Incorporates ramped knobs for low rolling resistance and channel-cut knobs to increase gripping edges, giving straight-line control and precise cornering 3C Maxx Terra is softer and offers more traction than 3C Maxx Speed, yet provides better treadwear and less rolling resistance than Maxx Grip EXO equipped models feature Maxxis` EXO sidewall protection which help prevent puncture from sidewall abrasions DD - Double Down construction features two full 120 TPI casing layers reinforced with a butyl insert TR - Tubeless Ready - sealant required Tubeless 29x2.3 622 TBLS - Fold Bk/Blk 60 1145 2x120 TERRA/EXO/DD NoUPC/EAN/GTIN: 4717784031989