The Harley-Davidson VRSC, or V-Rod, is a line of V-twin cruiser motorcycles made by Harley-Davidson from 1999 until 2017. They are often called muscle bikes for their relatively high power output. The V-Rods are the first street motorcycles made by Harley-Davidson with overhead camshafts and liquid cooling.

A V-twin engine, also called a V2 engine, is a two-cylinder piston engine where the cylinders are arranged in a V configuration and share a common crankshaft.