For 2019, Profile Racing is offering Monthly Madness Sales that will change throughout the year.
First up, the Madera Helm Sprocket:
HELM SPLINE DRIVE SPROCKET
-The Madera Helm Spline Drive sprocket is manufactured from 7075 Aluminum in the USA. This sprocket requires no sprocket bolt. Instead, it has a hardened CrMo steel insert in that matches up to the 48 splines on the BB axle for pure, direct power transfer.
-Available for 19mm and 22mm splined axles.
-Supplied with a splined steel insert.
Sizes: 25t & 28t with 1/8″ tooth width.
Colors: Nickel, Rust, Fall Red(Matte Red), and Snow.
Weight: 81g/285 oz (25t)
NOTE: Spline drive sprockets are not compatible with 2-piece cranks for Right Side Drive (not enough room for splines). Spline drive sprockets are compatible on Left Side Drive 2-piece cranks though.