The steel frame OKA from the brand PRODUCTION PRIVEE is the "little brother" of the well known SHAN 27 from the same brand. Delivered in 650B, you can easily switch to 26" with the optional kit available from Production Privee. The frame is 150 grams less that his big brother. The tubes are from a smaller diameter, the type of steel used is CROMO 4130 Japan Double Butted developed for the brand.
The head-tube is tapered and ready for a fork from 120mm to 140mm travel. The Top Tube is longer of 10mm. The OKA is definitely more oriented for a TRAIL / All Mountain use, it is more versatile and it is more designed to pedal for a longer time than the SHAN 27.
But not to break the relationship, the OKA inherits many elements from the SHAN 27. The frame has anti-corrosion treatment both internally and externally by ED Black process (anti-corrosion treatment as electrophoresis). The CROMO 1430 Japan is Double Butted (when for the SHAN 27 it is Triple Butted) receive a heat treatment to increase the rigidity of the frame except seat-stays that needs to stay soft flexible to absorb vibration. KTP flex system - which consist in flattening the the tubes (stays, base) that compose the rear triangle to give it a vertical flexibility without loosing lateral stiffness. The bottom bracket is Press-fit because it allow to enlarge the base in order to set up larger tires.
Delivered in 142.12mm rear axle (recommended), PRODUCTION PRIVEE sell as spare parts 135x10 rear hanger. Same for the wheels size, the frame is initially ready for 650B but you can afford spare parts to suit the frame for 26" wheels.
Use: Trail / AM
Wheel size: 650B, can be built with 26" wheels with a specific conversion kit
Fork : from 120 to 140mm travel
Material: Cromo DB 4130 Japan seamless
Heat Treatment : All the tubes except seatstays
Headtube: Tapered, integrated campagnolo 45x45, SHIS: IS42/IS52
BottomBracket : BB92 Press Fit standard (68/73mm crankset compatible)
Rear hangers: removable design and provided with 12x142mm
ISCG :ISCG 05
Seat post diameter needed: 30.9mm
Seat clamp diameter: 32.8mm OKA specific
Front derailleur compatibility: direct mount ONLY, top pull.
Weight : 2490g in medium size
Finish: ED treatment before painting
Artwork: Two tones painting