Polished hydraulic brake master cylinder. Compatible with 1" handlebars. PM recommends the use of 9/16" bore with all 4 and 6-piston single caliper set-ups.

Note: The use of the small 125x2 2-piston caliper is not recommended for regular street use. If you insist on using the small calipers, PM advises the use of 9/16" bore handlebar master cylinders with both single and dual caliper set-ups.

Note: Switches & switch housing must be purchased separately