https://corearoadbike.com/board/board.php?t_id=Menu01Top1&no=1971195
It's a Dura-Ace sprocket.
Many people gave their opinions, but the problem with the 17-19t cog was correct.
If you watch the GIF, it shakes from side to side.
I checked the genuine product and the price of the 17-19t was 213,000 won? ㅋㅋㅋㅋ
So I looked for a 17-19t cog on AliExpress, but there's no Dura-Ace, and even Ultegra cog is out of stock.
I remembered that Ultegra was attached to Smartron, so I detached it and transplanted it.
By the way, I measured the weight, and as expected, there's a considerable weight difference between Ultegra and Dura-Ace.
Please refer to those who have similar symptoms~
