shimano sora rear derailier b screw

[TAV]

Hi ive got a shimano sora derailier the jockey wheel cage is rubbing the cassett at the lowest sprocket ie 28 ive adjusted the b screw all the way down to the bottom but it still rubs anybody had this problem.

 

[PpPete]

Chain might be too long?

 

[TAV]

The max its supposed to be is a 12 27 on a compact but ive got a 52 39 and a 12 28 do you think that's the problem

 

[gwhite]

Change the screw for an Allen-headed one (more durable anyway) of longer length and see how it goes.

 

[TAV]

Ive turned it around and its doing the job cheers for the advice anyway.