Sturdy construction

tires will not grab or seize onto metal rims

Size: 21mm x 21

Overall Length w/out Approach Ramps: 193-1/8in

Seat cannot blowout if seal fails

Amermac Backing Plate for Hub Centric Truing - HBP-001 Brand_Fountain Industries Sturdy constructionLooking for a quick, easy way to True heavy truck and bus tires? You need the HBP 001 Back Plate Adapter! This Back Plate uses along with the Series 80 backing plate and wingnut. Specs: Outside Dia.: 9. 625in Inside Dia.: 2in Application: Heavy Truck, Bus Weight: 7 lbs Qty: Each Use With: S80 BP Backing Plate S80 WN Wing Nut H Plates: HHD001, HHD002, HHD004 Application: Medium Truck Heavy Truck Bus Truer 711 1200R