One for the mechanics..or gifted in bike knowledge?

Andy T · Oct 27, 2013

legrandefromage":19f55rta said:
something like:

Legrandefromage, can you explain the photos, all I can see is a clamped cable, what am I missing?

Ramage, 'under load' is simply slow pedalling along the flat, nothing taxing for the drive train. Shifters are nice and smooth with all the required 'clicks', it seems that the third click just isn't enough to move the the mech far enough.

The mech pivots are all good, no play in the pivots, mech moves freely manually.

No interferance with the cables when on the stand.

still scratching head........

hernehill69 · Oct 27, 2013

All of the above is good advice.
To help understand what component is causing the problem try setting it on the inner front chain ring and a middle gear at the back. Then operate the front mech by pulling the exposed cable with your hand. If you get enough throw to shift cleanly to the outer ring then your mech is probably OK and the problem is the shifter or cable. If not then the front mech needs further adjustment or repair.
Dave

legrandefromage · Oct 27, 2013

look how the cable is clamped - either side of the little guide

FMJ · Oct 27, 2013

Andy T":f5huvirz said:
Shifters are nice and smooth with all the required 'clicks', it seems that the third click just isn't enough to move the the mech far enough.

Put chain in granny on front and big on rear. Loosen cable pinch bolt. rotate cranks and adjust lower limit screw in until inner plate on front mech is just rubbing on the chain. Pull cable tight and tighten cable pinch bolt. Tight as in grab it with pliers just above the pinch bolt and pull it tight so there is good tension on the cable and tighten the bolt. Back off lower limit screw 1/8 turn. See if that works.

Woz · Oct 27, 2013

Andy T":3fz4hl2u said:
legrandefromage":3fz4hl2u said:

something like:

Click to expand...

Legrandefromage, can you explain the photos, all I can see is a clamped cable, what am I missing?

Ramage, 'under load' is simply slow pedalling along the flat, nothing taxing for the drive train. Shifters are nice and smooth with all the required 'clicks', it seems that the third click just isn't enough to move the the mech far enough.

The mech pivots are all good, no play in the pivots, mech moves freely manually.

No interferance with the cables when on the stand.

still scratching head........

These are misleading pictures in a couple of ways - first they are road mechs with a totally different much shorter cable pull and secondly to get more outward cage throw (which apparently you need) the cable should be the other side of the pinch bolt closer to the pivot point not as pictured. IMHO and not to *hit on LGFs advice, just fiddle with the intended cable route (usually a groove in the FD clamp area) for now until other potential issues are resolved.

legrandefromage · Oct 27, 2013

the pic was just to show how cables can be clamped differently - it wasnt meant to be an exact representation of actual mech, weather, time of day etc!

elPedro666 · Oct 29, 2013

What cranks and BB axle length do you have? If you're not sure, try measuring from the centre of the middle ring to the centre of the seat tube (the centre line line of the bike).

I'd guess at a sloppy mech being pushed too far out to cope well.

dyna-ti · Oct 29, 2013

Ring sizes :? Is it possible the jump is too large

Really difficult to know without seeing it all in operation

Roll on the age of vids ...... Hang on

Do you have a stand to put the bike on while turning the cranks and running through the gears :? Makes a huge difference to ease of set up. And the bike upside down behaves differently to when you turn it right side up.

velomaniac · Oct 30, 2013

Any riding situation. On the stand the drivetrains not under load as the wheels not pushing against a road surface.

jimo746 · Oct 30, 2013

Post a pic of your front mech/chainset setup.

One for the mechanics..or gifted in bike knowledge?

Andy T

hernehill69

Old School Hero

legrandefromage

FMJ

Woz

Old School Grand Master

legrandefromage

elPedro666

dyna-ti

velomaniac

jimo746

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