My favourite AliExpress cassette might have a problem…

I’ve recommended these super lightweight bicycle cassettes from AliExpress many times, but it looks like they could have an issue… SIROKO CLOTHING – 10% off (automatically applied via link below): https://srko.co/tracevelo These lightweight SLR Gen3 cassettes from a brand called ZTTO on AliExpress, are pretty incredible for the price. They are MUCH lighter than the equivalent cassettes from Shimano or SRAM, and you can find them for around £60-£70. They use some very intricate and frankly, quite good looking CNC work, and come in a bunch of colours and sizes. The largest 3 gears are machined from a single block of 7075 aluminium, while the rest are made from a single block of steel, however it’s the aluminium gears that could be a problem. A viewer sent me some pictures of his cassette where the top two aluminium sprockets had completely sheared or snapped off the back of the cassette. After taking a more detailed look at the design, it’s quite easy to see how this could have happened. I have run these cassettes on my road bikes for over a year at this point, with no real issues, but it looks like it might be a good idea to proceed with caution when it comes to the 11-36 version of this cassette… AliExpress affiliate links below ↓ FYI, It wont cost you any extra, but I get a little kickback from AliExpress, which helps! Ztto SLR Gen3 cassettes: https://s.click.aliexpress.com/e/_c4V... https://s.click.aliexpress.com/e/_c3O... Ztto SLR Gen2 cassettes: https://s.click.aliexpress.com/e/_c4B... Ztto ULT full steel cassettes: https://s.click.aliexpress.com/e/_c3y... SROAD/SPEDAO cassettes (also a good option): https://s.click.aliexpress.com/e/_c4E... Timestamps: 00:00 – Intro 00:33 – ZTTO SLR Gen3 cassette failure 01:24 – Cassette design 02:34 – Why haven't mine broken? 03:58 – Does use-case matter? 05:05 – Should I be worried? 07:10 – Alternative cassettes 08:21 – Bonus clip Intro roll: Created by Dev Joshi - http://www.go2dev.co.uk Instagram:   / tracevelo   Email: [email protected] Please note: I am not a professionally trained bike mechanic. There can be risks associated with using products that are unbranded, untested, or come from sources where the provenance is unknown. Please talk to a qualified bike mechanic if you are in any doubt. In essence, be careful, do your research, and cycle safe!!!