KENDA 200x50 4PR (K909) Wheelchair & Scotter Tire, Grey 4 Ply Casing. Kenda 200x50 4PR (K909) Wheelchair & Scotter Tire, Grey 4 Ply Casing. Heavy Duty 4 Ply, durable casing with grooves to channel water ! Made for Wheelchairs & Scotters. Grey Non-Marking Tread ! Heavy Duty 4 Ply Casing !