When using 1.630" it is essential to have proper clearance and tunnel protection.
 
Competition use only
 
These are 5/16" and come with Big Nuts.
 
Features:
Through-hardened carbon steel stud for ice, snow and grass drags
Flat, steel tip grabs surface area and propels across the finish line
Woody's unique designed track-trapping head provides unbeatable stud rigidity and support
For use in two-ply tracks and support plates
 
Sold in packs of 48.  Pricing in CDN dollars.