Wheels, tyres and axles
I currently only stock 1:64 wheel, tyre and axle sets by three brands - Greenlight Wheel & Tyre sets, M2 Machines Auto-Wheels (which include other bits too) and Tarmac Works wheel and accessory packs.
All are rubber tyres (or "Real Riders" in Hot Wheels lingo). This page contains all in stock items from those series.