Gears

[lingus75]

I am embarassed to admit it (used to work in bike shop, a long time ago) but I cannot for the life of me get the front mech set-up to run without rubbing the chain in the available gear range. I have not used rapidfire before and I am unable to adjust properly. If I use the adjustment on the lever (mainly in the big ring) I either have rubbing through mid-range and none in the high gears or vive-versa. I assume you cannot 'trim' the fornt lever as you can with thumbies?

If I push the lever a bit over the index and hold it then all good but it springs back to its pre-set. Front mech limit screws will have nothing to do with this as they are set properly, I just need to adjust the index range.

How do I do this and is this a by-product of running a 9speed block?

Edited by lingus75 on Tuesday 29th January 22:27

[Xenocide]

Play with the barrel adjuster on the shifter?

[pawsmcgraw]

On many of these cheaper set ups, like the lower end shimanos, i end up having to open the guides on the front mech to make the clearance greater, especially on wider 8 speed chains(real cheap stuff)Just brutaly bend them outwards make the gap a couple of mill wider.
Granny gear and 1st on cassette, minimum clearance inboard, make cable tight but not lifting of lower limit screw.
Everything else upward of that should be fine as long as high limit screw is set.Maybe have to wind cable off a tad for first on cassette and big ring, maybe not......
All else fails,file it under bin, deep breaths and x..t..ahhhh

[lingus75]

pawsmcgraw said:

On many of these cheaper set ups, like the lower end shimanos, i end up having to open the guides on the front mech to make the clearance greater, especially on wider 8 speed chains(real cheap stuff)Just brutaly bend them outwards make the gap a couple of mill wider.
Granny gear and 1st on cassette, minimum clearance inboard, make cable tight but not lifting of lower limit screw.
Everything else upward of that should be fine as long as high limit screw is set.Maybe have to wind cable off a tad for first on cassette and big ring, maybe not......
All else fails,file it under bin, deep breaths and x..t..ahhhh

Deep breaths as its XT and (in a country accent) XT'RRRRRR! I think I will have to play around with it some more but I am finding I either have loq gears fine or high gears fine, not both at the same time. I will try the granny ring method though.

[pdV6]

lingus75 said:

I think I will have to play around with it some more but I am finding I either have loq gears fine or high gears fine, not both at the same time. I will try the granny ring method though.

Are you saying that in the biggest chainring either it rubs on the lowest sprocket or the highest, depending on how you adjust it?

If so, I wouldn't worry about it as you should be in the middle ring long before needing to run the largest sprocket with the biggest ring.

My current setup rubs a little in one or two gears, but that's because I'm running an 8sp setup with a front mech designed for 9sp chains. Compared to the older 8sp mechs, the newer 9sp ones seem to have a small angled plate at the front that causes the rubbing. Once I've bought my own mech (current one is borrowed from Neil) I may try bending this plate out slightly to cure it.

[Moose.]

Have a read here:

http://www.parktool.com/repair/readhowto.asp?id=75

Following this I got mine setup perfectly after changing to LX stuff

[lingus75]

pdV6 said:

lingus75 said:

I think I will have to play around with it some more but I am finding I either have loq gears fine or high gears fine, not both at the same time. I will try the granny ring method though.

Are you saying that in the biggest chainring either it rubs on the lowest sprocket or the highest, depending on how you adjust it?

If so, I wouldn't worry about it as you should be in the middle ring long before needing to run the largest sprocket with the biggest ring.

My current setup rubs a little in one or two gears, but that's because I'm running an 8sp setup with a front mech designed for 9sp chains. Compared to the older 8sp mechs, the newer 9sp ones seem to have a small angled plate at the front that causes the rubbing. Once I've bought my own mech (current one is borrowed from Neil) I may try bending this plate out slightly to cure it.

I'm not using anything but bottom 4 gears on rear when in the big ring and middle ring either rubs in low gears or high gears (depending on how its adjusted, have spent a long time fine adjusting also with no joy). When on the big ring I have the mech adjusted to be just right when in smallest rear gear and if I keep lever pressed it's fine but when I let go it springs back to rubbing. So, it has enough travel to compensate but returns to rubbing when I release the lever and the extra travel is gone.

[pastrana72]

i know you have probly checked this, but is the guide straight to the chainrings, may need the slightest twist at the clamp, I reckon if you keep trying you may sort this, but 9 speed front mechs will always rub a bit with a 8 speed set up as the chain is fractionally wider. Mine does a bit, but i a have 9 speed to replace when the current chain and cassette dies. That will sort it.

Good Luck

[lingus75]

It is now apparent that after reading the Parktools tech advice the problem is thus:

'If all aspects of front derailleur adjustments are correct on this bike, the rider is simply exceeding the engineering and design capabilities of the machine.'

I am clearly to powerful and brilliant that Shimano are yet to keep up with my all-round excellence

Dear Mr Shimano........