ZTTO Ultralight 11/12 Speed Road Bike Cassette 11s 12s 11-28/30/32/34/36T ULT Sprocket Freewheel 112g~146g 11V 12V Gravel K7 HG

The ZTTO Ultralight cassette offers significant weight savings but raises durability concerns, especially under high power, though the latest generation is reportedly improved.

Pros

Massive weight saving (around 127g).
Newer generation (SLR Gen 3) reportedly improved over previous versions.
Slightly increased weight may improve durability.
Some users report solid performance (e.g., Goldix variant).

Cons

Previous generation failed 'pretty disastrously'.
Durability skepticism under high power (e.g., 450+ watt climbs).
Not yet recommended by some reviewers pending long-term testing.
Large aluminum sprockets may be less durable under stress.

Key Facts

Weight 127.1g for the reviewed sample (SLR Gen 3).
15g heavier than the first-generation model.
Compatible with 11/12 speed Shimano HG freehub.

Reviews & Ratings

Tom Bowers Cycling on YouTube5 months ago

00:15:22@ 09:10

I Made My 5.5kg BMC Even Lighter - Diminishing Returns Hit Hard

The reviewer discusses their experience with the ZTTO Ultralight SLR Gen 3 cassette, which they have purchased as a replacement for a previous ZTTO cassette that failed. They note it is a newer, supposedly improved generation.

AI Summary

Pros

Offers a massive weight saving (around 127g).
ZTTO has reportedly gone back to the drawing board to improve it.
The weight has been increased slightly from the first generation, which is theorized to improve durability.

Cons

The reviewer's previous first-generation ZTTO cassette failed 'pretty disastrously'.
They are skeptical about its durability, especially under high power (e.g., 450+ watt hill climbs).
They explicitly state they are not ready to endorse or recommend it yet.
They position themselves as a 'guinea pig' to test its longevity.

Key Points

This is the new 'SLR Gen 3' version.
The reviewed sample weighs 127.1 grams.
It is about 15 grams heavier than the failed first-generation model.
The reviewer hopes using a smaller 34-tooth chainring will put less stress on the large aluminum sprockets, potentially extending its life.

kubackje of Chinertown in Component Deals & Selection 2 months ago

Purchased: 2026-03-31