Spline Drive Sprocket/Spider Install



Hubs-Wheelbuilding	Hubs-Axles	Crank Installation	Spline Drive Spider

When mounted to a fixed gear bike, a standard BMX crankset has a major problem- the forward and backward pressure on a conventional BMX crank's sprocket bolt saws at the the bolt and loosens it, which tends to damage the sprocket quickly. The spline drive system is an ideal way to solve that, since it places all of the force that had been on one bolt, and transfers it to the 48 splines of the bottom bracket spindle- the same 48 splines that hold the cranks in place.

Installation

Keep in mind, the object isn't to slide the spider all the way down the splines, it's just to get it pressed onto the spindle far enough so that you can start the crankarm on with the crank tool.

This is what you need. A Spline Drive Spider or Sprocket, a spindle, 3 flat washers or equivelent width of spacers, your crank bolt, and an 8mm allen key. Before you begin, you should apply Anti-Sieze or grease to the splines, so that you'll be able to remove the cranks from your bicycle when the time comes.
Take two of the flat washers, your crank bolt and washer, and snug the bolt and washers onto the spindle as shown. Make sure you have the washers centered as best you can, so they do not mark the spider or sprocket outside of the area that the crank arm is going to cover anyway.
Tighten to bolt down all the way. If you hold onto the washrs as you tighten, they shouldn't rotate against the spider or sprocket and mark it. When the bolt stops turning, remove it. The sprocket/spider should be more or less flush with the end of the spindle at this point.
Place the third washer on the bolt and tighten it down all the way again.
This will leave you with about 5mm of spindle protruding from the sprocket/spindle, which is more than enough space to get the crank arm started.
Place the crank arm on the spindle, thread on the Profile Crank tool, and tighten it down. Congratulations, you've done it.

Please contact us with any questions.