The Kink Williams 20 Inch Bike (2026) is a purple BMX with full Chromoly construction, a black seat, handlebars, and pedals, showcased on a white background.

The Kink Williams 20 Inch Bike (2026), featuring a purple frame, black handlebars, and black tires, is set against a gray brick wall backdrop.

The Kink Williams 20 Inch Bike (2026), a signature ride by Nathan Williams, offers sleek purple aesthetics with black handlebars and tires, beautifully set against a dark brick wall.

Description

The Kink Williams is the flagship of the range and the only signature bike Kink builds, made with pro team rider Nathan Williams. It gets as close to Nathan's personal ride as possible at a much friendlier price, stacked with aftermarket parts and full chromoly throughout.

The 2026 model brings the Williams signature forks with an adjustable 20mm or 25mm offset, and a Translucent Purple colourway over polished tubing. Geometry is a 21" top tube, 12.75" chainstays and a 75.5° head angle.

Features

Nathan Williams signature model. Kink's flagship build, made with the Pro team rider and ready to be ridden at a high level.
Adjustable offset Williams forks. New for 2026: chromoly forks with a 20mm or 25mm offset, a 1pc CNC steerer and butted, tapered legs.
Double butted chromoly frame. 100% 4130 chromoly with a double butted top tube and down tube, saving weight without giving up strength.
Four-piece 9.25" chromoly bars. TruTherm heat treated Williams bars with a Brute 48mm stem, Form grips and Thrust bar ends.
Brakes included if you want them. A Mission Cease V2 set with a Token lever comes in the box, so the bike rides brakeless or braked.

Specifications

Size: 20" wheels
Frame: Kink Williams, 100% 4130 chromoly, double butted top tube and down tube
Top tube: 21"
Chainstay: 12.75"
Head tube angle: 75.5°
Seat tube angle: 71°
Standover: 9"
Bottom bracket height: 11.7"
Fork: Kink Williams, 100% 4130 chromoly, 1pc CNC steerer, butted and tapered legs, 20mm/25mm adjustable offset
Headset: Mission sealed integrated
Stem: Kink Brute, 48mm
Bars: Kink Williams, 9.25" rise, four-piece, 100% 4130 chromoly, TruTherm heat treatment
Grips: Kink Form
Bar ends: Kink Thrust
Brakes: Mission Cease V2 with Mission L4 linear cable
Brake lever: Mission Token
Rear hub: Freecoaster
Colour: Translucent Purple, polished tubing
Note: Optional brakes come included.

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.

Kink Williams 20 Inch Bike (2026)

Name: Kink Williams 20 Inch Bike (2026)
Brand: Kink
SKU: KIBIK490PUR26
Price: 1699.99 AUD
Availability: OutOfStock

Brand: Kink SKU: Click to copy the SKU and show the pick location

$1,699.99 AUD

Or 4 payments of $424.99 AUD with

Colour - Translucent Purple

Top Tube Length - 21

A 20 inch bike is the standard adult BMX and suits riders from about 147cm up. At this wheel size the top tube is what changes the fit, so pick that by height.

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 you land in two bands, riding style breaks the tie: longer for flow, trails and transitions, shorter for technical street and park.

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.

Top tube is measured from the centre of the seat tube to the centre of the head tube, so it is not the same as the length of the tube you can see.

A 20 inch bike is the standard adult BMX and most riders end up there, so do not size a tall child down to a smaller wheel.
22, 24 and 26 inch bikes are adult bikes with a bigger wheel, not bigger frames for taller riders.
Size up for stability through trails and transitions. Size down if you want the bike quick and twitchy for spins and grinds.
Top tube is fixed, but stem length, fork offset and bar position all shift how roomy the bike feels once you are on it.

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

Read the full buying guide