Brandane
Legendary Member
- Location
- Costa Clyde
Here's the background - the bike is a Specialized Secteur (2012) with Shimano Tiagra shifters, and a 9 speed cassette.
It was running fine on the original rear mech (Tiagra medium cage) coupled with an 11/26 cassette (or something close to that - it's been binned).
I decided I wanted a lower gear for the hills around here, so decided to get an 11/30 cassette, a new chain (Shimano dura ace 9 speed), and a long cage rear derailleur (Shimano Deore, same as my Tricross which works fine with 9 speed 12/32 cassette and same Tiagra shifters). Fitted the new parts, then.....
I am now finding that the chain will run smoothly on either the high gears, or the low gears, but not both! i.e. if you adjust the cable tension so that the gears shift smoothly from say 9th cog (smallest) to 8th, then it is too tight for it to drop from 1st cog (biggest) into second. Slacken it so that it drops from 1st into 2nd, and it is too slack to move from 9th into 8th, etc....
I have ruled out sticking cable (replaced both inner and outers and greased the inner when I did so). Chain length is correct. Tried different settings of the tensioner B screw and it makes no difference.
Any ideas?
It was running fine on the original rear mech (Tiagra medium cage) coupled with an 11/26 cassette (or something close to that - it's been binned).
I decided I wanted a lower gear for the hills around here, so decided to get an 11/30 cassette, a new chain (Shimano dura ace 9 speed), and a long cage rear derailleur (Shimano Deore, same as my Tricross which works fine with 9 speed 12/32 cassette and same Tiagra shifters). Fitted the new parts, then.....
I am now finding that the chain will run smoothly on either the high gears, or the low gears, but not both! i.e. if you adjust the cable tension so that the gears shift smoothly from say 9th cog (smallest) to 8th, then it is too tight for it to drop from 1st cog (biggest) into second. Slacken it so that it drops from 1st into 2nd, and it is too slack to move from 9th into 8th, etc....
I have ruled out sticking cable (replaced both inner and outers and greased the inner when I did so). Chain length is correct. Tried different settings of the tensioner B screw and it makes no difference.
Any ideas?