Rear shifting problems

[Mike_D]

So I developed a problem with my rear shifter on this mornings ride to work and it's beyond my limited repair knowledge to fix.

I've got a shimano rapid fire shifter. I was running through the gears and the shifter was claiming that the chain was changing gears. The chain is stuck in first gear and won't move. I move the chain manually and same results. The derailleur moves perfectly fine, but the rear tire is moving very stiffly.

Any ideas?

[cyclerUK]

If the rapid fire shifter is moving but not the derailleur then I would suspect the cable to the derailleur is broken.

See Alex's video:- how to change a gear cable.
http://bikeride.com/inner-shift-cable/