Never compare tire profiles of unmounted tire photos, only mounted tires!

Here's the Pirelli Diablo 150/70 ZR 18 mounted on the 18" BST front rim (left, and new) compared to the stock Metzler ME880 150/80 17 front tire on stock rim (right, and worn):



To reiterate, IMHO, this "rear" Pirelli is the perfect R3 front tire when used with the BST CF front wheel.

Anyone considering mounting a tire on the BST R3 front rim that is 1" smaller in diameter needs to read this:

DANGER!! Possible Tank Slapper!