The ZTTO SLR Gen3 12-speed cassette is a super-lightweight option (around 285g for 11-50T) that saves roughly 100–150g over a Shimano 105 cassette, but it suffers from inconsistent quality and durability. Some units shift well after careful tuning, especially with electronic derailleurs that allow per-cog adjustment, while others are noisy, difficult to index, and prone to premature wear or catastrophic failure within 1000–3000 km. Many users recommend spending more on a reliable alternative like Shimano 105 or Goldix.
Pros
Cons
- Inconsistent quality: some units never shift well and cannot be properly indexed.1
- Noisy operation, often described as loud clicking or chain noise, especially on the largest alloy cogs.13
- Premature wear and failures: sheared alloy cogs, broken teeth, and loose rivets leading to play.1
- Difficult to set up with mechanical derailleurs; shifting may be finicky and require frequent adjustment.1
- Poor durability: many users report significant degradation or failure within 1000-3000 km.1
- Chain skipping under load, unreliable performance, and lack of compatibility or quality control compared to branded components.2
Key Facts
- Weight: approximately 285g for 11-50T 12-speed; 11-34T 11-speed around 194g.13
- The three largest cogs are made of 7000-series aluminum, while the rest are steel.13
- Construction: aluminum cogs riveted to a steel monoblock.1
- Uses HG freehub standard for most versions; also available in XD freehub.1
- Available in 11-speed and 12-speed versions, with various gear ranges (e.g., 11-32T, 11-34T, 11-36T, 11-50T).1
- Weight difference of ~150g mentioned compared to Shimano 105 cassette.2
Reviews & Ratings
07:18The reviewer discusses issues with a cassette that caused chain skipping during a hill climb race, though they do not explicitly name the ZTTO SLR Gen3 12s Road Bike Cassette. They mention replacing it with a Shimano 105 cassette, which resolved the issues. The reviewer implies the problematic cassette was a cheap AliExpress purchase, contrasting it with the reliability of branded components.
The ZTTO SLR Gen3 cassette is a lightweight 11/12-speed cassette featuring aluminum cogs (typically the largest 3) riveted to a steel monoblock. Users report weights around 285g for an 11-50T 12-speed version and note it is significantly lighter than Shimano 105. However, the cassette suffers from inconsistent quality: some units shift well after fine-tuning, while others are noisy, difficult to index, and prone to premature wear or catastrophic failure (sheared alloy cogs, broken teeth, loose rivets). Durability is a major concern, with several reports of failures within 1000-3000 km. Many users recommend alternatives like Goldix or standard Shimano cassettes for reliability.
AI Summary
Pros
- Very lightweight, saving around 100-150g compared to Shimano 105 cassettes.
- Can shift well with careful tuning, especially with electronic derailleurs that allow per-cog adjustment.
- Good value for money if you get a good unit; some users report near-perfect shifting and no complaints.
Cons
- Inconsistent quality: some units never shift well and cannot be properly indexed.
- Noisy operation, often described as loud clicking or chain noise, especially on the largest alloy cogs.
- Premature wear and failures: sheared alloy cogs, broken teeth, and loose rivets leading to play.
more cons in the review
Key Points
- Available in 11-speed and 12-speed versions, with various gear ranges (e.g., 11-32T, 11-34T, 11-36T, 11-50T).
- The three largest cogs are made of 7000-series aluminum, while the rest are steel.
- Weight: approximately 285g for 11-50T 12-speed; 11-34T 11-speed around 194g (for Gen1 Ultimate, but similar).
more key points in the review
I have both in black, ZTTO (11-32, new Gen3) and Goldix (11-34) for 12sp. Functionaly - shifting on 1x - they are both great. However on ZTTO I have noticed slight discoloring on teeths after like 300kms, really small thing. Goldix is little heavier (246 vs 139), but after 565kms looks still like a new.
Conversely, my 11-34 ztto SLR gen 3 is going on 5,500km now, and still working perfectly. I cycle three waxed (MSW) Shimano xtr/dura-ace (or whatever they're called) chains. Only downside was that the cassette was always a bit noisy, and 1200km ago it got REALLY noisy... ...but, I took it off it bike and applied a single drop of Finish Line wet lube (the one with the green lid) to each of the rivets. Left it somewhere warm to help gravity wick it in. Instantly silenced it. 1200km later and it's still quieter than it was on day one. I'm 76kg, FTP 320, use the full spread on every ride, and love smashing short hard efforts. I'm quite good at not cross-chaining too much (but far from perfect), and pretty good at not shifting under full load, but it's certainly not had an easy life under me. Frankly, I love it, money well spent for the weight saving.
I had the ZTTO SLR3 (gen 3, the one with 3 largest cog being 7000-series aluminum) HG 11-50 12 speed for about half a year or 900 miles. For the first 200 miles I was using the shimano XT M8100 long cage derailleur. It worked but there is always a little noise at some gear, either this or that one. I tried to fine-tune the shift cable tension, limit screw, B-screws. But you will always have a couple of gears that have the noise. Maybe it's just me who are sensitive but it really bothered me. But at the same time I really liked the lightweight-ness of it. (285grams!!!). So I bought the Wheeltop OX 2 mountain electronic derailleur and then fine-tune every cog. It worked beautifully since then (the past 700 miles). extremely quiet at each cog. I am loving it. the cassette cog-spacing must have not been very accurate for some cogs, but the Wheeltop electronic shifting system resolved the issue.
Where to Buy
ZTTO SLR Gen3 12s Road Bike Cassette Super Light Weight 116g 11-28T 11-30 11-32 11-34 11-36 146g K7 12s Spokets HGR universal
Variants
| Configuration | Largest Cog | Weight |
|---|---|---|
| 12s 11-28T | 28 T | 117g |
| 12s 11-30T | 30 T | 120g |
| 12s 11-32T | 32 T | 122g |
| 12s 11-34T | 34 T | 139g |
| 12s 11-36T | 36 T | 141g |
Specifications
Attributes
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