Originally Posted by rcompart

Anything made of metal that has a temper has a yielding point that has be be met. When you over stress something past it's yield point, you permanently deform it. Some metals like aluminum will not rebound at all after this point, other metals like spring steel do and it's this process that is what makes everything work with this pulley. If we didn't, it would never meet this yield point and would continue to deform until it met this point. That being said, if you pull this thing an inch apart, you're well past the initial deforming and it will not spring back.

The pulley is going to slip during the first few miles. The exact number will be different for every car as no one will drive the car exactly the same during the first 50 miles but it was before this point that every pulley tested was where it needed to be and usually with only the 0.33 shim and 50 miles is a good solid number that people will remember.

Refer to the first reply above.

You are correct in that the bearing is smaller but it's loading characteristics will be the same or better than the original larger one as we are moving it's center of mass farther onto the shaft and as a result, putting the load closer to the point of off-axis loading (where the clutch and clutch plate meet) and that will actually minimize what very little wear the pulley saver kit would add.

Thank you for your observation. Aside from aesthetics and people's piece of mind, the recess of the rivets pose no increase or benefit over those that were flush like the prototypes but everyone has pointed it out with worry so that part of the design was revised.

My personal preferences are Speedriven and InMotion as I have directly had great success tuning with them both but that is not to say there aren't other competent tuners out there.