Dimensions of tire and spoke Tire’s Dimensions The dimensions of tire include the tire width (in inch), inner diameter (in inch), tire layers indicating with dimensions and the three values connecting together by using of “-” symbol. e.g. 13.00 – 24 – 12PR (Narrow Base Tire) Width Inner Diameter Layers 17.5 – 25 – 12PR (Normal Tire) Dimensions of Spokes The dimensions include the spoke diameter indicated in inch and spoke’s type and the spoke width indicated in inch. e.g. 8.50VЧ24 Spoke Width Spoke’s Type Spoke’s Diameter 20-67