ZTTO Ultraight 11 12 Speed Road Bike Cassette 11s 12s 11-28/30/32/34/36T ULT Sprocket 11s 34T Gold Flywheel 11V 12V Gravel K7 HG

Reviews & Ratings

Trace Velo on YouTube 2 days ago

My favourite AliExpress cassette might have a problem…

The reviewer analyzes the ZTTO Ultraight cassette, focusing on a structural failure in the 11-36T version. They explain the design flaw, compare it to the more robust 11-28T version they use, and discuss how use case and sprocket size affect failure risk. They conclude these cassettes prioritize weight over durability.

AI-Summary

Pros

Lightweight (prioritizes minimal mass)
Visually appealing with colors
Good value (built to a price point)
Shifting performance is decent (90-95% of major brands)

Cons

Potential structural failure in larger sizes (11-34T, 11-36T) due to design
Sharp internal edges and 90° corners act as stress risers
Thin support arms create a cantilever beam effect on top sprockets
Larger sprockets are more flexible, increasing failure risk
Noisier than official Shimano/SRAM cassettes
Aluminium teeth can snap if shifting under load
Questionable safety margin due to extreme material removal

Key Points

Failure observed on an 11-36T version used in cyclocross.
Design differs by size: only the 11-28T version has a safer design where only the largest sprocket uses thin support arms.
Larger sprockets act as longer lever arms, increasing peel-off forces.
Use case matters: spiky power delivery on rough terrain stresses the cassette more.
Cassettes are CNC-machined from aluminium, pushing material limits.
Recommends steering clear of the 11-36T and 11-34T versions.