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Insert Selection

What is fork offset?

Fork offset adjustment is a chassis tuning variable commonly used in motorcycle racing, and the benefits can apply to bicycles as well. Adjusting offset changes the trail, which is a major variable that governs the steering characteristics and grip (just like head tube angle). Reducing offset increases trail and a slacker head tube angle also increases trail.

Why adjust offset?

There are minimal tuning compromises for offset adjustment compared to adjusting head tube angle.This is because changes to offset minimize the effect on other variables, such as bottom bracket height, seat tube angle, squat ratio, and wheelbase. 

Outsider offset crown kits are designed to allow quick and easy inserts changes. Offset can be used to tune for different courses, rider preference, wheel and tire size changes, wheel and tire mass changes, and “future proofing” your frame and fork due to the ever changing geometry trends.

Our insets are categorized relative to the stock position of your fork. The more negative the setting, the more stable the steering will be. The more positive the setting, the lighter the steering will be.


Stock Offsets

Wheel Diameter Fox 40 Stock Offset Rock Shox Stock Offset
26" 45 mm 42 mm
27.5" 52 mm 48 mm
29" 58 mm 56 mm



Insert (mm) Color Handling in - Orientation Handling in + Orientation
-6mm/+4mm Green *Stable *Light
-8mm/+6mm Gold **Stable **Light
-10mm/+8mm Orange ***Stable ***Light


What offset should I start with?

We offer the maximum adjustment range possible. If you are not sure which insert to start with, we recommend starting with a -8mm (stable) insert position. Ride a familiar track a few times, and then flip the same insert the opposite direction for a major adjustment to feel effect of a +6mm (light) offset. This will give you a reference to help make selections.