O.L.D. spacing is 135 mm. Dropouts were designed with a Rohloff OEM Speedhub in mind. Fit a Shimano Alfine/Nexus like you would on a regular bike. In fact, go with any standard O.L.D. hub. For cassette setups, any number of sprockets is permissable as long as the lowest sprocket is 36T or less and the highest sprocket is 12T or less. If a Shimano Internal hub is installed along with our chain tensioner, 7L/R black/grey anti-rotation washers must be used.
The Vostok triangle has IS disk mounts and a Brompton caliper brake mount. The disk brake rotor's diameter should be 160 mm. Install either a mechanical or a hydraulic brake. Use an appropriate Post Mount adaptor if needed.
Standard rollers and Eazy wheels will fit the triangle and so will a standard suspension block, mudguard and rear rack. The Brompton pump, unfortunately, cannot be fitted due to the specific geometry of the chainstays.