Chain won't shift to large chainring (Tiagra)...

[Mazz]

My bike's just come back from repair after an accident (rear wheel and brakes replacement). They've made some adjustments to the gear cables - now it's practically impossible to change from the small chainring to big by single hand strength alone (Shimano Tiagra groupset) -I need to dismount then use 2 hands , which (not surprisingly) is very inconvenient. Honestly thought I was going to snap the gear cable I had to use so much force.

Is it a case of slackening off the cable at the front derailleur gripping bolt and retightening? Looks like the barrel adjuster is fully wound in so I can't use that?

Alternatively it's back to the shop, let them sort it.

Thanks

 

[Paulus]

It could be that the adjuster stop needs a tweak to allow the mech to go over far enough.

 

[figbat]

It could be that the adjuster stop needs a tweak to allow the mech to go over far enough.

This would be my first port of call - the upper limit screw. Gently does it, little tweaks at a time with a test ride in between. I find that a ride is required to see if it all works - a bike that changes perfectly on the workshop stand can sometimes be off when under power.

 

[Mazz]

Cheers for the replies...this is the bit I am bound to get wrong. Which of the screws is it and in which direction should it be turned? I'll try find a diagram I think.

 

[roubaixtuesday]

The High stop is the one you want, marked with an H.

Undo it half a turn at a time.

If uncertain, you can always undo them both a couple of turns, to see if it makes a difference at all, then wind back to base position before making sure you've got the right one.

 

[Vapin' Joe]

Front mech adjuster stops are not generally marked. If yours isn't, upend the bike and you will see the screw which is butting against the stop when you try to shift, this being the one to tweak.

 

[Mazz]

The High stop is the one you want, marked with an H.

Undo it half a turn at a time.

If uncertain, you can always undo them both a couple of turns, to see if it makes a difference at all, then wind back to base position before making sure you've got the right one.

Yes mate thanks. No H or L marks on mine but a quick video showed me it's the screw furthest from the bike's Centreline. Some short turns anticlockwise seems to have done the job but I'll find out when riding tomorrow.