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russmeyer
I've heard that the Sunrace derailleurs are made of cheese. If it ever fails on you zee will happily take up to 46 cog with this:
https://www.ebay.co.uk/itm/UK-Bike-Rear-Derailleur-Hanger-Extender-Road-Bicycle-Frame-Gear-Tail-Extender/163656525852?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20180105095858%26meid%3Dae625528c4bf4222bb25f4936d024b9c%26pid%3D100904%26rk%3D1%26rkt%3D20%26sd%3D163656525852%26itm%3D163656525852%26pg%3D2509164&_trksid=p2509164.c100904.m5276
Also the M6000 and M7000 10 speed groupsets are backwords compatible with the older 10 speed stuff.