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As the 20mm wide 66 Tooth OBD Pulley is supported / mounted on the axle with a press fitted bearing, when you then include the 2x bearings in the wheel, there are therefore 3 points of mounting contact on the axle in the assembly of the Motor drive when fixing to the wheel giving a very nice well balanced secure fit ensuring maximum performance at all times.
The power of the TRAMPA Motors is huge & to have the power spread across the axle is important to the delivery of smooth performance...
The 66 Tooth Pulley needs to be correctly positioned on the axle to ensure the belts align perfectly with a 9.5mm spacer.
So if you don't already have one, then you WILL NEED a 12x 16x 9.5mm Spacer to position the pulley & wheel in the perfect location on the axle to acquire maximum Torque
You may also need some M4 x 20mm Hex spacers & M4 x 10mm Dome Head TORX Bolts to fit this pulley to your wheel....
As this Pulley has 5 spokes, it is specifically designed to only fit to any the 5 spoke hubs that TRAMPA produces. So TRAMPA's SUPERSTAR 8 or 9 inch Megastar & PHATLADS hubs...