Reviews & Ratings
Trace Velo on YouTubeabout 1 month ago
00:09:52@ 07:10
The reviewer analyzes a failure of the ZTTO ULT2 cassette, specifically the 11-36T version, focusing on a design weakness in the top two aluminum sprockets. They explain the structural and use-case factors that likely led to the failure and compare the design across different cassette sizes.
AI Summary
Pros
- Lightweight (ultralight, prioritizes minimal mass)
- Visually appealing with nice colors
- Good value (built to a price point)
- Shifting performance is 'really decent' (90-95% of major brands)
Cons
- Potential structural failure point in the top two sprockets of larger sizes (30T, 32T, 34T, 36T)
- Design creates a cantilever beam effect and stress risers
- Less safety margin due to aggressive material removal
- Noisier than official Shimano cassettes
- Aluminum teeth can snap if shifting under load
- Prioritizes weight saving over durability and safety factor
Key Points
- The 11-28T version has a different, stronger web structure where only the largest sprocket uses thin support arms.
- Larger versions (11-30T, 32T, 34T, 36T) have a 'double stack layout' for the top two sprockets connected by a thin ring of supports, increasing failure risk.
- Larger sprockets are more flexible and act as longer lever arms, increasing stress.
- Use case matters: spiky power delivery (e.g., cyclocross racing) puts massive stress on the cassette.
- The cassettes are CNC-milled from aluminum, pushing the material's limits.
- The reviewer suggests steering clear of the 11-36T and 11-34T versions.
Purchase
Where to Buy
aliexpress.com#1005009683398235Affiliate · Trace Velo
aliexpress.comSupport MyBikePartsAffiliate · MyBikeParts
🇫🇷€93.99
🇬🇧£77.35
Checked about 1 month ago
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