2 Pack Martin Wheel T858 18x850-8 Inner Tube TR13 Straight Valve 18x950-8 by Martin Wheel $32.99 Sold out 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out PRODUCT INFORMATION Type Inner Tube PRODUCT DESCRIPTION Brand New (2) Pack of Martin Wheel Company Inner Tubes…· Inner Tube (2) Pack· Martin Wheel Company Part # T858· Fits Tire Size 18x850-8· Also Fits Tire Sizes: 18x950-8 & 20X1000-8· Valve Stem: TR13 Straight Valve Stem