Shimano Road Cranks

SHIMANO ULTEGRA 6400 CRANKSET

The Shimano 6400 Ultegra crankset is made of aluminum alloy and appears to be a forged of molten aluminum. After the forging the arms, any roughness or "flash" is milled away. The back side of the spider of the right arm is milled to remove excess aluminum and produce a clean, uniform look. The arms are drilled for the B/B spindle, the crank arm dust cap, pedal spindle, and also, on the right arm, fixing bolts, (130mm spacing). The hole for the B/B spindle is broached to make the 2¡ tapered sides, then the dust cap and pedal spindle holes are tapped with threads. Each of the arms is then polished on the front, top, and bottom, (the rear is left largely un-polished), Clear (Silver) anodized, then screened with the Shimano logo. The Ultegra crankset has round Superglide chainrings with cut down teeth at the top and bottom of the pedal stroke to improve shifting. Shimano, in an effort to reduce the "Q" factor has made the Ultegra crank with a low profile spider. The inner chainring rests farther over the bottom bracket shell, using a shorter, and therefore stiffer B/B spindle giving the crankset less flex in the B/B. Ultegra cranks come with two aluminum alloy chainrings that are die-cut to shape then turned on a lathe to taper its thickness from 3.61mm to 2.02mm.

The die-cut teeth are stamped to create the point, tapering the front face of the teeth. The two teeth most responsible at the top and bottom of the pedal stroke for the SG shift are left shorter and milled to shape. Both chainrings are Silver (clear) anodized. The outer chainring has an anti-jam pin driven into it to assist, in case of overshift. Nickel plated steel fixing bolts with 5mm hex fittings are used to fasten the cranks and chainrings. The crankset comes with two chrome plated plastic crank arm caps that have black rubber O-rings to seal out dirt. Though the holes for the dust caps are tapped with 22mm x 1mm pitched threads, the provided dust caps are a press-in type. All after market aluminum replacements are compatible. The cranks will work with any 2 degree, tapered spindle, bottom bracket. Shimano recommends a 113mm B/B spindle length for a 68mm English B/B shell and a 115mm for a 70mm Italian B/B shell. We stock Shimano Ultegra cranks in 170mm, 172.5mm, or 175mm lengths with the 42-52 or 42-53 tooth chainrings. We can special order them in 165mm or 167.5mm lengths but it might take quite some time for delivery. The Ultegra 6400 cranks come as right arm, left arm, two chainrings, all the required fixing bolts, and a set of crank arm caps. The 175mm 42-53t crankset, with all included parts, weighs 685 grams. The 172.5mm 42-53t crankset, with all included parts, weighs 676.5 grams. Specify length and chainring sizes. $ Price in Catalog

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