speed and UHR rebound is unlike any other

56mm is a great all around park wheel set

From the Manufacturer: The FR1 310 are equipped with a 230mm frame

5/8″ Black Allen Bolt

FR1 (all versions) / FR2 / FR3 / FRW / FRX

Rollerblade Black Green - 243 or 255 4x80mm Frames - Set of 2 - Sale Size:Size 2: 243mm - Boots under size 12 speed and UHR rebound isThe 243mm frame with a 4x80mm is designed for efficiency and versatility. The 243 extruded aluminum frame provides torsional rigidity and advanced maneuverability. Hardware included: (8) racing axles, (4) mounting bolts and a 4mm Allen Key. These frames are made of extruded aluminum, making them lightweight, durable, and great for power transfer. Perfect for urban and freestyle skating as they can take the heat from the streets while still letting you