The DK Step Up 18 Inch Bike is shown from the side against a plain background, featuring a white frame, black handlebars, seat, and pedals, blue wheel accents, and a lightweight 6061 aluminum construction.

The DK Step Up 18 Inch Bike, shown from the side against a white background, features a black lightweight 6061 aluminum frame, red-rimmed wheels, padded seat, straight handlebars, and visible pedals.

Description

The DK Step Up 18 Inch is the bike for riders who have outgrown a 16 inch but are not ready for a full size 20. It runs an 18 inch top tube on a lightweight 6061 aluminium frame with an integrated head tube and sealed bearings throughout, with chromoly used where it counts.

The parts list is built for real riding rather than for show: Wise tubular chromoly 3-piece 140mm cranks on a 19mm sealed mid bottom bracket, a proper 9T cassette rear hub, a Wise alloy U-brake with a hinged lever, and 2.4 inch Innova Street tyres on 36 hole alloy rims.

Features

Bridges 16 inch to 20 inch. An 18" top tube and short reach parts suit riders moving up from a 16 inch who are not ready for a full size bike yet.
Lightweight 6061 aluminium frame. An integrated head tube and sealed bearings through the frame mean less weight to throw around and less maintenance to keep on top of.
Chromoly where it counts. Wise tubular chromoly 3-piece 140mm cranks and a chromoly fork steerer with a built in bearing race handle the hard landings.
Legit 9T cassette hub. A semi-sealed alloy rear hub with an oversized axle and 9T driver, geared with a DK Replica 25T steel sprocket, the same setup as full size bikes.
Cockpit sized for the rider. 7.5" rise hi-ten bars, a DK Jump top load stem with 53mm reach and DK Tsuka grips with press-in bar plugs.

Specifications

Size: 18"
Frame: 6061 aluminium with integrated head tube
Top tube: 18"
Fork: Chromoly steerer with built in bearing race, tapered hi-ten legs
Headset: Sealed integrated
Stem: DK Jump top load, 53mm reach
Bars: 7.5" rise, hi-ten steel
Grips: DK Tsuka with press-in bar plugs
Brakes: Wise alloy U-brake
Brake lever: Wise hinged alloy
Cranks: Wise tubular chromoly 3-piece, 140mm
Bottom bracket: 19mm sealed mid
Sprocket: DK Replica 25T, steel
Chain: KMC Z-510, silver
Pedals: DK Blender PC platform
Front hub: Alloy, sealed, 3/8" axle
Rear hub: Alloy, semi-sealed, oversized axle, 9T driver
Spokes: 14G, black
Rims: Alloy, single wall, 36-hole
Tyres: 2.4" Innova Street, 60psi
Seat: DK 1-piece padded seat and post combo
Seat post: 25.4mm, alloy
Seat clamp: Alloy

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 Step Up 18 Inch Bike

Name: DK Step Up 18 Inch Bike
Brand: DK Bicycles
SKU: DKRECBA2802
Price: 599.99 AUD
Availability: OutOfStock

Brand: DK Bicycles SKU: Click to copy the SKU and show the pick location

$599.99 AUD

Or 4 payments of $149.99 AUD with

Colour - Black/Red

Top Tube Length - 18

An 18 inch bike suits a rider of about 122 to 147cm, usually 7 to 11 years old, on an 18 to 18.5 inch top tube. It is the last step before a full size 20 inch.

Rider height	Wheel size	Top tube
60 to 91cm	12"	12 to 12.5"
81 to 106cm	14"	14 to 14.5"
96 to 122cm	16"	16 to 16.5"
122 to 147cm	18"	18 to 18.5"
147 to 157cm	20"	19.75 to 20.25"
157 to 168cm	20"	20 to 20.5"
168 to 175cm	20"	20.25 to 20.75"
175 to 183cm	20"	20.5 to 21"
183 to 190cm and up	20"	20.75 to 21.5"
160cm and up	22"	21 to 22.25"
160cm and up	24"	21.75 to 22"
160cm and up	26"	22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If your rider is near 147cm and still growing, look at a 20 inch instead: it is the size they will keep riding.

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 an 18 and a 20? Take the 20. It is the size they will keep riding, and an 18 gets outgrown quickly.
They should be able to stand over the top tube with both feet flat on the ground.

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

Read the full buying guide