Waiting for my broken and repaired hip to mend so I can work on my '21 Touring, I have a question. I read somewhere that a wheel/hub is moved out, away from the backing plate, 16 times the thickness of the shim. Can that be right? Thanks.

I do believe it is something around that number from what I read. I found this out myself making shims for my TT rear end. I made something like a .020" shim and it moved the hub out a ridiculous amount. I had to order a shim stock assortment pack to make a thinner shim and get things where they needed to be.

I don't recall the exact amount... But it's more like .010" per .001" of radial shim thickness. When I machine new hubs I hold +-.010" positional tolerance relative to the brake drum flange. A small radial adjustment makes a big difference in linear position!

Just curious...question for you machinists, Whatever the correct number is, 16 times or .010 per .001, does that change with a different taper? Like something besides a T ?

Absolutely Tommy. It's all fairly simple geometry. If you know the angle you can find the radial growth of the taper based on the effective thickness of the shim... Then you can figure the axial movement relative to diameteral growth. Just a bunch of little triangles ;)

The rear axles that I have measured have all been 3/4" per foot with centerline (not just T). This is a typical self locking taper angle, and pipe thread too.

Now you have your first triangle... Hope this helps. Happy trig-ing ;)