The R30 is part of our 30mm spindle line of cranks which also includes the M30, A30 and G30 models. The "R" stands for road and the "30" is for the 30mm spindle. Made here in our shop, the R30 draws on over 30 years of crank manufacturing experience with a focus on all the White Industries hallmarks; functionality, durability, and clean design. The best way to describe this model is, "It's a White Industries road bike crank".