12 1/2 x 2 1/4 (62-203) Grey Block Tread Wheelchair/Powerchair Tyre. This is a high quality heavy duty tyre made by Cheng Shin. It can be inflated to 40 psi (2.8 bar). 12'' Grey Block Tread Tyre for wheelchairs and powerchairs that require the size 12 1/2 x 2 1/4 (62-203) High quality heavy duty grey pneumatic tyre Cheng Shin Brand Can be inflated to 40 psi (2.8 bar) Requires Innertubes (not included)