FINNEY1973":20jmmgfz said:I have a different cage to that example, although the CTC measurements between jockey wheel spindles are the same - 4.8cm. Don't think it's on backwards; photo attached. As you can see the cage is pointing forward on 42T - 28T, which is most certainly not right! Might be easier to get a different cassette with a smaller ratio.
That was what I was about to suggest, looking at the photo the mech arm is not parallel to the chain stay Did you size your chain as big ring / big sprocket + 2 links, as a starter, on a lot of bikes in my pro mechanic days we often ended up with chain length = big ring/big sprocket +zero links Fiddle with your chain length to see if it cures the problem, so long as you get small amount of tension, on small ring, small sprocket, you should be good to go,& chain shortening will increase this anyway As an aside in the 82 worlds at Goodwood the USA time trial riders had to alter their inner chain ring size because of the weather conditions almost in the start house, on the small ring the bottom chain run looked like a superbike with the rear suspension fully compressed but they seemed not to have any problems in that respect.Midlife":3e4qdvm4 said:Hmm........."Slant Pantograph" mechs should be a bit more parallel to the chainstay than that.
Shaun