Surly Ultra New Disc Rear Hub.

Features:

• Threaded for fixed gear track cogs
• 6061-T6 forged hub shell (same as the Surly New); 6901 bearings
• Axle is quick release and bolt-on compatible
• Stainless 6mm bolts are included; quick release skewer is NOT included
• 4130 chromoly axle and stainless cones; aggressive knurling on cones and bolt caps for reduced slippage
• New axle/cone system uses uses a specific shouldered axle that allows the hubs to be completely adjustment free and simple to service

Specifications:

Position: Rear

Brake Type: Disc Brake (6-Bolt)

Axle Type: Bolt-On

Hub Spacing: 10 x 135mm

Drive Type (Rear Hub): Single Speed

Spoke Count: 32H

Spoke Type: J-Bend

Left Side Flange Diameter: 58mm

Right Side Flange Diameter: 58mm

Left Side Center to Flange: 34mm

Right Side Center to Flange: 38.5mm

Bearing Type: Sealed Cartridge

Color: Black

Weight: 378g

This product is expected to become available for purchase on Tuesday, December 16, 2025