I just put one of the all-steel monoblock cassettes on my road bike, this one from Goldix (cheaper than the ZTTO version and exactly the same): https://www.aliexpress.us/item/3256806508481172.html
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Small update, I was able to get a quick ride in on this cassette and it shifted excellently. I abused it by shifting in all gear combos under power to see if I could get it to skip or fail and I couldn't. Not
extremely smooth in those circumstances but no worse than the 105 cassette it replaced. Again, given its all-steel construction and my waxed chain, I anticipate that it'll last quite a while.
Also tested on my ride were the Bikingreen 48/31 chainrings:
https://www.ebay.com/itm/114305399000I have the 46/30 version on my gravel bike and I'm happy to report the 48/31 rings work just as well. Flawless front shifting even though the big/small gap is one tooth larger than the official rating for my 105 Di2 front derailleur. I did have to space my crank out by an additional millimeter on the driveside to push the rings out far enough for the front derailleur to be happy though (using a SRAM RED DUB crank [lots of capital letters...], went from 2 mm driveside spacer to 3 mm). Works perfectly with a 12 speed chain, even though the listing only mentions 10/11 speed.
Lastly, I also tested these handlebars from MANA, Elitewheels' component sub-brand:
https://www.aliexpress.us/item/3256805751662318.htmlVery well made with even wall thickness all the way around and a smooth inner finish. Plenty stiff for my rare ~900-1000 watt sprints and comfortably shaped. Slightly lighter than claimed - 400 mm weighed 181 grams - but they're replacing 38 cm wide bars; 40 cm is noticeably wider and, for me, quite a lot less comfortable! I've ordered a set of 36/38 cm (hoods/drops) RXL SL handlebars (
https://www.aliexpress.us/item/3256803645579573.html) and I'll see how they are. I had a rebranded version of this bar on one of my bikes a few years ago and I liked it a lot so hopefully this new one is similar.