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The bike should have come with a short length of 14mm hex in the toolkit, mine did.Use it with a 14mm wrench.
What model bike do you have? I’ve seen that pre-early V7 owners got the hex bit in their tool kit, but my V7 II didn’t, and I’d be surprised (and a tad miffed) if any other V7 II, III, or V9 kit came with it.
V9 is a 14mm also.
I have a 2017 V7 III Special
You can use a torx bit on an Allen head if that’s easier to find or you already have a set.I believe a T60 is the size for a 14mm