Man brother, Ducati should hire you as their stylist ! I was thinking of swapping out my 3 spoke wheels on my 2001 ST4 ( I don't know if they will fit or not) with GT1000 spoked wheels, but I really like the Marchesini's you put on your GT!
Thank you for the kind words!
I would NOT recommend you putting GT1000 OEM spoked wheels on your ST4.
The rims are made of steel and the extra weight in the outer part of the wheels can significantly reduce the bike's performance:
1) You need more power to build enough rotational kinetic energy to put those wheels in motion, so the throttle response will be slower.
2) Brakes will not be as responsive because a considerable amount of brake power will be used to reduce the rotational kinetic energy on those heavy wheels spinning.
3) Direction changes will also be harder to make due to the gyroscopic effect that increases with the amount of mass spinning.
4) Both front and rear suspensions will get a harder time keeping the tires in contact with the ground because every street bump will put all the additional mass in motion.
GT1000's OEM spoked wheels are beautiful, but I'd only recommend them if you are fond of low speed riding.
Having said that. If you still want to go that route, be aware that the front 4 piston calipers on the ST4 would be too big for the GT1000 front spoked wheel. You would need to replace them with 2 piston calipers like the ones you find on 620cc Multistradas (another performance downgrade).