ZTTO SLR Gen3 11speed Road Bike Cassette 11 Speed 11-30 11-32 11-34 11-36 11-28T 112g K7 11s Spokets HGR universal

The reviewer analyzes the ZTTO SLR Gen3 11-speed cassette, focusing on a specific failure where the top two sprockets sheared off. They note the cassette is lightweight, visually appealing, and affordable. The design involves the top three sprockets milled from a single aluminum block with the rest being steel. The reviewer has used smaller versions (11-28T) for years without issue, but identifies a design flaw in larger sizes (11-30T and up) where the top two sprockets are connected by a thin ring of supports, creating a potential cantilever beam effect and stress risers. They attribute the specific failure to use on a rough cyclocross course with spiky power delivery. The reviewer concludes that these cassettes prioritize weight savings over durability and safety margin, advising caution with larger sizes.

The reviewer discusses their experience with a cheap AliExpress cassette (likely the ZTTO SLR Gen3 based on context) that failed during a hill climb race. They mention the cassette started skipping under power, particularly when standing on steep gradients, which ruined their race performance. After replacing it with a Shimano 105 cassette, all issues resolved immediately. The reviewer reflects that while the lightweight AliExpress cassette (approximately 112g) offered weight savings, its unreliability outweighed any benefits. They acknowledge that sometimes budget components work, but this was a clear failure case.