Measure the standard geometry first, then change one dimension at a time and test. Lowering the front, fitting a longer shock or changing wheel size alters rake, trail and weight distribution together.
What this job covers
Measure the standard geometry first, then change one dimension at a time and test. Lowering the front, fitting a longer shock or changing wheel size alters rake, trail and weight distribution together.
Signs you need it
The bike feels nervous, slow or unwilling to hold a line. A custom build has changed forks, wheels or ride height. The front tire wears oddly or the steering feels notchy. The bike weaves under acceleration or braking. You are planning a frame or front-end swap.
The process
Baseline measurement: Ride height, rake, trail, wheelbase and swingarm angle are measured and recorded.
Alignment check: Frame, forks, swingarm and wheels are checked for straightness and bearing condition.
Change one variable: A ride-height or fork change is made in isolation, with the effect predicted and tested.
Road test: The bike is ridden at low and normal speed, in corners and under braking. Nervousness and stability are noted.
Iterate: Further changes are made only after the previous one is understood. Geometry is not tuned by guesswork.
Document: Final measurements and settings are recorded for future service and resale.
What is included
Measured baseline geometry Frame and fork alignment check Ride-height and suspension length assessment Bearing and steering-head inspection Road-test evaluation A written record of the final setup
What affects the scope
Whether the frame is straight Fork and shock length options Wheel and tire clearance The intended riding surface and pace
How to prepare
Bring the bike in its current configuration, with the wheels and tires you intend to use. Tell us about any previous frame, fork or shock changes. Be clear about the intended use: daily road, touring, gravel or show.
Checklist
- Rake, trail and wheelbase measurement
- Ride height and suspension length changes
- Swingarm angle and anti-squat
- Steering-head bearing and frame alignment
- Wheel-size and offset changes
- Custom frame and subframe work
Questions
Can I lower a bike safely?
Sometimes, but it changes geometry, ground clearance and suspension travel. A proper lowering job compensates where possible and checks clearance at full compression.
Does a steering damper fix instability?
No. A damper can mask a symptom, but it does not correct poor geometry, worn bearings or a misaligned frame. Fix the cause first.
How do I know the frame is straight?
Measurement and a specialist alignment check. A visual inspection is not enough, especially after a crash or a poorly repaired front end.
