// Knowledge base
Workshop guides
Plain-English answers to the things riders ask us most. Chain wear, race sag, fork seals, top-end intervals. Written by people who actually turn the spanners, not a content farm.
Race sag setup — how to measure and set sag on a dirt bike
Sag is the first setup job on any dirt bike, and the one most riders get half right. Here's how to measure both sag numbers properly, what they're telling you, and what to do when the spring won't get you there.
Updated 23 May 2026
Air filter service — the cheap part that saves the dear one
The air filter is the cheapest part on the bike. The engine behind it is the dearest. Here's how to clean, oil and seal one properly — and why a five-minute job saves a top-end.
Updated 15 May 2026
Brake pad and disc wear — when 'worn out' isn't worn at all
Most brakes that feel finished aren't worn out — they're glazed, contaminated, or full of air. Here's how pads and discs really wear, and how to tell the difference.
Updated 15 May 2026
Wheel bearings — the cheap part that quietly wrecks your hubs
A wheel bearing rarely seizes — it goes slack and notchy for months first, and a worn one chews the hub and lets water in. Here's how to catch one before it costs you a wheel.
Updated 15 May 2026
Suspension service intervals — why your forks fade before they fail
Suspension doesn't break. It fades — slowly enough that you adjust your riding and never notice. Here's the service clock for forks, shock and linkage, and how to read what your bike is telling you.
Updated 15 May 2026
Fork seal leak — when to swap, when to ride it
A weeping seal is not the same problem as a blown one. Here's how to tell which you've got, the trick that buys you a weekend, and when oil on the rotor means you stop riding.
Updated 14 May 2026
Chain and sprocket wear — when to replace, and why you replace them together
Your chain is the cheapest part of your bike that can wreck the expensive ones. Here's how to tell when it's done, what to read off a sprocket, and why you don't replace one without the other.
Updated 12 May 2026
// Dealer notes
Notes for closed-dealer customers
When a UK KTM dealership shuts, the bikes its customers ride don't. We publish notes for the riders left without a local showroom.
Loughborough / Leicestershire / East Midlands
Redline Motorcycles
Closed 2025
KTM dealer since 1991 — one of the longest-running in the country. Also GASGAS, Beta, Fantic and CFMOTO. Parts that keep the bikes moving.
Read the note
Cheshire / Wirral / North Wales
Chester KTM
Closed 2024
Stanney Mill Lane dealership that served the North-West. Custom 890 Adventure Dakar Edition builder. Parts that keep the bikes moving.
Read the note