While adhering to the same performance design principles as the original Oysi Inline Skating Chassis, we’ve packaged a similar skating experience into a more compact form to complement smaller boot sizes.

The Oysi Medium Chassis⁶⁵ is designed to ride flat using a combination of 65mm outer and 58mm inner wheels and 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, the Oysi Medium Chassis⁶⁵ is designed to hug your soul.

Designed and Manufactured in the USA. (Sold in Pairs.)

Familiarize yourself with the chassis by reviewing the .

Please review our  and utilize our  to help with determining your wheel selection.

( Max Outer Wheel Diameter: 68mm | Max Inner Wheel Diameter: 60.00mm )

Fitment of 63mm through 68mm wheels on the outer axles to create a clear recess above the chassis mounting plane. 

For sizing information please see our 

Please note that the inner sidewall spacers usually require a press fit. Demonstration of how to do this using common tools is provided here – 

What is the difference between the Oysi Frame and the Oysi Medium Frame?

The Oysi Frame has a maximum wheel size of 72mm on the outside and 60mm on the inside (though other variations are available). There is only one wheelbase size, with an inbuilt rocker for enhanced manoeuvrability. The H-Block is wide and features wheel cupping.

The Oysi Medium Frame follows the same principles as the Oysi Frame, though it’s designed for smaller skate sizes. The frame comes in two wheelbase lengths, 257mm and 269mm. This is the measurement between the front and back axles. The size of the physical structure is the same on both sizes. Flat configuration is 65mm on the outside wheels and 58mm on the inside wheels, though other variations are possible and create different rockering opportunities.