Shimano Road Cranks

SHIMANO 105SC CRANKSET

This is one of the best priced, quality road racing cranksets on the market. The 105SC arms appear to be forged using molten aluminum alloy in a casting process. The arms are drilled for the dust caps, fixing bolts, the B/B and pedal spindles. The arms are then broached to make the 2 degree taper for the B/B spindle. The arms are tapped with 22mm x 1mm threads for the arm dust caps, and the needed 9/16" threads for the pedals. Both the right and left arms are painted with a glossy Silver-Grey enamel finish, (discerning defects or fatigue because of the paint is made more difficult, but the expense of polishing is avoided). The current version of the 105SC cranks bear the Shimano part number of FC 1056 (Front Chainwheel 1056) which comes with a set of the Shimano "capless design" crank bolts. These bolts, made of Chrome plated steel, have an 8mm hex fitting built into the bolt/washer which allows removal and tightening of the bolt with a long handled (for leverage) hex wrench (you will still need a crank arm pulling tool to remove the aluminum arm without damage). Around the exposed crown of each 13 gram crank bolt is a snap-on plastic Grey plastic dust seal.

The 105SC cranks come with two aluminum chainrings that are die stamped to shape and turned to reduce the 2.83mm thickness to 1.97mm on the front side of the teeth. After milling the tops of the teeth are struck or stamped to make the necessary points. These are SuperGlide round chainrings, to be used with any chain, including Shimano's HyperGlide. The outer chainring is the SG-X type with paired tiny steel rivets within crimped areas of the chainring to assist in lifting the chain onto the large chainring occurring in three positions. It also has an anti-jam pin. The chainrings are then Silver (clear) anodized. Nickel plated steel fixing bolts with 5mm hex heads are used to fasten the cranks and chainrings to the 130mm bolt center diameter patterned arm. The 105SC cranks will work with any 2 degree, tapered spindle, bottom bracket. Shimano recommends a 107mm length spindle for either a 68mm or 70mm B/B shell. This arm set had a Bike-Pro Q measurement of 153mm. We stock Shimano 105SC cranks in 170mm, 172.5mm, or 175mm lengths, with the 42-52 or 42-53 tooth chainrings. We can special order them in the shorter 165mm or 167.5mm lengths but it may take quite some time for delivery. 105SC cranks come as right arm, left arm, two chainrings, all the required fixing bolts, and a set of "cap-less" crank arm caps. The 172.5mm 42-53t crankset, with all included parts, weighs 695.5 grams. Specify length and chainring sizes. $ Price in Catalog Copyrighted material - All rights reserved

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