ts1412

Hello all
Pardon my ignorance or stupidity, but I just ordered a set of wheels and was going to install it once I get her back from the shop (axle replacement due to clunking) and I noticed four of these pieces that slide into the hub of the rim.

What are they? Do I need them?

Thanks all!

Edit:

+15 front. 9 width
+20 rear 11 width

Attached Images

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