?ar-pro ar-pro 22x11-8, 21x11-8 inner tubes for atv, lawn tractor, garden trailer, golf cart, snow blowers, and more - with tr6 straight metal valve stems - made from durable butyl rubber (2-pack) 21x11-8,tr-6 is up for auction in Patio, Lawn & Garden. The current bid is $1.00, 97% below the $39.00 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.