Track Hub Front High Flange (Pro Model)Our Pro front high flange track hubs are available in 20, 24, 28, and 32 spoke hole configurations (other spoke hole count options are available upon request). Our Pro track hubs come with our Carbonyte Phil spec bearings which are our low drag bearing option which have partial contact seals and have a 30% fill with our full synthetic Phil Carbonyte grease. SPECIFICATIONS Hub shell material 6061 Aluminum Axle material 6061 Aluminum End cap material