Spider shims for the 2016,17 Arctic Procross are a different diameter and fit than earlier models. Note, these shims are not for 2018 type roller bearing clutch.

 

Using different thickness and diameter shim washers under the spider is something racers sometimes use for belt grip and engagement characteristics. Using a thicker large diameter part "un-tucks" the flyweight at engagement. This increases leverage and belt grip, it does also often lower engagement. The amount varies based on the springs and flyweight profile and weight.

The small diameter part of the shim increases belt side gap and also therefore does effect the leverage position of the flyweight at the point of belt contact. Spider shims are not set in stone for the amount of change.

 

FAQ: "which one is best for me?"

Answer: -There are many other variables like belts (compound and width) and flyweights and springs that mix into the effect. This is a tuning part that racers and experienced tuners test with and use to determine which one is best for their purpose at hand. Engagement requirements, belt grip for hp levels, and applications like drag racing/traction are among things to be considered. Special tools and experienced shop personnel are required for installation. With a part like this you are either using it at the request of a pro performance shop for a specific package, or doing testing on your own.

 

The following spider shims are for the 2016+ Arctic Procross models with Team primary clutch. The large diameter step is the first thickness listed