Shimano rederailer prob

ma123

Hi I have a rear Shimano Tiagra derailer on my commuter bike which I purchased from Wiggle, its been fine for a couple of months used most days 13 mile round trip on road and canals and its already started slipping after changing gear.

Does it need adjusting which I dont like doing as I usually make it worse or should I put some grease on it as it does seem dry.

Any advice appreciated.

Big Red S

Is it the mech that's slipping or the chain?

If it's the chain, how worn is your chain and cassette?

The mech shouldn't be greasy - it should 'seem dry'.

Mog Uk

Sounds like it just needs adjusting, if it's been fine then the adjustment required will be very small..

If it's slipping down the gears then turn the cable adjuster anticlockwise, if it's changing up the gears then turn the cable adjuster clockwise ( 1/4 turns are all it will take )

bbtothehead

As in slipping but staying on the same cog or slipping as in off the cog to a higher/lower gear?

Get some proper chain lube rather than grease, a dry chain is not gonna last, would be a good place to start. Something like Finish Line Teflon Plus Dry Chain Lube would be ideal for a commute bike at about £5 a can after giving it a clean and de-grease.

Andy

ma123

Hi cheers for the help ill use some teflon lube first I know ive got some in my toolbox somwhere and then if that dont work ill have to make some small adjustments.

doktorsteve

This sounds like the problem I have with my Tiagra cassette. The chain seems to climb up the side of the 6th sprocket then jump. The cassette is 1200 miles old and the chain is new. I could not detect any stretch on the chain I took off so I don't think there can be any significant wear on the cassette. It got pretty bad last night. I thought the mech was out of adjustment so gave it a tweak but after a few miles the chain was jumping again.
At least now it is getting worse I may be able to find the problem.

keef66

doktorsteve,

you absolutely sure you have the correct chain?

doktorsteve

Hi Keef66. Good question. Its a KMC X9L in super shiny silver colour plate!
I played with the adjustment screw a bit more tonight. I found that I get slightly different alignment of the jockey wheels with the sprockets depending on whether I shifted up or down onto the problem sprocket. There were some cases where the chain ran on the sprocket for a while then tried to jump to the next slmallest sprocket, but only succeeded in riding up then falling back. I found the best set up when I twisted the adjuster anticlockwise to pull the chain against the next largest sprocket then twisted it clockwise about 1 turn to stop it rubbing.
Hopefully this will stop the jumping tomorrow.
I hope that helps you MA123 (assuming you are still with us!)

slimbob

doktersteve, sounds like you might have friction between the cable housing and cable. if it persists, replace or dissassemble and lubricate with Gt85 or similar. Just a suggestion!

doktorsteve

Rode to work this morning with absolutely no gear problems.
Slimbob I did consider a sticky cable so dosed the cable with dry lube.
I cleaned the jockey wheels out while I was changing the chain. One of the jockey wheels has a wider bush which allows some side to side movement of the wheel. I did not note where it came from. I put it back in the position nearest the cassette assuming that the movement was there to allow for some float in the freewheel. This might account for the different alignments. Hopefully I can find out which jockey wheel goes where from the Shimano website. :?