• Single main 6-groove with 3-groove front accessory drive black anodized to 62 rockwell hardness

• 2-piece inter-locking R-LOK modular system design allows you to change drive pulley diameter quicker at the track

• R-LOK crank system allows for an endless amount of crank pulleys to be stacked and locked together providing a more positive and lightweight drive than a conventional mandrel system

• R-LOK system is more concentric and truer than the conventional pin-drive systems

• Crank adapter fits all the pulleys so it reduces cost of replacing damaged pulleys

• Pulleys are stackable and will adapt to pin drive Gilmer and HTD pulleys

1:1 Setup (4" water pump pulley, 4" crank pulley)

15% Reduction (4" water pump pulley, 3.5" crank pulley)

25% Reduction (4" water pump pulley, 3" crank pulley)