CST C3E25 Scooter Tube - 8.5 x 2" Straight Valve $4,50 favorite_border Moe CST Tubes designed for unique applications and uses. Labeled Size: 8.5 x 2 Color: Black ISO Width (mm): 50 ISO Diameter: 200 / 8" Shaft Type: Smooth Valve: Standard Schrader Tube Compound: Butyl See at Unlimitedbiking See all Tube