Stiff front mech
gubber12345 Posts: 493
edited July 2017 in Workshop
The front mech on my road bike is very stiff to change up into the big ring.I've replaced the inner and outer cables and still it's the same if not worse now...any ideas as what's causing this or do I maybe need a new front deurailleur.
Lapierre Aircode 300
What's the mech/shifters? Could just be setup.
If it's a Shimano double I've seen a lot of those where the trim position was being used to put it on the big ring - which makes it very stiff. I think that caused a lot of the broken shifters that were common 10 years ago.
How would I know if it's on the trim function....i just pushed the lever til it was on the lowest setting to go on the small ring again.
I would start from scratch - if your limit screws are a little off then that means you really have to force the lever for it to catch the pawl. Here's my method - best I've ever had with Shimano 5600, no trim needed for the big ring and a really easy shift onto it.
Start over. Undo the cable.
When clamping the front derailleur to the frame make sure the gap between the big chainring teeth and front derailleur cage is 2-5mm.
So first, with the cable de-attached. Put the chain on the small front ring and biggest back cog. Make sure to click the downshift lever into its lowest postion.
Adjust the inner limit screw (closest to the frame on the front derailleur) so the gap is 1mm from the chain to the inner side of the front derailleur.
Wind out the outer limit screw so it doesn't interfere in the next stage.
Clamp the cable (finger tight cable tension - not too much). Then shift the chain onto the 11t cog (or smallest) at the back, and shift the front onto the big ring. There should now be some chain rubbing on the cage if you spin the cranks.
Then wind the inline barrel adjuster (adding more cable tension) until there is a 1mm gap between the outer cage and chain, and no chain rub. Look down at the front derailleur cage as you do it.
Then wind the outer limit screw in until it just touches the stop.
Now shift the chain onto the small front ring, and the rear onto the second to last smallest cog. Then click into the front small ring trim position. Now whilst in the trim position - add more tension again with the barrel adjuster until there is no rub. Leave a gap of 2mm from the chain and the outer cage. This will eliminate any slop in the trim position and make it feel more positive.
Check all gears and trim settings. Make sure the chain isnt being thrown over off the big ring.
There will always be rub in the small/small combo. This is the chain rubbing on the big ring not an adjustment issue.
Have you routed the cable correctly as that is probably the reason for a difficult change.
I've went through all the guides and even the parktool one couldn't explain what I did wrong with my front mech!