Birzman Spoke Ruler

. The Birzman Spoke Ruler is a traditional 12" steel ruler at heart but features precise measuring guides for spokes and ball bearings. The spoke guide allows you to insert the spoke and slide up until it stops, where it will provide the spoke size. Similar for ball bearings, the circle guides are sized to the most common bike bearing sizes and you simply place the ruler on top to determine the bearing size you are measuring. For complete accuracy and durability all the guides and measurements are embossed into the stainless steel surface Features Material Stainless Steel Ball Bearing Guide 18, 532, 316, 732, 14 Spoke Diameters 1.6 4 4Buy Birzman Workshop from Chain Reaction Cycles, the World's Largest Online Bike Store.