This offering is for a new-old-stock Shimano 105SC crankset (Model FC-1055) that is in it's original retail box. Date coding indicates an early 90's model and Shimano's 105 drivetrain during this era was index (or as Shimano used to call it, "SIS") shifting capable. We also believe it was during this period (1990 to be exact) that Shimano redesigned the 105 drivetrain to incorporate their Hyperglide technology.

The crankset would have been marketed as compatible with Shimano's 7-speed drivetrain components of this era, but it should function with a number of other drivetrains. The key in this regard is to make sure the crankset is matched with the correct bottom bracket to ensure proper chainline (and Shimano specs. proper chainline on a double crankset to be 43.5 mm). To achieve this desired chainline, our Shimano catalogs indicate a 68 mm x 113 mm square tapered (JIS standard) bottom bracket is recommended for an English threaded frame (and a 70 mm x 115 mm for an Italian threaded frame). Catalog research further indicates if a newer cartridge bottom bracket is matched with this crankset, then a 115 mm spindle length is recommended (regardless of the bottom bracket shell specs.).

This particular model also has the round SuperGlide (SG) chainrings with a 52T large (outer) ring and a 42T small (inner) ring. The crank arms are made from a forged aluminum alloy (so should be very strong) and measure 170 mm in length. We should also note the right crankarm has a bolt-circle diameter ("BCD") that is the relatively common size of 130 mm (so should be compatible with most Shimano chainrings designed for a double crankset...when it comes time to replace the rings at a later date). Please also note the crank bolts were not included with these cranksets, but the dust caps were...just as pictured (although, if a customer needs a set of crank bolts, then let me know following a purchase and I will try to locate a pair to include with the order).