Description
The Sunday 18" Primer AL is for younger riders who have outgrown a 16" but are not quite ready for a full-size 20" BMX.
The updated aluminium frame trims weight while keeping Sunday’s scaled freestyle geometry, giving progressing riders a proper BMX feel in the in-between wheel size.
Specifications
Key fit measurements first, followed by the full build detail available for this bike. Variant-specific specifications should be checked against the selected option.
Bike & Fit
- Riding Style:
- Freestyle BMX
- Wheel Size:
- 18"
- Top Tube:
- 18.5"
- Model Year:
- 2026
- Weight:
- 10.57 kg
Frame & Cockpit
- Handlebar Rise:
- 7.65"
- Handlebar Width:
- 25.5"
- Headset Type:
- Integrated
Drivetrain
- Crank Length:
- 140 mm
- Spindle Diameter:
- 19 mm
- Bottom Bracket:
- MID
- Gearing:
- 25T
Wheels & Tyres
- Tyre Size:
- 18 x 2.3"
- Axle Standard:
- Front: 3/8" / Rear: 14 mm
- Hub System:
- Cassette
- Driver Size:
- 9T
- Spoke Hole Count:
- 28
Brakes
- Brake Position:
- Rear
- Brake Mount:
- U-brake / 990
Seating
- Seat Mount:
- Integrated Combo
About SUNDAY
Sunday Bikes launched in 2005 with a clear engineering focus: solve the durability problems BMX frames were experiencing as riding became harder and more technical. The brand became known for putting unusual attention into frame construction, tubing and manufacturing details, then carried that same approach into complete bikes and aftermarket components. Sunday’s range now covers youth bikes through to pro-level completes, frames and parts for modern freestyle BMX, with geometry...
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