![KRC Pro Series R-LOK Serpentine Crank Pulley Only (4") KRC Pro Series R-LOK Serpentine Crank Pulley Only (4")](https://cdn.performancebodies.com/pbfilestore/PartsCatalog/imgPar552597_1.jpg)
![](https://cdn.performancebodies.com/pbfilestore/MiscDocs/imgOvrblank.png)
• 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
4.0" pulley - 1:1 Setup (KRC38240000)
3.5" pulley - 15% Reduction (KRC38235000)
3.0" pulley - 25% Reduction (KRC38230000)