Spidertrax Pro Series 60 Knuckles with "mid" steer arms (3.5") winner Dimensions:

Dimensions:

Ultimate Strength – Hook Throat Opening: 31

3 inch safety harness

Proper installation and consistent use of restraint system is critical to your safety in event of accident

Ultra4 has grown well beyond the performance of those days of early racing

Spidertrax Pro Series 60 Knuckles with "mid" steer arms (3.5") winner Dimensions:Light as always. Stronger than ever. Spidertrax introduced their first fabricated knuckle over 5 years ago. Today, the Pro Series 60 Knuckle takes professional rock racers to an all new level. Better materials, bigger bearings, & larger bolts make this the strongest knuckle yet. All while holding the same compact & lightweight design philosophy you have come to expect. This Pro Series Knuckle is designed to install on a Spider 9 Housings w 3 1 2" OD