Mini John Cooper Works JCW R55 R56 R57 R58 R59 Front Rear Brake Discs Grooved & Mintex Pads. Front Discs Specification: Vented - Studs 4 Disc diameter 316.0mm Disc thickness 22.0mm. Overall height 45.0mm Centre diameter 64.0mm. Rear Discs Specification: Solid - Studs 4 Disc diameter 280.0mm Disc thickness 10.0mm. Overall height 44.0mm Centre diameter 64.0mm.If your fitment is not listed, check our other items and our shop. Saturday deliveries can be arranged at an additional cost of o15. IV, HS, KA27-28, KW, PA20-49, PA60-78, PH17-26, PH30-44, PH49-50, ZE, TR21-25.