I build up bikes for a hobby, and I built up this bike to be a fast, down country type bike, NICA Machine. Size Large. This would be perfect for a 5’ 4 to 6’ 2 rider. It would also just be a great bike For riding the green and blue trails. I have it set up with a 27.5 wheel front and back and a 160 mm front fork for all of the rocks and technical trails around where I live. ** the frame, drivetrain, handlebar, and other parts are brand new. The wheels and tires, and brakes and a couple other parts came off of other bikes, but are in great shape** Here are the specs: 2023 Niner SIR 9 Review - BIKEPACKING.com The Niner SIR 9 features a hand-welded Reynolds 853 steel frame with 160mm travel, designed for use with 29x2.4 or 27.5x3.0 tires. Key frame features include external cable routing, integrated mounts for bottles, bags, racks, and fenders, a PF30 bottom bracket, and 148x12mm Boost rear spacing. The bike utilizes a tapered headtube, a 30.9mm seatpost, and is compatible with singlespeed setups via the Biocentric 30 bottom bracket system. Frame Material & Construction Material: Hand-welded air-hardened Reynolds 853 steel. Warranty: Lifetime frame warranty. Geometry & Ride Characteristics Head Angle: Features a 68-degree head angle, contributing to its trail country geometry. Fork Compatibility: 160 mm travel fork. Ride Quality: The steel frame is known for its comfortable and capable ride, absorbing trail chatter. Mounts & Fittings Bottle Mounts: Two inner triangle bottle mounts, plus one under the downtube and one on the toptube. Bikepacking Focus: Features rack and fender mounts for gear carrying. Technical Specifications Rear Axle: 12x148mm Boost spacing. Bottom Bracket: PF30 (PressFit 30) shell. Front Derailleur: Side swing, front pull compatible. Seatpost Diameter: 30.9mm with dropper post Headset: Compatible with a ZS44/28.6 and ZS56/40 headset. Tire & Wheel Size Maximum Tire Clearance: 29x2.2 or 27.5x3.0. Singlespeed Compatibility System: Compatible with singlespeed setups using the Niner Biocentric 30 bottom bracket. I have it set up with a 27.5 wheel front and back and a 160 mm front fork for all of the rocks and technical trails around here.o