The Sunday Primer 18" BMX Bike is the perfect choice for younger riders who have outgrown a 16" BMX but are not quite ready for a full-size 20" bike. Its race-inspired geometry, lightweight construction and quality components make learning tricks easier while helping riders progress faster at the skatepark and pump track.

Sunday Primer 18" – Key Features

• Recommended rider height: approximately 135–149 cm
• Frame size: 18.5"
• Frame material: Hi-Ten steel
• Cranks: 3-piece 4130 Cr-Mo
• Rear hub: Sealed Cassette with 9T driver
• Brake: Odyssey Springfield U-Brake
• Weight: 10.55 kg
• Skill level: Beginner / Intermediate

A BMX Bike That Makes Progress Easier

The Sunday Primer 18" was developed for young riders who need something bigger than a 16" BMX but are still too small for a full-size 20" model. Its carefully designed geometry offers excellent control, making it easier to learn the fundamentals of BMX riding.

The short rear end and lightweight wheelset make the bike responsive and easy to handle. Whether you're practising bunny hops, manuals or your first jumps, the Primer reacts quickly and inspires confidence from the very first ride.

It is equally at home in the skatepark, on a pump track or during everyday practice sessions, making it an excellent bike for riders looking to improve their skills.

Quality Components Built for BMX Progression

The durable Hi-Ten frame is paired with a strong 3-piece 4130 chromoly crankset that delivers the stiffness and durability needed for regular BMX riding.

A sealed cassette rear hub with a 9T driver provides fast pedal engagement, while the proven Odyssey Springfield U-Brake delivers reliable braking performance. Sunday Current tyres offer excellent grip on concrete, asphalt and pump tracks, giving riders confidence in different riding conditions.

What Rider Size Is It For?

The Sunday Primer 18" features an 18.5" frame and is recommended for riders approximately 135–149 cm tall. It is an ideal transition bike between a 16" BMX and a full-size 20" model.

You can find the complete frame geometry in the geometry diagram below the technical specification.

Ride Protected

BMX riding always comes with the possibility of falls. A properly fitted helmet and quality protective gear help reduce the risk of injury and let you focus on progressing your skills.

Sunday Primer 18" – Full Technical Specification

Frame

• Sunday Primer 18"
• Hi-Ten steel
• Top Tube: 18.5"
• Chainstay: 11.7"–12"
• Head Angle: 74.5°
• Seat Angle: 71°
• Bottom Bracket Height: 10.35"
• Standover Height: 7.5"

Fork

• Sunday Primer 18"
• Hi-Ten 1020 steel

Handlebar

• 2-piece construction
• Hi-Ten 1020 steel
• Rise: 7.65"
• Width: 25.5"
• Backsweep: 12°
• Upsweep: 1°

Stem

• Sunday Freeze
• Aluminium
• Front Load

Headset

• FSA
• Integrated
• Sealed bearings

Wheels

• Rims: P-7X
• Material: Aluminium
• Wheel size: 18"
• 28H

Tyres

• Model: Sunday Current
• Size: 18" × 2.20"

Crankset

• Material: 4130 Cr-Mo
• 3-piece construction
• Length: 140 mm

Bottom Bracket

• MID BB
• 19 mm spindle
• Sealed bearings

Sprocket

• Sunday Sabertooth V2
• 25T

Front Hub

• Sunday Low Flange
• 10 mm (3/8") Cr-Mo axle
• 28H

Rear Hub

• Sunday Cassette
• Sealed bearings
• 14 mm Cr-Mo axle
• 9T Driver
• 28H

Chain

• KMC S1

Brake

• Rear: Odyssey Springfield U-Brake

Brake Lever

• Sunday Junior

Seat

• Sunday Junior
• Combo
• Aluminium seatpost

Seatpost

• Integrated Combo
• Aluminium

Seat Clamp

• Sunday
• Aluminium

Pedals

• Wellgo Junior
• Nylon
• 1/2"

Grips

• Sunday Cornerstone

Weight

• 10.55 kg

Frame geometry:

• Top Tube (TT): 18.5"
• Chainstay (CS): 11.7"–12"
• Head Angle (HA): 74.5°
• Seat Angle (SA): 71°
• Bottom Bracket Height (BB): 10.35"
• Standover Height (SO): 7.5"
• Handlebar Rise: 7.65"
• Handlebar Width: 25.5"
• 1" = 2.54 cm

BMX bikes are regularly exposed to heavy impacts from jumps, landings and tricks. No freestyle bike is indestructible. Regularly inspect the frame, fork, wheels, drivetrain and all bolted connections. Routine maintenance improves safety and helps extend the lifespan of your bike.

Important Information About Your New BMX Bike

• Read the warranty information supplied with your bike before your first ride.
• Your bike is delivered approximately 90% assembled.
• Before riding, install the pedals, handlebar, seat and, if required, the front wheel.
• The manufacturer recommends having the bike inspected by a professional bicycle workshop before the first ride. This paid service is required to keep the manufacturer's warranty valid. Keep your service receipt.

FAQ – Sunday Primer 18"