like dojj says, they're a larger calliper........ but the same size piston IIRC
plenty of lads about breaking ST170's. Steve (1-PD) on here probably has a set somewhere.
I have a set in the garage you can have for free if you cover postage. I'll just have to double check they're in ok condition.


Carltios, it's difficult to say. But there's definitely more room with the ST calipers. It's quite often dependant on wheel offset.