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
Brand: Gipiemme
Model: Sprint Strada 68
Origin: Italy
Standard: ISO
Length: 113.5 mm
Distance between the two bearing seats: 51 mm
For French standard and BSC bottom brackets: 58 mm
Material: steel
Year: circa 1980
Condition: new item, old stock, in perfect condition.
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