sale Add to Wishlist TSI SG Upright Groover TSI SG Upright Groover Re-grooving of approved truck tires has been a common process for truck, bus and fleet companies. The SG Upright Groover is designed specifically to meet this need. Most truck tires have 6/32” of under tread. Precision,... MSRP: $5,187.00 $5,460.00