Profile Racing Spider Spline Drive Single Chainring was designed to offer optimal chainline when used with a Profile Euro Outboard bottom bracket. It places the single chainring over the external bearing cup and is machined from billet aluminum plate, with a CrMo Steel adapter insert already in place. Three styles available: 4 Bolt (104MM BCD) for 19mm splined axle; 4 Bolt (104MM BCD) for 22mm splined axle; and 5 Bolt (110MM BCD) for 19mm splined axle.
