The Primer is a serious starter bike at a seriously great price.

Built around a pro-level geometry in a range of top tube sizes, the Primer is spec’d with quality parts like Odyssey Springfield brakes and Path Pro tires. The Primer also includes a fully sealed rear cassette hub and proven parts like the Sunday Freeze Stem and an FSA Headset.

Shops and riders everywhere know that the Primer is the bike to beat in this price range.

Key Features

  • 9t Sealed Cassette Hub
  • Sunday Freeze Front Load Stem
  • Sunday Cornerstone Grips
  • Odyssey Springfield Brakes and Lever
  • Odyssey Path Pro OEM 2.4" Tires
  • FSA Headset
  • KMC S1 Chain

Specifications

Frame: Sunday Primer, 20" top tube, integrated 1-1/8" head tube 
Fork: Sunday Primer, 20" 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: Odyssey Springfield 
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: 160mm, 3-piece, chromoly 
BB Parts: Sealed, Mid, 19mm 
Pedals: Wellgo platform, plastic 
Rims: P-7X aluminum, 20", 36H 
Front Hub: Sunday, 36H, low-flange, loose-ball, 3/8" axle 
Rear Hub: Sunday, 36H, sealed, 14mm axle w/ 9T Driver 
Spokes: 14g steel, black 
Tires: Odyssey Path Pro OEM, 20 x 2.4" (F & R) 
Chain: KMC S1
Approx. Weight: 25.8lbs (with brakes)

Frame Geometry 

Top Tube Length: 20"
Head Tube Angle: 75° 
Seat Tube Angle: 71° 
Chainstay Length: 13.2-13.5” 
Bottom Bracket Height: 11.5" 
Standover: 8.75" 

Handlebar Geometry 

Rise: 9" 
Width: 28.5" 
Backsweep: 12° 
Upsweep: 

Sunday

Primer BMX Bike - 20"TT Gloss Blue

$489.99

Size Guide

Choosing the right size BMX bike is crucial for comfort, control, and performance. This guide will help you understand the ideal tire size and top tube length based on age ranges to ensure a perfect fit for riders of all ages.

Age Ranges and Recommended BMX Bike Sizes

  1. Ages 2-5 (12" Tire)

    • Tire Size: 12 inches
    • Top Tube Length: 12-13.5 inches
    • Description: These bikes are designed for the youngest riders, offering stability and easy handling to help them learn the basics.
  2. Ages 5-7 (14" Tire)

    • Tire Size: 14 inches
    • Top Tube Length: 14-15.5 inches
    • Description: Slightly larger than the 12" bikes, these are ideal for children gaining confidence and control.
  3. Ages 7-9 (16" Tire)

    • Tire Size: 16 inches
    • Top Tube Length: 16-17.5 inches
    • Description: Suitable for young riders developing their skills and needing a bit more space for comfort.
  4. Ages 9-12 (18" Tire)

    • Tire Size: 18 inches
    • Top Tube Length: 17-18.5 inches
    • Description: Perfect for pre-teens who are serious about riding and need a bike that offers more stability and control.
  5. Ages 12-14 (20" Tire)

    • Tire Size: 20 inches
    • Top Tube Length: 18-19.5 inches
    • Description: This size is common among teenage riders and provides a good balance of control and agility.
  6. Ages 14+ (20" Tire)

    • Tire Size: 20 inches
    • Top Tube Length: 20-21.5 inches
    • Description: For older teens and adults, the 20" bike with a longer top tube offers enhanced performance for tricks and stunts.

BMX Bike Size Chart

Age Range Tire Size Top Tube Length
2-5 12 inches 12-13.5 inches
5-7 14 inches 14-15.5 inches
7-9 16 inches 16-17.5 inches
9-12 18 inches 17-18.5 inches
12-14 20 inches 18-19.5 inches
14+ 20 inches 20-21.5 inches

 

Additional Tips for Choosing the Right BMX Bike

  • Consider Growth: For growing children, consider a bike that allows for some adjustment in the seat and handlebars.
  • Safety Gear: Ensure the rider has proper safety gear, including a helmet, gloves, and pads, especially for younger riders.

Selecting the right BMX bike size based on tire size and top tube length will enhance the riding experience, offering better control, comfort, and safety. Use this guide to find the perfect fit for riders of all ages. Happy riding!

Low stock (1 left)
PRO SETUP Expert Assembly 95% Ready to ride out of the box.
CERTIFIED Master Mechanic Assembly Precision dialed before shipping.
SINCE 1992 Over 30 Years of Trust Decades of cycling expertise.

SKU: SBX-2558-SUBU

The Primer is a serious starter bike at a seriously great price.

Built around a pro-level geometry in a range of top tube sizes, the Primer is spec’d with quality parts like Odyssey Springfield brakes and Path Pro tires. The Primer also includes a fully sealed rear cassette hub and proven parts like the Sunday Freeze Stem and an FSA Headset.

Shops and riders everywhere know that the Primer is the bike to beat in this price range.

Key Features

  • 9t Sealed Cassette Hub
  • Sunday Freeze Front Load Stem
  • Sunday Cornerstone Grips
  • Odyssey Springfield Brakes and Lever
  • Odyssey Path Pro OEM 2.4" Tires
  • FSA Headset
  • KMC S1 Chain

Specifications

Frame: Sunday Primer, 20" top tube, integrated 1-1/8" head tube 
Fork: Sunday Primer, 20" 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: Odyssey Springfield 
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: 160mm, 3-piece, chromoly 
BB Parts: Sealed, Mid, 19mm 
Pedals: Wellgo platform, plastic 
Rims: P-7X aluminum, 20", 36H 
Front Hub: Sunday, 36H, low-flange, loose-ball, 3/8" axle 
Rear Hub: Sunday, 36H, sealed, 14mm axle w/ 9T Driver 
Spokes: 14g steel, black 
Tires: Odyssey Path Pro OEM, 20 x 2.4" (F & R) 
Chain: KMC S1
Approx. Weight: 25.8lbs (with brakes)

Frame Geometry 

Top Tube Length: 20"
Head Tube Angle: 75° 
Seat Tube Angle: 71° 
Chainstay Length: 13.2-13.5” 
Bottom Bracket Height: 11.5" 
Standover: 8.75" 

Handlebar Geometry 

Rise: 9" 
Width: 28.5" 
Backsweep: 12° 
Upsweep: