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Frame Compatibility

  • All insert positions are compatible with Boxxer forks and all frames.
  • For Fox 40 forks and extremely low offsets, some frames with large diameter head tubes may contact the arch at bottom out. If you have this issue, there are 2 ways to address it:
1. You can avoid running low offsets that will contact your frame.
2. You can also extend the fork stanchions in the clamps.


*Always check the full travel of your fork when running a new offset for the first time to ensure that there are no contact points between your fork and frame. Failure to adhere to these compatibility limits will void the warranty and can result in severe injury and death, as well as damage to your bicycle. 

The Boxxer arch has plenty of clearance with -10mm insert as shown below.

The Fox 40 arch overlaps the frame at bottom out as shown below.

As shown below, this frame and the -10mm insert has clearance. However, some frames with larger head tube diameters will cause the arch to contact the head tube!

If your frame hits with the -10mm insert, you can run less aggressive inserts until you have clearance as shown below.

Offset (mm)  Maximum Head Tube Diameter (mm)
-10 61
-8 65
-6 69 


If you really need to run the -10mm insert, you can also slide the fork out in the stanchions as shown below.