We now ride an aluminum Co-Motion Roadster with disc brakes.
Tonight while on a ride, we were stopped at a light. Just being goofy I was holding the rear brake and noticing how much front to rear rolling movement was happening with the brake locked. After crossing the road, the wife asked to stop for a moment. With her off the bike, I had her hold the rear brake locked and I rolled the rear wheel with my hand in a for and aft movement. The torque load from the brake was flexing the drop out / frame tubes enough to feel this rolling motion.
My first thoughts were the brake caliper mount is loose though it's not.
So anyone else with an aluminum frame and discs seeing this or similar flex.
Any thoughts? My initial one is to run a strut or brace from the forward caliper bolt to the v brake post helping to stabilize it.