27.5er anyone?

Finally got my conti race king to fly up and seal. I expected it to be big but not that much.
And it's not the width but the diameter that's the problem.
It spins freely and i would love to try it but there's just not enough clearance in my frame.
So, out with the measuring tape and it is actually a full 3cm taller than a Racing Ralph or a Rocket Ron. (at 40psi). 69.5 cm total which makes it almost 27.5 inches.
Anyone still tossing up between a 26er and a 29er, here's your chance. Will pass it on for 50....
This is the 2.2 supersonic....
Cheers