Suspension Forks

Suspension Fork Buying Guide

A suspension fork is the most impactful single upgrade on a mountain bike. Moving from a basic coil fork to a proper air-sprung unit with decent damping changes how the bike handles, how fast you can ride rough terrain, and how your arms and shoulders feel at the end of a ride.

Understanding Fork Travel

Travel is the total distance the fork can compress. More travel absorbs bigger hits but adds weight and raises the front end. Match travel to how you actually ride, not to the biggest number available:

• 100–120mm: Cross-country. Light, efficient, fast on smooth singletrack.
• 130–150mm: Trail. The UK all-rounder. Handles roots, rocks and the odd bike park visit.
• 160–170mm: Enduro. Built for sustained rough descents while still being rideable uphill.
• 180–200mm: Downhill and freeride. Maximum control at speed on the roughest terrain.

Stanchion Diameter

Thicker stanchions mean a stiffer fork that tracks better through rough sections:

• 32mm: XC forks. Light but flexy under hard braking.
• 34–35mm: Trail forks. Good all-round stiffness.
• 36–38mm: Enduro and gravity. Noticeably more precise on steep, rough terrain.

Damper Types

The damper controls how quickly the fork compresses and rebounds. Budget forks use open-bath dampers, which work fine for casual riding but fade on long descents. Higher-end forks use sealed cartridge dampers:

• Fox GRIP / GRIP2: GRIP is solid for trail. GRIP2 adds independent high and low-speed compression and rebound — the gold standard for tuneability.
• RockShox Charger 2 / 3: DebonAir spring platform paired with a sealed damper. Charger 3 improved small-bump sensitivity significantly.
• DVO OTT: Off The Top technology adjusts initial stroke sensitivity independently of main spring pressure. Great for lighter riders.

Inspecting a Used Suspension Fork

• Stanchions: The single most important check. Look for scratches, pitting or marks in the coating. Light surface scratches are cosmetic. Anything you can feel with a fingernail will chew through seals and cause oil leaks.
• Play in the bushings: Hold the front brake, grab the fork lowers and push forward and back. Any clunking or movement means the bushings are worn.
• Damper feel: Compress the fork slowly. It should feel smooth with consistent resistance. Harsh spots, clunking or a lack of damping suggests the damper needs a service or rebuild.
• Seals and CSU: Check where the stanchions enter the crown (crown-steerer unit). Creaking here on a Fox fork is a known issue that requires a CSU press or replacement.