Will these spikes fit all wheel sizes?

The spikes are removable and universal to the nut body — they're not wheel-specific. The M12 x 1.5 nut itself is what matters for fitment to your vehicle's hub.

Do I need to torque these differently than stock lug nuts?

Torque spec depends on your vehicle's hub — check your service manual or owner's manual. Aluminum nuts seat the same way steel ones do, so the spec won't change.

Can I remove and reattach the spikes multiple times?

The design is built for removal, but repeated on-and-off cycles on the same nut can wear the connection. Plan for occasional swaps rather than every week.