17mm ID x 1/2" wide, 1.37 x 24 tpi RH with 4mm keyway, Freewheel Sprocket Adaptor.

NOTE:  If you need the larger 6mm key way cut you MUST add this item to your cart and we will re cut the
key way to the larger 6mm key or to the 5mm key way.

Re cut Key way to larger size

CNC machined for the single, dual or multi speed Right hand threaded freewheel sprockets.

Held in place by two 17 mm Ext. snap rings or by other means. 

Used on our Crank Shift kits.

Be sure and order the following if needed.

CLICK HERE to order 4mm x 4mm x 20mm long Metric Key

CLICK HERE to order 16 mm Flat Washer has a 17.15 mm ID x 29.65 mm OD x 2.90 mm thick, Zinc Plated.

17 millimeters = 0.669291339 inches.

To find all the types & sizes of adapters - adapter - adaptor - Track Cogs - Lock Rings - Track Cog & Three Prong Sprockets: 

Type " FWADP " in the Search box.