Primer Frame

$1,900   CAD

The ‘Primer’ is a bike built for 29 or 27.5+ wheels with geometry designed for aggressive all mountain riding. It is handbuilt in Canada by local fabricator Mike Truelove, in small batches that are painted individually for each customer.

The Primer uses what we would describe as our most progressive 29er geometry to date. The shortest stays possible. Lower than ever BB height. A steep seattube with a slack head angle, low stack headtube and long front center. This combination is the best descending 29er we’ve ridden yet but it still climbs as well as anything we’ve built before.

Building a frame with 27.5+ compatibility means that we had to redesign our ‘yokel’ junction to maximize the chainstay layout clearance. Incorporating a BB92 bb shell and boost dropout spacing also accommodates the most room possible for tire widths as wide as 3.0.

  • Looking to spend a little less? Check out the Rootdown.
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Only 1 piece in stock!


Due to the fact this item is custom painted, lead times may vary.
If you select a raw option, we'll be in touch about your paint job and delivery date once you complete checkout. Woo!

Almost all Chromag frames are made from quality 4130 chromoly steel tubing. Chromoly is an abbreviation for chromium-molybdenum indicating the materials that the steel is alloyed with.

The added chromium helps increase the steels hardenability and also provide some corrosion resistance.
The molybdenum helps to increase the toughness of the steel.

It has a high tensile strength but is also malleable which is what gives our frames their notorious ride quality and feel. Chromoly is often used when more strength is required than that of mild carbon steel.

It falls under the AISI (American Iron & Steel Institute) 41XX designations which is where the “41” comes from. The “30” indicates it contains approximately 0.30% carbon by weight.

Chromoly is much stronger than traditional 1020 steel and it has a higher strength to weight ratio and high tensile strength, which means we can use less material and achieve a product that can withstand the abuse that riders love to throw at it.

Chromag 4130 Tubing

  S M M/L L XL
Typical Rider Height 5'2"-5'7 5'5"-5'10 5'8"-6'2" 6'-6'4" 6'3"-6'7"
Top Tube Length (Effective)  TTL 572mm 590mm 614mm 637mm 656mm
Seat Tube Length  STL 381mm 419mm 445mm 470mm 508mm
Reach  R 415mm 433mm 457mm 478mm 497mm
Stack  S 630mm
Stand Over  SO 687mm 695mm  735mm  750mm  775mm 
Head Tube Angle  HTA 64°
Seat Tube Angle  STA 76°
Chain Stay Length  CSL 415mm
Bottom Bracket Height  BBH 29" - 320mm   //   27.5x3.0" - 317mm   //   27.5x2.8" - 315mm
Head Tube Length  HTL 105mm
Fork Offset  FO 42mm
Wheelbase  WB 1166mm 1184mm  1208mm  1233mm  1252mm 
Seatpost Size 31.6mm. Stealth Routing.
Seatclamp Size 35mm
Headset Size 44mm-56mm tapered
BB Shell BB92 (press fit)
Rear Axle 184mm, M12 x 1.75mm (Boost 148 Spacing) - Included
*Measured with a 160mm fork. Optimal 140-160mm. Measurements in mm.
PARTS GX EAGLE BUILD EAGLE XO1 BUILD
FORK Rock Shox LYRIK RC 160 SA
Boost 110x15mm
Rock Shox LYRIK RC 160 SA
Boost 110x15mm
STEM Chromag HiFi 40mm Chromag HiFi 40mm
HANDLEBAR Fubars OSX 25mm Rise Fubars OSX 25mm Rise
HEADSET Cane Creek Forty ZS Cane Creek Forty ZS
CRANK SRAM GX-1400 1x X-SYNC SRAM X1 EAGLE Carbon
BRAKES SRAM Guide RS B1 SRAM Guide RSC B1
ROTORS 180mm Centreline 180mm Centreline
SHIFTERS SRAM GX 12 SPD SRAM X01 EAGLE
CASSETTE SRAM XG-1275 SRAM XG-1295 EAGLE 10-50
REAR DERAILLEUR SRAM GX 1X12 SRAM X01 EAGLE 1X12
WHEELSET CHROMAG BA30 Rims with CHROMAG MAGNA Hubs 27.5+ or 29 CHROMAG BA30 Rims with CHROMAG MAGNA Hubs 27.5+ or 29
TIRES Maxxis Minion Fr/Minion Rr Maxxis Minion Fr/Minion Rr
SEATPOST Chromag Dolomite Chromag Dolomite
SADDLE Chromag Trailmaster DT Chromag Trailmaster DT
GRIPS Chromag Squarewave Chromag Squarewave
CHAIN SRAM GX EAGLE X01 EAGLE 
PEDALS - -
PRICE $4,999 CAD
$4,300 USD*
$6,090 CAD
$5,250 USD*
FRAME ONLY $1,900 CAD
$1,650 USD*
 
  RockShox Reverb Seat Dropper optional.
*US pricing applies to all US and International purchases.

To purchase a complete build, please contact us directly. We are happy to answer all your questions about our bikes and products. Call: 604-905-6667 Email: info@chromagbikes.com