Oysi - Medium Chassis While adhering to the same performance design principles as the original Oysi Inline Skating Chassis, Oysi have packaged a similar skating experience into a more compact form to complement smaller boot sizes. Oysi Medium Chassis is designed to ride flat using a combination of 65mm outer and 58mm inner wheels. The Medium Chassis is available in either 257mm or 269mm wheelbase lengths, both providing the same thoughtfully contoured groove centered between a 127mm middle wheel split. Effective use of the space beneath your feet yields an uncompromised groove, responsive control, and low profile. Featuring a 5.7mm lower ride height and 4.2mm reduction in groove height. Designed and Manufactured in the USA. (Sold in Pairs.) ( Max Outer Wheel Diameter: 68mm | Max Inner Wheel Diameter: 60.00mm ) Fitment of 63mm through 68mm wheels on the outer axles Requires Modification of the Soul Plate to create a clear recess above the chassis mounting plane. • Oysi Medium Chassis65 (pair) - Made in the USA • 8x Standard 8mm Axles • 16x Metal Sidewall spacers • 4x ISO Class 10.9 UFS Fastener (12mm length) • 4x ISO Class 10.9 UFS Fastener (16mm length) • 16x Nylon Washers for Coping Mode • Wheels are not included • Bearings are not included please note that these frames do not come with retail boxes. They will be well wrapped in packaging material for postage.