The TRP Spyre Post Mount Disc Brake Caliper is a dual sided mechanical brake where both pads actuate providing even and precise clamping force. This translates into even pad wear and, with the addition of a simple cable barrel adjuster, the pads can be adjusted easily and hassle free. All of this in an incredibly thin 40mm wide, 154g slender package that works with any of the mechanical drop bar brake levers on the market. Sold as singles - one required for each lever. TRP Spyre Post Mount Disc Brake Caliper Features Dual sided actuation for even pad wear Simple adjustment and set up Works with ALL cable actuated road levers. Includes ultra-grippy TRP semi-metallic pads Manufacturer recommends use with 160mm rotor