/ Bike gears problem

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Sean Kelly 19 Jun 2018

My rear dérailleur gear has jammed and refuses to move either up or down. Although the shift lever moves a bit, nothing much happens and the chain is still on the same cog. Any ideas appreciated before I take the thing apart?

wilkie14c 19 Jun 2018
In reply to Sean Kelly:

There’s a jam somewhere then, first i’d release the cable from the mech and check it pulls & releases freely. i’ve had one partially broken within the outer cable and it was pretty well jammed

LastBoyScout 19 Jun 2018
In reply to Sean Kelly:

Whatever you do, don't force the shifter - breaking the internals is an expensive mistake!

Can you move the mech by hand? It might be a bit of gravel has flicked up and jammed it.

Check the cable routing around the bottom bracket - had a similar shifting problem on my bike recently and it turned out to be crud on the cable guide, solved by a good clean and lube. While you're at it, lube everything before starting to release the cable.

blurty 19 Jun 2018
In reply to Sean Kelly:

Has the cable outer jumped out of one of the sockets along its route?

Rigid Raider 20 Jun 2018
In reply to Sean Kelly:

If the bikes isn't regularly maintained, which means changing the cable outer at the rear derailleur every six months if you ride a lot in the wet and on salted roads, it's most likely the cable has rusted in the outer. This is especially likely if you haven't ridden it for a long time. Derailleurs are pretty bomb-proof and the pivots seem to last for many years; it's cables that give problems.

Replace all cables from the handlebars back; you'll be amazed at the improvement in braking and gear shifting.

Post edited at 08:24
nniff 20 Jun 2018
In reply to Sean Kelly:

Cable's probably frayed in the shifter - they don't last forever and fray and break where the cable joins the termination.  Undo the cable at the dérailleur end - if the latter's then free to move, you can be pretty certain that the cable's frayed. 

Sean Kelly 20 Jun 2018
In reply to Sean Kelly:

Thanks for all the advice. It's either the cable or actual lever that shifts the gears as it does nothing when I try to advance the gear. It's going into the repair shop tomorrow.

Thanks again

Sean

Rog Wilko 20 Jun 2018
In reply to Sean Kelly:

I should have thought with all that experience you had winning Paris-Nice, all those Classics and Tour de France green jersey etc etc you'd know a bit more about bikes. But I suppose you had team mechanics to do all that stuff.

Hat Dude 22 Jun 2018
In reply to Rog Wilko:

It was all down tube shifters in his day

Rog Wilko 22 Jun 2018
In reply to Hat Dude:

I remember them well.

 

Dave B 23 Jun 2018
In reply to Rog Wilko:

I have literally only just upgraded from down tube shifters. 

I couldn't resist an ebay bargain. Cost me £50 all in. Need to cut down the cable outers at the front though. I got them too long, so they rub on the bottom headset.

I may have to upgrade my original Look pedals next year, I can't getget rid of the creak... 


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