For flywheels in this form factor, these FTW wheels are an excellent offering. I don't have a chrono graph, but I used a pair in a DevilZ Concept Pistol with Honeybadgers on 2s, and had good ranges but more importantly I was able to fire the blaster as fast as I could pull the trigger, which made it a blast to use.
I must note that in the first pair I received, one of the wheels was imbalanced and unusable, but when I contacted OOD customer service, they immediately sent me a new pair that was working perfectly. Excellent customer service as always.
Works as I'd hoped, will be buying more next time I need a pair in a build.
Used da blue ones in a Falcon which was modeled by Ansuzalgiz. Turned out very nice. Hitting about 90 FPS on honey badgers on 3s.