Quote:
im not sure the 5x7mm shims are best replacement for the N13 spacer. I dont have the car with me now, but I'm pretty sure the N13 spacer is there instead of shims, is cos the shims would contact both the inner race and side plate of the bearings, which you dont want. You want a spacer(N13) that will only contact the inner race of the bearing for more efficiency.
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Shims are small enough to contact just the inner part.
I know I'm using them already.
And I know the principle you're worrying about. It's the same principle as the cone on the old 12th scale belleville washer arrangement on RC12L3, etc. The cone has to touch the inner part of the race only.
I wouldn't have posted this advice if it wasn't sound and already proven.
Scott - don't worry mate, shims I've quoted are fine.
I take it "Fastinfastout"

is just living up to his name...
Anyway, FastinFastout is right - as long as whatever you shim with, isn't touching the outside of the bearing, it'll be fine.