The first bottom brackets, dating back to the early 20th century, used cotter pins. In the 1960s and 1970s, square JIS and ISO standards became the norm, offering robustness and ease of maintenance. The 1990s saw the arrival of sealed cartridge bearings, which are more durable and maintenance-free.
Square bottom bracket axle
lenght : 121 mm
Brand: Stronglight
Origin: France
Weight: 176g
For standard French bottom bracket shell, 68 mmaxle length: 123 mm
material: steel
condition: used item, good condition
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