Stan's NoTubes - Hub, Rear, Stans, E-Sync, 6B, 32H, 12X148, Ta, Shim HG stock They also have seams

They also have seams

Installs simply with one hand

high resistance to temperature increases and a limited lifespan

Not compatible with Centerlock or 100mm (non-Boost) E-sync hubs

Syncros OE Press Fit / 1 1/8"

Stan's NoTubes - Hub, Rear, Stans, E-Sync, 6B, 32H, 12X148, Ta, Shim HG stock They also have seamsStrength and durability were the main priority in designing E sync hubs. Designed for more aggressive riders, wet environments, and the added torque and weight stresses of eBikes, E sync hubs are built to last. The cromoly axle and Enduro sealed bearings of the E sync can handle high loads and harsh conditions, and the double row Enduro bearing at the heart of the E sync's freehub lasts longer than simply pairing two standard cartridge bearings side