A nice quality 57mm reach dual pivot caliper brake that offers more room for fenders and wider tires.
Our ES and 700c Buena Vista frames are designed for this type of brake.
Works great for most 27" to 700c wheel conversions. Includes cartridge brake shoes.
From Interloc Racing Design.
Note that these brakes will not work with frames designed for short reach brakes (e.g. Smoothie, Rush).