25-30 mph, 2nd gear
It's a cyclic "shutter". Started after rear tire change, and rear brake pads changed together.
Can't feel it at any other speed, or in 1st or 3rd at same speeds.
Checked chain tension, and loosened and moved rear axle fore and aft before adjusting chain tension again.
Motor runs like a top, and all feels swell at all times, but to try to maintain 25-30 mph in 2nd, I feel it through seat and pegs, but very little vibe in mirrors. Feels like it ought to be chain-related, but even running it in gear on the bike lift, I can't see anything suspect.
Any ideas?
