I have a 2019 Kawasaki zx6r 636 with a 12-13mm steerer tube hole. The universal RAM mount fits, but doesn't tighten enough to prevent your devices from rotating, meaning the ball rotates very easily, as does anything attached to it. The best product that installs in seconds, stays ultra secure and prevents your devices from rotating is the Buybits 12mm Motorcycle Stem Mount. Shown is a Buybits 12mm mount, not a RAM stem mount. link below. The BuyBits 12mm stem mount is more expensive, but it was worth it for me.
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