This offering is for a set of new-old-stock Shimano 105 SC crankarms (Model FC-1055) for a double chainring set. The crankarms are made from a forged alloy (for added strength and durability), so they should hold up well under most conditions. The date code stamped on the backside of each crankarm indicates an early 90's model, which makes this a fairly unique item in new-old-stock condition. Shimano's 105 drivetrain during this era was index (or as Shimano used to call it, "SIS") shifting capable and was marketed primarily as a 7-speed groupset (although this crankarm set should perform well with other drivetrains, as long as the specs. noted below are adhered to).

The crankarm set measures 170 mm in length, weighs 560 grams (per our digital postal scale) and has a bolt-circle diameter ("BCD") of 130 mm. Other specifications indicate the crankarm set is designed to accept a JIS spec'd square-tapered bottom bracket. Additionally, if matched with an English threaded frame, then this crankarm set requires a bottom bracket with a 68 mm shell and a 113 mm spindle. Although, if matched with the less common Italian threaded frame, then a 70 mm shell and a 115 mm spindle will be needed to ensure optimal chainline for functional index shifting. Catalog research further indicates if a newer cartridge bottom bracket is matched with these crankarms, then a 115 mm spindle length is recommended (regardless of the bottom bracket shell specs.).

As for condition, this is a new and unused crankarm set, but there is some shopwear (so expect visible scuffs and scratches). Please also note this offering includes a set of factory matched black crankbolts and gray dust covers. Listing Update...We have begun updating the pictures in this listing to reflect the next crankarm set available.  As a result, the crankarm set pictured in this listing is the next one that will sell/ship. Although, please keep in mind the scuffs/scratches do not always show up as well in the pictures relative to what we see in person (and just want to be as honest as I can to those that may be considering this offering). So please do review the pictures closely, as you should be able to identify most of the shopwear-type marks when viewed on a large computer screen.