The DK Swift Junior 20 Inch Bike 2025, a black BMX bike with a straight top tube, front and rear hand brakes, all-terrain tires, and yellow and white graphics on its lightweight aluminum frame, is shown in profile against a white background.

Highlights

  • Junior sized, race proven geometry
  • 155mm forged alloy 3-piece cranks
  • Sealed hubs, chromoly axles
  • Controls sized for smaller hands

Description

Ready to ride. The DK Swift bikes are an affordable first step to a life of BMX. The Swift series is sized to fit every rider in your crew, from the 18” Micro for the youngins to the Pro 20" for full-sized humans. Each Swift bike is built on a lightweight aluminum frame with race-proven geometry, sized by model with proportionate handlebars, cranks, and gearing. The Swift Pro features a sturdy chromoly 3-piece crank, while other sizes have a 3-piece alloy crank, sized accordingly. Alloy rims fitted with all-terrain tires put these bikes into motion and provide a smooth ride on any surface. All told, the Swift Series bikes are easy to ride, ready to race, and delivered at an unbeatable price.

Features
  • Junior sized, race proven geometry. A lightweight 6063 aluminium frame with an integrated head tube, sitting between the Mini and the Expert in the Swift range.
  • 155mm forged alloy 3-piece cranks. Crank length matched to junior legs, turning a 42 tooth chainring into a 16 tooth freewheel for quick starts.
  • Sealed hubs, chromoly axles. Alloy sealed hubs front and rear on 3/8" chromoly axles, with 14 gauge spokes and single wall alloy rims.
  • Controls sized for smaller hands. 5.2" rise bars, a 30mm reach alloy front load stem and DUO Brand Mini grips keep everything within easy reach.
  • Ready to ride at 7.8 kg. An alloy Junior linear V-brake, 20x1-3/8" Arisun XLR8 tyres and a DK Mini one piece seat and post combo.

Specifications
  • Size: 20"
  • Frame: 6063 aluminium with integrated head tube
  • Fork: Hi-tensile steel with 1" chromoly steerer and tapered legs
  • Headset: 1" threadless integrated
  • Stem: Alloy front load, 30mm reach
  • Bars: 5.2" rise, hi-tensile steel
  • Grips: DUO Brand Mini
  • Brakes: Alloy Junior linear V-brake
  • Brake lever: Alloy
  • Cranks: Forged alloy 3-piece, 155mm
  • Bottom bracket: Sealed European
  • Chainring: 42-tooth, alloy, 5-bolt
  • Chain: KMC 1/8"
  • Pedals: Junior PC platform
  • Front hub: Alloy, sealed, 3/8" chromoly axle
  • Rear hub: Alloy, sealed, 3/8" chromoly axle
  • Rear cog: 16-tooth freewheel
  • Spokes: 14 gauge, black
  • Rims: Alloy, single wall, 36-hole
  • Tyres: 20x1-3/8" Arisun XLR8
  • Seat: DK Mini 1-piece seat and post combo
  • Seat post: Integrated, 22.2mm, alloy
  • Seat clamp: Alloy
  • Gearing: 42/16
  • Weight: 7.8 kg
  • Colour: Black

Assembly information

Your bike ships mostly assembled in the box. Finishing it takes most people 10 to 20 minutes with basic tools, and the video above walks through every step.

  • Fit the handlebars and line them up with the front wheel
  • Fit the front wheel, pedals and seat post
  • Check the brakes and tyre pressure before the first ride

Tools: Allen key set and a 15mm, 17mm or 19mm spanner for the pedals and axle nuts (bikes can vary between these three sizes). A socket is needed if installing pegs.

Rather have it done? Ask us about extra assembly before you order, or any local bike shop can finish the build for a small fee.

DK Swift Junior 20 Inch Bike 2025

Brand: DK Bicycles SKU:

$498.00 USD

Or 4 payments of $124.50 USD with

Colour - Black

Top Tube Length - 18.25

BMX race bike sizing

Race frames are sized by class, and the class you ride is set by rider height rather than age.

SizeRider heightTop tube
Micro (18" wheels)Under 120cm16.25"
Mini (20" wheels)110 to 140cm17 to 18"
Junior120 to 150cm18.25 to 18.75"
Expert130 to 170cm19.5 to 19.75"
Expert XL145 to 170cm20 to 20.75"
Pro150 to 175cm20.25 to 20.75"
Pro XL165 to 180cm21 to 21.25"
Pro XXL170 to 185cm and up21.5 to 21.85"
Pro XXXL175cm and up22"
Pro XXXXL180cm and up22.5"
Cruiser (24" wheels)175cm and up21.5" and up

Heights overlap between classes on purpose. Where you land in two, a growing rider is usually better on the larger, and a rider who wants the bike to turn faster on the smaller. Some brands label the Pro size Pro L, with the same fit.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

  • Between two sizes and still growing? Take the larger size.
  • Racing gates and wanting the bike to turn faster? Take the smaller size.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

BMX race bike sizing

Race frames are sized by class, and the class you ride is set by rider height rather than age.

SizeRider heightTop tube
Micro (18" wheels)Under 120cm16.25"
Mini (20" wheels)110 to 140cm17 to 18"
Junior120 to 150cm18.25 to 18.75"
Expert130 to 170cm19.5 to 19.75"
Expert XL145 to 170cm20 to 20.75"
Pro150 to 175cm20.25 to 20.75"
Pro XL165 to 180cm21 to 21.25"
Pro XXL170 to 185cm and up21.5 to 21.85"
Pro XXXL175cm and up22"
Pro XXXXL180cm and up22.5"
Cruiser (24" wheels)175cm and up21.5" and up

Heights overlap between classes on purpose. Where you land in two, a growing rider is usually better on the larger, and a rider who wants the bike to turn faster on the smaller. Some brands label the Pro size Pro L, with the same fit.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

  • Between two sizes and still growing? Take the larger size.
  • Racing gates and wanting the bike to turn faster? Take the smaller size.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

DK Swift Junior 20 Inch Bike 2025 - Black / 18.25

$498.00 USD

Price match request

Metro bike shipping from $59.99

Regional and remote rates may differ

Free in-store pickup - Brisbane

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