3.50/4.00-10 Classic Euro-scooter size Slightly offset straight Schrader valve with retainer nuts The Kenda 3.50/4.00-10 inner tube with a straight Schader valve stem fits tires with a 10″ rim diameter A feature of this tube is the offset stem Description The Kenda 3.50/4.00-10 inner tube with a straight Schader valve stem fits tires with a 10″ rim diameter. A feature of this tube is the offset stem. Unlike an angled valve stem, this model features ae valve stem that is slightly off-center by design. The 3.50-10 is a classic tube and tire size for the many “Euro-scooters” from the 1960s through the ’90s, such as Vespas and Lambrettas. It will also be found on some currently made “retro-style” scooters. This high-quality tube sports a 1-1/8″ straight valve with a pair of locking nuts to retain the stem at just the right height on your wheel hub. WARNING California Residents : Proposition 65 Warning Specifications Size: 3.50/4.00-10 Valve stem: 1-1/8″ straight Schrader