The Grand Mighty is the only choice for track professionals. This is the crankset the Keirin racers' ride and trust. Ultra stiff Sugino Super Duralumin Alloy, Champagne anodizing and a bit more finish machining makes this a superb track crankset. NJS Naturally.<br /><br /> Sugino recommends using a Sugino75 or 75 Superlap BB<br /><br /> Spindle Interface Type: Square Taper ISO<br /> Spindle Length: 109 mm<br /> Chainring BCD: 144 mm<br /> Bolt Pattern: 5-Bolt<br /> Crank/FD Type: Single Ring<br /> Chain Compatibility: 1/2" x 1/8"<br /> Pedal Spindle Thread: 9/16"<br /> Color: Champagne<br /> Made in Japan<br />Includes Sugino Chainring Bolt Set<br />