Sunday Primer 18 Inch Bike (2025)

The Sunday Primer 18” is the ideal choice for riders who’ve outgrown a 16” but aren’t quite ready for a 20”.

The shorter chain stay, lighter wheels and size-specific, pro-style frame geometry makes it the go-to bike for serious BMXers in this size range. The Primer is packed with quality parts like Odyssey Springfield brakes and a fully sealed cassette hub for reliability that you can count on every time.

Features
– 18″ Pro-Style geometry
– Sunday Freeze front load stem
– 9T cassette hub
– Sunday Cornerstone grips
– Odyssey Springfield brakes
– FSA headset
– KMC S1 chain

Specifications
Frame – Sunday ‘Primer’, 18.5″ top tube, integrated 1-1/8″ head tube
Fork – Sunday ‘Primer’, 18″ fork w/ 2-piece steerer tube and welded pre-load
Handlebar – Sunday, 2-piece
Stem – Sunday ‘Freeze’ front load, 48mm
Headset – FSA integrated, 1-1/8″
Alloy Cap – FSA aluminum cap
Brake Lever – Aluminum, U-brake compatible
Brakes – Odyssey ‘Springfield’ U-brake
Brake Cable – Odyssey ‘Quik Slic’
Grips – Sunday ‘Cornerstone’
Seat – Sunday ‘Badge’, seat and post combo
Seat Post – Integrated
Seat Clamp – Sunday
Sprocket – Sunday ‘Sabertooth v2’, 25T, steel
Cranks – 140mm, 3-piece, Cr-Mo
BB Parts – Sealed, Mid, 19mm
Pedals – Wellgo platform, plastic
Rims – P-7X aluminum, 18″, 28H
Front Hub – Sunday, 28H, low-flange, loose-ball, 3/8″ axle
Rear Hub – Sunday, 28H, sealed, 14mm axle w/ 9T Driver
Spokes – 14g steel, black
Tyres – Sunday ‘Current’, 18 x 2.2″ (F & R)
Chain – KMC S1
Approx. Weight – 10.5kgs (with brakes)

Frame Geometry
Top Tube Length – 18.5″
Head Tube Angle – 74.5°
Seat Tube Angle – 71°
Chainstay Length – 11.7-12.00”
Bottom Bracket Height – 10.35″
Standover – 7.5″

Handlebar Geometry
Rise – 7.65″
Width – 25.5″
Backsweep – 12°
Upsweep – 1°