TLR just announced the new aluminum 4mm trailing spindle for the 22. After testing the development team found that the additional trailing in the spindle provides smoother steering input therefore making the 22 a bit easier to drive. The stock spindles on the TLR has 2mm of axle trail. As with all TLR aluminum parts, these spindles are made out of a high grade aluminum, laser etched for easy identification and hard anodized for enhanced durability and great looks. The aluminum spindles also include ti-nitrided king pins for added durability.