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NTN KJ20X26X20.8 Bearing Service
Wheel bearings : NTN SNR, different generations of wheel. 3 rd generation bearings incorporate two mounting functions: attachment to the chassis and the fixing to the disc brake and the rim of the wheel by the flanges incorporated into the inner and outer rings. In addition, the integration of the bearing in the vehicle can also provide a transmission function in the case of a driven wheel (drive provided via the spline in the bore).
Ceramic Bearings vs Steel Bearings... An Engineering Opinion
Bearing seals come in 4 generic types. There are open bearings - these have no seals, metal shielded bearings - these have a metal strip over the bearing cage, non contact seal bearings and fully contacting sealed bearings. In the bicycle industry, bearings generally have non contact or fully contacting seals.
SKF vs. NTN - fully sealed bearings - Weight Weenies
NTN's bearings for the higher end products do have tighter tolerances. For the hubs I am going to have made getting hold of ntn bearings is difficult so SKF's will be used but each one gets measured and and selected to a tighter spec. Thus ends up being a cheaper way to get nearly ntn level bearings but without the difficulty of buying them.