This thread popped up on the NYC boards this weekend. Catnap was always stoked on the Clipless Gyrizo Nike Dunks. Unfortunately, the price-point was too high for him. To compensate for this, he recently took it upon himself to convert his old Slam City Skates Nike SBs into an SPD-equipped sneaker. How did he do this exactly? Well, you’ll have to head over to his site to read his DIY tutorial.