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The diagnostic check, explained

Fifteen minutes of inspection can save a lot of guessing.

This page walks through what the free diagnostic check actually looks at, why each item matters for a commuter bike specifically, and what happens after the findings are shared.

Why inspect before repairing

Symptoms and causes are not always the same thing.

A clicking sound while pedalling could come from a worn chain, a loose pedal, a dry bottom bracket, or a rubbing brake pad. Guessing which one it is, without inspecting, risks paying for a fix that does not address the actual noise.

The diagnostic check exists to separate symptom from cause. It is done on a stand, with the wheels spinning freely and the drivetrain running through its full range, so the mechanic can isolate exactly where a noise or resistance originates.

Mechanic checking the battery contact points on a pedal-assist e-bike frame

What gets checked

The inspection points, grouped by system

Each area below is checked and noted, whether or not it ends up needing attention.

  1. A

    Braking system

    Pad thickness, rim or rotor wear, cable tension, and lever travel. Braking is checked first because it is the most safety-relevant system on a commuter bike.

  2. B

    Drivetrain

    Chain elongation, cassette and chainring wear, derailleur alignment, and shifting accuracy across the full gear range.

  3. C

    Wheels and tyres

    Spoke tension, lateral trueness, hub bearing play, tyre tread depth, and sidewall condition.

  4. D

    Contact points and frame

    Headset play, stem and handlebar tightness, saddle rail condition, and a visual check of the frame for cracks or corrosion at weld points.

After the inspection

What you actually receive

The outcome of the diagnostic check is a conversation, not a fixed invoice pushed across the counter.

  • A plain description of what was found, avoiding unnecessary technical jargon unless you want the detail.
  • A distinction between urgent and optional items, based on safety impact rather than upsell potential.
  • A rough time estimate for each repair, so you can judge whether same-day completion is realistic.
  • The option to decline any or all suggested work without pressure to proceed immediately.

Curious what your bike would show?

Request a quote first so we have some background, then bring the bike in for the inspection itself.

Request a Quote