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Rear mech sticking(5 posts)

Rear mech stickingthe flying bean
Feb 5, 2003 1:28 AM
Does anyone know what could be causing this please? My Campag Mirage rear mech has been sticking in a mid range sprocket. Usually, a bump in the road makes it shift downwards. However, it now refuses to shift downwards (to a higher gear/smaller sprocket)although it can shift to the 2 lower gears (higher sprockets). I've lubricated the cable. The mech is only 3 years / 6000 miles old. I'm from the old school of DT shifters and Nuovo Record which would work for decades, so I'm at a bit of a loss here.

Any advice would be much appreciated. Yours in sport...

The Flying Bean
re: Rear mech stickingSpunout
Feb 5, 2003 4:15 AM
You'll have to take some things apart, to find out where the problem is.

1) Unhook the cable from the RD, does it swing freely? Does the pulley get caught on a cog somehow? Is the return spring strong?

2) Shift up to a high cog, and pulling on the cable end, downshift and feel the cable feed. If it sticks, you have a shifter or cable problem. I'd get a new set of cables first, you'll then have to check your Ergos.
time for new cable housingcyclopathic
Feb 5, 2003 4:36 AM
you must ride in wet. Clean lube top piece of housing (uninterrupted from shifter) and replace everything down, it is probably contaminated. There's really no need to change cables and deal with cable stretch. While at it lube rear derailleur pivot points. Also check for bent derailleur hanger good luck
I'll try this, thanks and I do ride a lot in the wet (British)the flying bean
Feb 5, 2003 4:46 AM
Cable Bind...asphalt assault
Feb 5, 2003 5:34 AM
...It sounds like you have some crud buildup in the short loop of cable just before it enters into the rear derailleur.

What I'd do is disconnect your cable from the derailleur and slide it out of each section of housing all the way up to the shifter. Wipe the length of the inner cable with WD40 several times to clen thoroughly. Spray wd in each housing section, let it sit foor a minute to losen up the crud and blow out with compressed air and repeat a couple of times to be sure it's clean. Spray some silicone spray lube in each housing section before you slide them on the inner cable.

Another alternative of course, would be to just replace the cable and housing...but I'm from the old school too and won't throw things into the landfill until it's absolutely necessary.