Diameter of Centre Hole around 7.6cm (76mm). Distance Between Mount Hole(centre to centre) around 6.5cm (65mm). Hydraulic Rear Disc Brake Caliper System Specification. Product Name:Hydraulic Rear Disc Brake Caliper.Hydraulic Cable Length:Approx 530cm20.86. Distance Between Master Cylinder Mount Holes (centre hole to centre hole):40mm (1.57). Complete wheel rim tyre tube + Disc +Chian Sprocket+Rear Disc Brake Caliper System. The item "Complete Rear Wheel 1.85-12 Rim 15mm Axle 80/100-12 Tyre + Brake Disc Dirt Bike" is in sale since Wednesday, January 20, 2021. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Wheels, Tires & Tubes\Tires & Tubes". The seller is "yffsmoto" and is located in Garland, Texas. This item can be shipped worldwide.