MonkeyButtRides
Registered
That's a tough one man. It's obvious to say but I would focus on what changed. There are so many things that can make a bike under or oversteer. Mostly the same things just adjustments in one direction or the other. Tire pressures and dimensions, sag, spring rates but I would just ignore all that and focus on what could have changed. Did they adjust your chain for example? If it was loose and they tighten it up, extending the wheel base could make the bike feel like its understeering. Same as shortening the wheel base will make the bike steer quicker. Like @sixpack577 just trying to throw out ideas?!?!?