i have a set of r/a shredder rear tires workde great in my grassy backyard and in the dirt especially the hills i have and grip very well they are 18-9.5-8 and are amazing shape no plugs and hold air great i filled them full of air a year ago and they are still holdin air without me refilling them with air 70+shipping need gone soon they are in exce;;ent shape have about 65% to 70% tread left