Spoke wheel with racing profile, PU tyres, plastic rim, wheel xW 310 x 55 mm, 4+ items. Supplied = assembled. Wheel diameter = 310 mm. Wheel size = 12.1/2x2.1/4 inch. Max. load at 4 km/h = 60 kg. Wheel width = 55 mm. Wheel bearing = ball bearing. Wheel material = polyurethane. Material of rim = plastic. Number of spokes = 5 pcs. Tyre profile = racing profile. Hub bore = 12 mm. Hub length = 54 mm. Shore hardness = 75° Shore A +/-5° Shore A. Temperature resistance = +10 °C to +30 °C. Rim colour = black. Running surface colour = black. Installation length = 54 mm. Product type = spoke wheels. Feature = puncture proof, ball bearing flush.