Primer 27.5+" / 29"

Aggressive all mountain riding.

27.5"+ 29"

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.

HANDMADE

By Mike Truelove,
in British Columbia, Canada.

WEIGHT

6.3lbs (Medium, Frame Only)

TIRE SIZE

29 x 2.5” or 27.5 x 3.0”

TRAVEL

Design optimized for a 160mm fork

REAR SPACING

12x148 Boost

Features

Head Tube Badge

Bikes are special. The headtube badge is the finishing touch so we’ve always made a point of taking the time to do something interesting with it. Our headtube badges have changed over the years and are an indication of the time each bike was made. Whether it’s a cast bronze, or polished stainless steel, water cut aluminum or a 3D CNC carving, each one represents our commitment to detail.

Chromoly Tubing

Making modern chromoly frames is challenging when most of the tubes available on the market are from an era of mountain biking long past. After several years of frame production we reached the point where we could design and produce our own custom tubing for the majority of our frame tubes. This contributes to the unique look of many of our frames but more importantly allows us to configure our bikes exactly as we want for each design.

Yokel

Our ‘Yokel’ design is a small machined junction on the chainstay that helps accommodate both tire clearance and chainring clearance. Our first versions were huge CNC yokes that bridged the entire front end of the chainstays. Over time we refined this to minimize weight by arranging our chainstay layout asymmetrically and reducing the yoke to a minimal size. It’s one of our most unique frame features and has been copied by other frame makers.

Colours

 

Custom Colour Choice

Geometry

 SMM/LLXL
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 578mm 603mm 622mm 648mm 667mm
Seat Tube Length  STL 394mm 431mm 470mm 495mm 533mm
Reach  R 418mm 443mm 462mm 488mm 507mm
Stack  S 642mm 642mm 642mm 642mm 642mm
Stand Over  SO  687mm 695mm  735mm  750mm  775mm 
Head Tube Angle  HTA 65° 65° 65° 65° 65°
Seat Tube Angle  STA 75° 75° 75° 75° 75°
Chain Stay Length  CSL 415mm 415mm 415mm 415mm 415mm
Bottom Bracket Height  BBH 29"           | 320mm
27.5x3.0" | 317mm
27.5x2.8" | 315mm
Head Tube Length  HTL 105mm 105mm 105mm 105mm 105mm
Fork Offset  FO  51mm 51mm  51mm  51mm  51mm 
Wheelbase  WB  1154mm 1179mm  1198mm  1206mm  1225mm 
Seatpost Size 31.6mm with Stealth Routing
Seatclamp Size 35mm
Headset Size 44mm-56mm tapered
BB Shell BB92 (press fit)
*Measured with a 160mm fork. Optimal 140-160mm. Measurements in mm.

Builds

PARTSGX EAGLE BUILDEAGLE XO1 BUILD
FORK Rock Shox LYRIK RC 160 SA Rock Shox LYRIK RC 160 SA
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 $4,900 CAD
$4,250 USD*
$5,950 CAD
$5,150 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, 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