Those weigh a ton
Zayante: 712g (172.5mm with 50/34 rings) Ultegra 6800 supposedly 765g for 53/39 with BB, which would be 77g, so 688g.
Zayante reportedly a whole load stiffer than Ultegra.
6800 RRP £250, currently £160 on CRC. Zayante seems to be £200 everywhere. I got mine barely used from eBay for £77 posted.
@Emyr started
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Those weigh a ton