Inner Tube 12x2.125 - TR87 90 Degree Valve Stem - 12/12-1/2x2-1/4 (12/12.5x2.125) 12/12-1/2x2-1/4 (12/12.5x2.125) Inner Tube with Angled Valve Stem Will fit on 12x2.125 tire size usually found on folding bikes, electric bikes, unicycles, small trailers, 12 kids bikes and strollers Fits on Rim Size: 2.50 (12) 16H 12x2.125 tire size Heavy duty durable valve stem. Unbeatable performance and value.