ
Chain Reaction Cycles CRC UK
Wiggle Wiggle UK
Ebay Ebay AU



InTouch with BNA
“Bicycles BNA Twitter
“Bicycles BNA Facebook
“Google+ BNA Google+
“Bicycles BNA Newsletter