Trying to sort out a bike for a friend out of old bits and bobs. Everything working well other than the rear shifting, which I can’t seem to get working smoothly.

Now gears are never my strong point but I can usually get them working pretty well, but not this time round. Trouble is the bike is getting made up of old parts, and unfortunately I realised I didn’t have a spare mtb rear mech.

So I’ve tried to bodge a tiagra 9 speed 4500 rd, together with a 11-36 cassette and 9 speed slx shifter. Reversing the b screw has helped, but am i wasting my time with this combo and do I need a new rear mech?

Or is a visit to the bike shop for proper set up going to sort my woes…

ta

Is the 11-36 cassette a 9 speed? It sounds like a more common size for a 10 speed cassette.

Tiagra mech wont work with SLX shifters. The road and mtb stuff in Shimano have different cable pull ratios.

The road and mtb stuff in Shimano have different cable pull ratios.

For 10 speed you are correct but 9 speed road/mtb is the same.

Bollocks.

Cable pull is the same on road and mtb REAR up to 9 speed.

Tiagra rr mech rated to 32T only tho IIRC