PM, Radial 9/16" hydraulic brake master cylinder, gold Ops

Compatible with 1" handlebars. PM recommends the use of 9/16" bore with all 4 and 6 piston single caliper set ups. Works with OEM housing. Note: The use of the small 125x2 2-piston caliper is not recommended for regular street use. If you insist on using small calipers, PM advises the use of 9/16" bore handlebar master cylinders with both sinlge and dual caliper set-ups. Note: A brake light switch must be purchased separately (MCS 599238 or 599233). Note: An optional mirror mount clamp is available as 599236 (Black Ops) or 599237 (Gold Ops).