rear derailler indexing

mcowan77

folks

im having a wee problem getting the indexing on my rear derailler correct. i dont want to put it into the shop as i want to
learnhow to do this myself.

heres what im doing

chain is on the middle front ring ( its a triple), back small ring

ive undone the pinch bolt and turned the barrel adjusters clockwise on both the derailler and the shifter so the cable has the most amount of slack.

ive pulled the cable at the derailler reconnected the pinch bolt. ive then clicked the shifter to take the chain onto
the seconed sprocket at the rear and slowly turned the barrell adjuster anti clockwise untilthe chain jumps onto the second sprocket

fine!!!.. the chain moves up the gears fine, but coming back down the changes are very sluggish and at the last click it wont drop onto the smallest ring!!!!!


any idea what im doing wrong!!!!


cheers

nicklouse

mucky cable. damage to the outer. or too much cable tension.

read the how too on park tools.

but using the barrel adjuster to set the tension as you are is wrong.

mcowan77

thanks for the reply nick

its a new cable, ill have alook at the park how to, if i dont use the barrel adjusters to increase tenion, how do i do it?


cheers again

mcowan77

reg usuing the barreladjusters for cable tension, i took the advice from here

it looked simple enough!!!!

http://www.youtube.com/watch?v=SkzvfCaIbyQ

lef

Only continue turning the adjuster until the chattering noise disappears. Dont go too far past this point or you will over tension so restricting the chains ability to drop back.

Also check out shimano tech docs for indexing. It may be a little out. Also check b tension and adjust screw as required. The jockey wheel teeth should be around 7mm clear (I think, but check optimum distance) from the cassette teeth.

Also definitely clean the cables and lube with rock n roll magic cable lube or similar.

will3

mcowan77 wrote:

thanks for the reply nick

its a new cable, ill have alook at the park how to, if i dont use the barrel adjusters to increase tenion, how do i do it?


cheers again

Yes but is the cable outer new also?

9/10 this is caused by a sticky cable and if the outer is old and corroded/worn it'll not go away.

mcowan77

Cheers for the replies.
Ive fitted a new cas and cables.shiftiing is great apart from the when i have chain on big ring at frnt.cant shift from second smallest cog 2 smallest!.
it shift fine when on middle and small chainrings

Any ideas?