Chimera Unlimited rear drum hub will allow you to attach most bolt pattern rims on the market! To make things simple the bolt pattern holes are drilled to M12 and tapped to 1.5mm thread pitch, allowing the end use to install thread in studs or lug bolts. To ensure proper lateral distribution and centering of the rear rim, a 68mm diameter centric hub was added to the center of the hub. Machined from T-6061 aluminum with a steel brake lining pressed in. Ideal for 5", 6", 7", 8", and 10" wide rear rim! Bolt patterns: - 4x4 (4x101.6) ~ M12x1.5mm - 4x100mm ~ M12x1.5mm - 4x110mm ~ M12x1.5mm - 4x115mm ~ M12x1.5mm Chimera Unlimited Drum Hub for Yamaha C3 Zuma 50cc 4T is designed by the originator of the Universal GY6 Drum Hub.