mark a. wrote:
My question is whether this would work for my wife's ex-postie bike. It's a Sturmey 3-speed with a tensioner, and I'm not sure the Rehook would be able to pull the tensioner forward and get the chain on at the same time.
Obviously the real question is why the chain came off in the first place, so I ought to have a look at that first.
the tensioner on a pashley is one that often can't be pulled forwards into the normal position by pulling on the chain alone; you need to hold the tensioner with one hand and remount the chain with the other, or something like that. It is sometimes possible to mount the chain on the chainwheel and sprocket and then hook the tensioner over the chain, but not always
this setup has some oddities;
- the guide plates either side of the tension pulley can break
- the pulley bushing is a bit poor
- the chain often needs a half-link to be set up properly (in the picture is OK for now, but it may only have a few weeks left in it before it 'flips')
- when the chain gets a bit worn the tensioner can suddenly flip about 180 degrees
- when the tensioner flips, it can (if a larger sprocket is fitted) contact the sprocket and smash itself to bits