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Spacing* (F / R) ie: 110 mm / 130 mm - 111 mm / 135 mm
this is of the correct era
Extension Length - 90 mm
Stock Code - D-BAG-W7C
Model ID - 756
Shimano Dura-Ace (GB-100) 1st Gen c.1972 Vintage English 112 mm Bottom Bracket 121 mm Spacing* (F / R) ie:Original part produced in the 1970s Suitable for historic cycling events such as L'Eroica Professionally checked & cleaned Worldwide shipping Shimano Dura Ace bottom bracket (or BB for short), hailing from Japan and dating back to 1972. Made from steel and weighing in at 266 grams pretty lightweight for a BB at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike. When the Dura Ace 7100 series