This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
SB, SBT, GCC, RCC, DSE DSS, SE, X* systemsSealed bearingOuter Alloy side cap
Sealed bearingOuter rubber seal
Outer steel CP finishing dustproof capRubber sealHi level of loose balls hubsSmooth rotation and long durabilityCrMo Threaded axle
751DSE
Outer rubber seallnner rubber seal
751DSS
751SE
751
Single sealed version of loose balls typeUsed basic material for cap. Cone and ballsThreaded axle
Basic version of loose balls typeUsed basic material for cap. Cone and ballsThreaded axle
751SB
7 51SBT
7 51RCC
*X...HubNo. Without Code Extension (hub: 751)
Cone with inner steel cap
lnner rubber seal
Outer rubber sealCone with inner steel cap
Double sealed version of loose balls typeUsed basic material for cap. Cone and ballsThreaded axle
Double sealed version of loose balls typeUsed basic material for cap. Cone and ballsThreaded axle
High End Sealed bearing typeSmooth rotation and long durabilityNon Threaded axle
Sealed bearing typeSmooth rotation and long durabilityCrMo Threaded axle
7 51GCC
Outer steel CP finishing dustproof capRubber sealHigh end ball bearing hubsVery smooth rotation and durabilityGCC design similar to sealed bearing level
Extra hard steel cone, high polished friction areaExtra roundness high grade steel ballsExtra hard steel cup, high polished friction areaGCC = Ground Cup & Cone
Special hard steel cone, super polished friction areaSpecial hard steel balls, with perfect round profileSpecial hard steel cup, perfect polished friction areaRCC = Rollground Cuo & Cone