TRAMPA's HYPA hub is the lightest and strongest 3.75inch hub on the market! Its available in many surface finishes to suit your personal requirements and will fit to any 10 or 12mm axle. The Trampa HYPA hub can easily handle high inflation pressures increasing roll speeds for the insane amongst us - during testing Team riders went well beyond 80psi! Fit Trampa REDs or BLUESs - ABEC 5 rated top quality Bearings which are only £10 when purchased with a complete set of 4 hubs. To fit to 10mm axles use either bearing reducer sleeves or 10mm REDs bearings. HYPA will hubs fit to all known 8 inch (inflated outer diameter) tyres on the market, including MBS and SCRUB tyres.