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Compatibility: This bicycle bottom bracket and crankset is suitable for most standard bicycles and accommodating chainring sizes from 68x110mm to 68x132mm. However, it is not suitable for 28-inch classic bicycles or children's bicycles. Compared to modern hollow, one-piece spindles, square-hole spindles are less efficient in terms of weight, rigidity, and overall performance. However, they remain an excellent choice for compatibility with older parts and budget constraints. Product Material: This product is specially designed and made of metal, ensuring a long service life and durability. Easy Installation: It can be directly replaced without adjustment, offering perfect compatibility and high reliability. Product include a total of 1Set 3S Bike Bottom Bracket , which can completely meet your daily use needs and replacement.