The FLT-3 combines the metal axle spacers of the FLT-1 with the unmatched grinding feel, light weight and strength of the FLT-2 frame. Even with the axle bolts tightened all the way the wheels are still spinning freely and everyone on our team was blown away what a difference it makes and how much faster these frames are.

All UFS system frames fit on all UFS system skate boots. No matter the sizing. The distance between the mounting bolts is always the same

The size of the frame does only vary in lenth.
Size S = 245mm from front to back axle, usually meant for shoe sizes below eu40

Size M = 255mm from front to back axle, usually meant for shoe sizes between eu41 and eu42

Size L = 268mm from front to back axle, usually meant for shoe sizes above eu43