The Sunday Primer 18 Inch Bike (2025) in red, viewed from the side against a white background, features black handlebars, seat, and tires along with pro-style frame geometry and Odyssey Springfield brakes for enhanced control.
The Sunday Primer 18 Inch Bike (2025), shown from the side on a white background, features a yellow frame with black handlebars, seat, and tires, plus pro-style BMX frame geometry.
A Sunday Primer 18 Inch Bike (2025) with a red pro-style frame, black handlebars, seat, and tires is parked on a paved surface.
The Sunday Primer 18 Inch Bike (2025), featuring a yellow frame, black handlebars, seat, and tires, is parked on pavement. It offers pro-style geometry for performance and Odyssey Springfield brakes for reliable stopping power.
Close-up of a black handlebar stem with "SUNDAY" engraved, mounted on the red frame of the Sunday Primer 18 Inch Bike (2025) featuring pro-style geometry.
Front view of the Sunday Primer 18 Inch Bike (2025) showing its branded handlebar, left brake lever, Odyssey Springfield brakes, and yellow pro-style frame geometry below.
Close-up of a black seat with "Sunday Bikes" logo on the Sunday Primer 18 Inch Bike (2025), showing a red frame with pro-style geometry, visible graphics, and part of the rear tire.
Close-up of a black handlebar and stem on the yellow Sunday Primer 18 Inch Bike (2025) with pro-style BMX frame geometry, and a tire visible in the background.
Close-up of Odyssey Springfield brakes on the rear wheel of the Sunday Primer 18 Inch Bike (2025), showing the black brake caliper, brake cable, and part of the tire on a red BMX with pro-style frame geometry.
Close-up of a black handlebar grip and brake lever on the Sunday Primer 18 Inch Bike (2025) with pro-style frame geometry, photographed outdoors.
Close-up of the black crank and chainring on the Sunday Primer 18 Inch Bike (2025), attached to a red pro-style frame with the chain on the teeth.
Close-up view of the Sunday Primer 18 Inch Bike (2025) hub with "SUNDAY" branding, surrounded by black spokes and red components, emphasizing its pro-style frame geometry.
The Sunday Primer 18 Inch Bike (2025) is a black BMX featuring thick tires, pro-style frame geometry, straight handlebars, and a padded seat, pictured from the side against a white background.
The Sunday Primer 18 Inch Bike (2025) is a gold BMX with black handlebars, seat, pedals, and wheels. It features pro-style frame geometry and is shown on a white background.
The Sunday Primer 18 Inch Bike (2025) features a purple pro-style BMX frame, black handlebars, seat, and tires, shown side view against a white background.

Highlights

  • Bridges the 16" to 20" gap
  • Shorter chain stay, lighter wheels
  • Fully sealed 9T cassette hub
  • Odyssey Springfield U-brakes

Description

The Sunday Primer 18" is the ideal choice for riders who have outgrown a 16" but are not quite ready for a 20". A shorter chain stay, lighter wheels and size specific, pro style frame geometry make it the go to bike for serious BMXers in this size range.

It is packed with quality parts too. Odyssey Springfield U-brakes, a fully sealed 9T cassette hub, an FSA integrated headset and a KMC S1 chain give reliability you can count on, on Sunday Current 18 x 2.2" tyres front and rear.

Features
  • Bridges the 16" to 20" gap. Size specific, pro style geometry for riders who have outgrown a 16 inch but are not ready for a full size 20.
  • Shorter chain stay, lighter wheels. The bike is easier to throw around, which is what serious riders in this size range are after.
  • Fully sealed 9T cassette hub. A sealed 28H rear hub on a 14mm axle with a 9T driver, geared to suit the wheel size.
  • Odyssey Springfield U-brakes. Aftermarket brakes with an alloy U-brake compatible lever and Odyssey Quik Slic cable.
  • Sunday Freeze front load stem. A 48mm front load stem, 2 piece Sunday bars and Cornerstone grips give a cockpit that feels like the grown up bikes.

Specifications
  • Size: 18" wheels, 18.5" top tube
  • Frame: Sunday Primer, 18.5" top tube, integrated 1-1/8" head tube
  • Top tube: 18.5"
  • Fork: Sunday Primer, 18", 2 piece steerer tube with welded pre-load
  • Headset: FSA integrated 1-1/8" with FSA aluminium cap
  • Stem: Sunday Freeze front load, 48mm
  • Bars: Sunday, 2 piece
  • Grips: Sunday Cornerstone
  • Brakes: Odyssey Springfield U-brake with Odyssey Quik Slic cable
  • Brake lever: Aluminium, U-brake compatible
  • Cranks: 140mm, 3 piece, Cr-Mo
  • Bottom bracket: Sealed, mid, 19mm
  • Sprocket: Sunday Sabertooth v2, 25T, steel
  • Chain: KMC S1
  • Pedals: Wellgo platform, plastic
  • Front hub: Sunday, 28H, low flange, loose ball, 3/8" axle
  • Rear hub: Sunday, 28H, sealed, 14mm axle with 9T driver
  • Spokes: 14g steel, black
  • Rims: P-7X aluminium, 18", 28H
  • Tyres: Sunday Current, 18 x 2.2", front and rear
  • Seat: Sunday Badge, seat and post combo
  • Seat post: Integrated
  • Seat clamp: Sunday

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.

Sunday Primer 18 Inch Bike (2025)

Brand: Sunday SKU:

From

$799.99 AUD

 $859.99 AUD

Or 4 payments of $199.99 AUD with

Recommended Rider Height: 122 to 147 cm

Colour - Fire Engine Red

Top Tube Length - 18.5

18 inch BMX sizing

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 heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"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

18 inch BMX sizing

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 heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"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

Sunday Primer 18 Inch Bike (2025) - Fire Engine Red / 18.5

Discount 7%

Instead of $859.99

$799.99 AUD

Price match request

  • Arrives mostly assembled. Most people finish it in 10 to 20 minutes.
  • Pay in 4 with PayPal on orders under $2,000: 4 interest-free payments of $199.99, one every two weeks, with no late fees. How it works

Bike shipping from $29.99All rates

Free in-store pickup - Brisbane

Availability

18.5
Fire Engine Red
Gloss Yellow
Gloss Black
Metallic Gold
Matte Grape Soda

● In stock at LUXBMX ● With supplier ● Preorder ○ Sold out

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