2001 R1100 RL, 5200 miles (new owner). Bike sat for 12 years, with gas in the tank, and wasn’t running when I purchased it. Replaced fuel delivery system, fluids changed, new tires, relined fuel tank and a few other things. Since getting the bike running, I’ve rode it 200 miles and recently synced the throttle bodies. No issues until this past weekend. A friend was giving it a test ride and advised he almost crashed when down shifting at about 35-45 mph coming to a stop. He explained he was traveling about 70 mph when he noticed the car in front of him braking. He reduced speed and began downshifting. He doesn’t recall the gear he was in but at approximately 40 mph the MC cut completely off and the rear tire locked up and the bike slid until he pulled in the clutch at which time the rear tire unlocked and rolled. While continuing to hold in the clutch he pressed the start button and it cranked with no problem. What the heck happened. Can these bikes lock up like that even when you are traveling within the appropriate gear range?