(Rim Strikes can cause catastrophic failures to these rims). Many ASTM CAT 2 carbon rims have a minimum operational PSI rating, that will void the warranty if you ride below that PSI threshold (which can be 8 PSI or less). (HED alloy or carbon rims fall into this category, along with the majority of Fat bike carbon rims on the market). Often called “Winter Seasonal” Fat Bike wheelsets. Not rated for suspension or 4-season trail/AM use. (sub 230 lbs total weight of rider+gear+bike). ASTM CAT3-5 wheelsets open many doors, and remove the limitations of “riding outside the wheelsets’ intended purpose” - see CAT2 below for some of the restrictions imposed on weaker rims).ĪSTM CAT 2 - Sand and Snow only coverage. (ATOMIK and DERBY rims are all CAT 3-4-5 rated). (DT SWISS hubs can be upgraded with 6.7 degree / 54T ratchets).ĪSTM CAT 3/4/5 carbon rims are a “must have” for : 4-season, Trail / AM Suspension, 230-300 lbs rider+gear+bike total weight, or any significant jump/drops. The worst “stock” engagement ratios on “premium” fat hubs are DT SWISS 18T ratchets (20 degrees) and HED or HOPE hubs at (8 degrees). The ideal engagement ratio is as close to Zero as possible like the ONYX Classic or Vesper (0 degrees), or the Industry Nine Hydra (0.5 degrees) hubs. If we were building a custom Fat Bike wheelset design, the Design Parameter order of preference would be :Īt the core of every custom wheelset, are the hubs. A well designed and built custom Fat Bike wheelset will increase performance, and save you time and watts with every crank of the pedals, for the lifetime of the wheelset!
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