I swapped out the wheels and tires on Luci today in preparation of a ~2000 mile trip around Arkansas. After getting everything back together and the wheels aligned, I was pumping up the rear brake and noticed the wheel was wobbling when getting onot and again getting off of the brake. I had left the spacers for the spare set of wheels in my tool chest. Off with the wheel and in with the spacers. It could have been much worse if I had left for the trip without the rear spacers.