Hubs

MTB Hub Buying Guide

The hub is the rotating centre of the wheel — bearings, axle, and (on the rear) the freehub mechanism that drives the wheel when you pedal. Hub quality affects how long the wheel lasts, how it sounds, how quickly it engages, and which cassettes it accepts.

Engagement

Engagement speed — how many degrees of pedal rotation before the freehub catches and drives the wheel. DT Swiss 18-tooth star ratchet gives 20° engagement, upgradeable to 36T (10°) or 54T (6.7°) with a £30 ratchet swap. Hope Pro 4 and Pro 5 offer 5° with their 44T ratchet ring. Industry Nine Hydra has 690 points of engagement (0.52°) — essentially instant. Faster engagement matters most on technical climbs where you need power the instant you push the pedals. For general trail riding, anything under 10° feels responsive.

Bearing Types

Sealed cartridge bearings (the standard on quality hubs) are pre-packed with grease and shielded from contamination. They're replaceable when worn — a £10-15 bearing set makes the hub feel new again. Loose ball bearings (cup and cone, used by Shimano) are adjustable and serviceable but need regular maintenance. Chris King hubs use proprietary angular contact bearings with a distinctive buzz — serviceable and extremely long-lasting.

Freehub Bodies

Shimano HG (most 10/11-speed cassettes), SRAM XD (12-speed Eagle), Shimano Micro Spline (12-speed Shimano). Hubs from Hope, DT Swiss and Industry Nine accept swappable freehub drivers — buy the hub once, swap the freehub body if you change drivetrain. Budget hubs from Shimano and Formula typically have fixed freehub bodies that can't be changed. If you're investing in a quality hub, swappable freehub bodies are a feature worth having.

Sound

Hub sound is a surprisingly emotional topic. Hope hubs have a loud, aggressive buzz. DT Swiss star ratchets are quieter, with a smoother sound. Chris King has its distinctive "angry bee" ring. Industry Nine Hydra is loud and proud. Shimano cup-and-cone hubs are near-silent. Sound doesn't correlate with quality — it's purely a function of the ratchet mechanism design. Pick the hub that performs how you need it to. If the sound matters to you too, that's a bonus.