Position One Junior

Product Overview

The Position One Junior is a complete BMX race bike designed for young riders entering competitive racing. Built with a 6061-T6 aluminum frame featuring a 19" top tube and geometry derived from Chase BMX's championship-winning designs, it includes race-ready components like a full chromoly fork, sealed bearing hubs, double-wall rims, and integrated headset. Sized for riders 4'0" to 4'5" tall.

Key Features

• Race-proven geometry – Frame design based on Chase BMX championship-winning geometry provides proper handling characteristics for competitive racing from the first ride

• 6061-T6 aluminum frame with integrated head tube – Lightweight alloy construction with integrated headset cups reduces weight and simplifies headset installation

• Full chromoly fork – Steel fork provides durability and compliance for gate starts and jump landings

• Sealed bearing hubs and bottom bracket – Cartridge bearings reduce friction and protect internals from contamination, requiring less frequent maintenance than cup-and-cone bearings

• Double-wall rims – Reinforced rim construction improves impact resistance and allows higher spoke tension for stiffer wheels

• Real BMX race components – Complete with KMC chain, Vee Rubber/Arisun tires, and race-tuned parts from established BMX manufacturers

Technical Specifications

Frame & Fork: • Frame: Junior 19" top tube, 6061-T6 alloy, integrated 1-1/8" head tube
• Fork: Full chromoly, 1" steerer tube
• Geometry: 19" TT, 13" chainstay, 73° head angle, 72° seat angle, 8.75" BB height, 10.6" standover

Drivetrain: • Cranks: 3-piece alloy, 155mm arms
• Bottom bracket: 113mm sealed bearing, square taper
• Chainring: 40T, 5-bolt, 110mm BCD, steel
• Chain: KMC Z33, 1/2" × 3/32"
• Cog: 16T freewheel
• Gear ratio: 40×16

Wheels: • Rims: Double-wall, 24h, 20" × 1-1/8", Presta valve
• Hubs: 24h sealed bearing, 3/8" axle with nuts, freewheel rear
• Spokes: 14-gauge with brass nipples
• Tires: Arisun XLR8 20" × 1-1/8" front and rear

Cockpit: • Handlebar: 4.25" rise, 22.75" wide, 8° back sweep, 2° up sweep
• Stem: Top-load, 40mm, 6061-T6 alloy
• Grips: 130mm soft single-ply, flangeless
• Headset: Integrated reducer sealed bearing (1-1/8" outer, 1" inner for 1" steerer)

Brakes: • Rear brake: Alloy caliper, 95mm
• Brake lever: Alloy Junior/Expert size

Seat & Post: • Saddle: Mini combo seat
• Seat post: Mini combo, 25.4mm
• Seat clamp: Alloy single-bolt

Pedals: • Platform pedals: Polypropylene, 9/16" thread

Weight: • 7.7 kg (16.98 lbs) without pedals

Compatibility and Ideal Use Cases

Designed for Junior class BMX racing for riders 4'0" to 4'5" tall (1.22m to 1.35m). Best suited for young racers entering competitive BMX who need a complete, race-ready bike with proper geometry and quality components at an entry-level price point. The 19" top tube and Junior-specific geometry provide appropriate sizing for this age class. Sealed bearings and double-wall rims reduce maintenance requirements compared to entry-level bikes with unsealed components. Complete bike arrives requiring final assembly by an authorized dealer to maintain warranty coverage.

Note: All bikes must be originally assembled by an authorized dealer for warranty coverage. Frame: 1-year manufacturer warranty for defects. Parts: 6-month manufacturer warranty for defects. Stripped bolts, loose bolts, crash damage, and improper riding are not covered and void warranty.

GEOMETRIES