TRIAL 4.00 R 18 M/C 64M R TLUpdated casing design improves lateral stability in corners compared with earlier Michelin trials tires Trial X Light rear is more than a pound lighter than its predecessor, reducing unsprung weight, for improved suspension response and maneuverability Compatible with low air pressure settings; recommended pressures for trials use: 6 psi front, 5 psi rear Redesigned bead area increases sidewall rigidity to reduce tire movement on rim, even at very low