NoTubes Flow S2 27.5″ rear wheel, 12X148 Microspline

Durability, serviceability, and value: every E-sync hub is built around these three priorities. From cromoly steel axles and double row Enduro bearings, to special heat treated steel ratchet rings and a pawl design that reduces stress on freehub and bearings, every detail of the E-sync hub is designed for durability. E-sync hubs are also designed for fast engagement, with four pawls needing only 8.18° of rotation to engage simultaneously and put power to the ground. E-sync hubs are perfect for eBikes and riders who demand stronger components, but still want the fast engagement of a high-performance hub.

The Flow S2 wheelset is available with Shimano Micro Spline, HG, or SRAM XDR freehub, and 6-bolt or Centerlock brake style, with options to fit all popular axle configurations.Tubeless ready with rim tape comes pre-installed. S2 wheels are built to last long, but also be easy to service and update with changing axle and cassette standards. Traditional J-bend spokes and lacing have a proven history of ride quality, durability, and serviceability, and matched S2 wheelsets all use a single spoke length, making it even easier to own and service your S2 wheelset for years. The Flow S2 with E-sync hub is the perfect wheelset for riders who value durability and tubeless performance.

Low-profile 30mm internal width optimizes tire shape, traction, and control for 2.3-2.6” tires

6061 aluminum with sleeved joint and stainless steel rim eyelets

Patented BST low-profile rim shape for easy tubeless inflation and the most reliable seal

Matched wheelsets use traditional J-bend lacing and share a single spoke length for easy serviceability

E-sync hubs offer fast 8.18° engagement with reinforced pawls

Enduro bearings with double-row freehub bearing and cromoly axle offer 47% increase in max torque capacity over Neo hubs