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HELIUM JAM YELLOW 83A 64mm Hardness: Hi-Rebound 83A Diameter: 64mm Compound: Cast Urethane Hi-Rebound Compound Formula Wheel Info: Hub = Yellow, Tread = Clear Yellow The HELIUM Jam Wheels are the result of a long term research project which has produced very High Performance Indoor/Outdoor wheels. Helium Wheels are specifically designed for Roller Derby and Jam Skating, where Hi-Rebound and Good Roll are needed in combination with incredibly Tight Grip. (High Rebound means the wheels can roll over some small obstacles or rocks without stopping cold.) What a smooth ride! Roll-Line has developed this wheel giving it properties that are normally not achievable in the one wheel, Super Tight Grip and Good Roll. Roll-Line based the design of the wheel on a Large Rigid Hub and a Smaller, Thinner Tread, and produced one of the TIGHTEST, and Good ROLLING Indoor/Outdoor wheels available. Roll-Line has developed the Hub which is incredibly Strong, very Light, and with extremely Close Tolerances for Roundness, Trueness, and for the Cage where the Bearings and Spacers are mounted. The Roll-Line HELIUM Tread is a Cast Urethane Hi-Rebound Compound Formula, which is just a small amount harder than the discontinued HYDROGEN wheel was, yet it provides a very Tight Grip, with a minimum of tire compression that is normally associated with a wheel this tight. The lack of tire compression, along with the thinner tread, mounted on the Roll-Line Hub, is what provides the very Good SMOOTH Roll. The Yellow Hubs glow under lack Light ? It is almost always recommended to use spacers in the wheels, when using standard 7mm bearings. Long ago, before the use of Lock Nuts (the nuts that have the Nylon Plastic inserts) to hold the wheels on the axles, Jam Nuts were used, but when the spacer was not as wide as the web of the wheel, or the wheel was not machined accurately, the bearings would lock up, the nut had to be tight, and could not be acked-off ? This method, of locking the Axle Nut down, did promote proper bearing alignment and did increase the diameter of the axle from 7mm to approximately 14mm, because everything was locked down, which also saved the problems of bent axles. Today we do use Lock Nuts. It is still very advisable to lock everything down (especially for FreeStyle, Jam, and Roller Derby Skaters). Properly locking the Wheels down when using standard bearing types, will also promote longer bearing life.
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