- The PM-PM +20 mm brake adapter makes it possible to enlarge the brake disc by 20 mm - Example: Post Mount (PM) mount, which is designed for a 160 mm brake disc, allows a 180 mm disc to be installed - Material: Aluminium - Use on front and rear wheel - Weight: 13 g PM brake mount 160 mm + PM-PM +20 mm adapter = brake disc size 180 mm PM brake mount 180 mm + PM-PM +20 mm adapter = brake disc size 200 mm PM brake mount 180 mm + PM-PM +20 mm adapter + 2 spacer* = brake disc size 203 mm (*with one spacer disc per mounting side with a thickness of 1.5 mm) PM brake mount 200 mm + PM-PM +20 mm adapter = brake disc size 220 mm PM brake mount 203 mm + PM-PM +20 mm adapter = brake disc size 223 mm