Cold forged and fully CNC-machined from several high-strength aluminium alloys, new Box One Stem Locks offer peace of mind and a level of added protection against losing your front wheel and fork legs in the event of a broken steerer tube.

All new Box One Stem Locks are backward compatible with existing Box forks and may work with forks from other manufacturers..

1 inch Box fork: XS, XE
1-1/8 inch Box fork: X2, XL
1-1/8 to 1.5 inch Box fork: X5

Material 7075-T6 (post), 2014-T651 (base)

Extension Maximum 230mm / Minimum 175mm