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I'd be using a cross fork, likely a wound up, would 15mm be a significant difference?
The V3 I saw was at a bike store and apparently ordered by the owner before they even started selling them publicly. There was also a medium in the window and the difference was slight, but noticeable. My phone is broken but I'll take a picture tomorrow, I might even ask them if I can measure it.
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15mm can make a significant difference to the handling, not to mention the rake on the CX fork are bigger than the BMW.
This will result in the BMW feelings a lots more nimble to steer, moreso than road bike even due to even steeper seat angle and large rake.
Might work with a Kinesis fork as they're 405mm long.
BTW double check with BMW; the fork on the V3 is 405mm, same as the V1.
Using what fork? Standard CX fork at 395mm, road are 375mm.
The frame builder may have to tweak the geometry significantly to be used with normal fork.
Email BMW as they have gotten quite good at replying emails.
V3 Large is out already?