Sunday Primer 18"

$469.99

The 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.

Key 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, chromoly 
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 
Tires: Sunday Current, 18 x 2.2" (F & R) 
Chain: KMC S1
Approx. Weight: 23.3lbs (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°

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Killer @fitbikeco AM 16” custom build with some @profile_racing wheels going out to @pierceparmer_bmx @heathwilll in Ohio. This rig is built to shred. Let’s get your next dream machine rolling. #circuitbmx
When the dude @ibres says he needs a new build by the weekend we drop everything and make it happen. Decked out with @sandmbicycles @over_roast @credence_bikes and @profile_racing parts. Ready for the track and trails. Thanks for the support Ian! #circuitbmx #supportyourlocalbmxshop
How to build the most bad ass 22” Bike on the market. Step 1 - Use a @sandmbicycles Mad Dog @moeller_chris Frame Step 2 - Use all @sandmbicycles components. Step 3 - @profile_racing Elite Disc Hubset and Cranks. Step 4 - Watch the customer pick up it as stoked as can be. Step 5 - Let us build your next dream bike. #circuitbmx #S&MMadDog #22bmx
@camadult making it look easy at a Providence spot that’s not so easy to ride. 📸 @bobbyproctorbmx #circuitbmx #providence
Long Sleeve shirt season is upon us so we had to come out with something rad for the trails and the track. New “Eat Dust” shirts should be here in a few weeks. Win or Lose, just go fast! #circuitbmx #eatdust #rhodeisland
@chrischildss always focused when cruising Prov Park. 📸 @bobbyproctorbmx #circuitbmx #provpark
Kyle Orrico @drfunknstein dropping the nose at one of the most scenic trail spots out there. I feel another ColoRado trip in the works. 📷 @cantcatchthewind #circuitbmx #trailsrule
Here we go!! Let’s say goodbye to winter the right way by ending it with “The Best Jam Ever” @circuit_bmx_shop @bcavecru @theedgeindoorskatepark are putting this together to bring the fun to New England. Sunday March 2nd. Read the flyer for details. More sponsors to come. Thanks to @deweylamarre for getting this flyer done and for lighting this one up. See you there. #circuitbmx #newenglandbmx #bestjamever
Connecticut shredder/Rhode Island transplant @andrew_macconnie knows the best way to start a new year is with a trip to Rays and a fresh @sandmbicycles @irodetoday Rambler T&T. This machine is woods ready.
2024 @digbmx issue is in the shop and shipping today. Stoked to have Vermonts favorite sugarmaker representing us. @jamie_cooperellis 📸 @cappsie #circuitbmx #digbmx #fdrskatepark
As the year comes to an end and we go into our nineteenth year of running Circuit as a bmx shop,I think about the past year and how amazing it truly was. We want to say thank you for the support in 2024 and we are ready for 2025 with more jams and events to keep the scene thriving. From Vic, Cara and Chris- We love you and we love BMX! #circuitbmx
Where in the world is @alexpm ? He’s in R.I. building up a new rig and heading west to build more bike parks. This dude gets around but we always like when he’s around here. Thanks for the support Alex. New @fitbikeco Matrix Frame and a new @profile_racing wheelset will get you rolling right. #circuitbmx
@elih401 with the deep end roast at the @friendsofnewportskatepark This kid rips!! #circuitbmx #deepend #rhodeisland
Fall is the best time of year to catch some laps in the woods. The temps are perfect and the trails are running fast. @elih401 making a classic table look good in the woods of RI. #circuitbmx #rhodeisland
What do you do when you come out of BMX retirement? You build your dream bike! That’s what we just dude for @nicholashennigar This is a proper @sandmbicycles @irodetoday Rambler decked out with a @profile_racing drivetrain. Thanks for the support Nick!! #circuitbmx #supportyourlocalbmxshop
I’ve been laughing and riding with Don Houle @houlesdoingthings for almost 35 years and I hope to keep doing that for the foreseeable future. Stoked to call Don a friend and to build him up his new @sandmbicycles @credence_bikes @over_roast rig. #circuitbmx #donhoule
Not all rigs are the same. This one is built different. @sandmbicycles @moeller_chris out the door today and ready for some summer fun. #circuitbmx #maddog
The stoke runs deep with @timmy_ike13 and this Circuit Woodsman Build. Now that’s a bike!! Should we do another run of Woodsman Frames? #circuitbmx
@klegraefe Spot Master, Wizard Biker!! #circuitbmx
@krobjrbmx made the move out to Southern California a month ago and he has been making the most of it. Stoked to see what’s to come from this dude. Keep killing it Kev!! #circuitbmx