Rootdown 27.5+" 29"

Agile ascender, dominant descender.

Big wheels, all mountain

We updated the Rootdown frame with a combination of longer top tube, shorter chain stay, slacker head angle, steeper seat tube and lower BB. For us it was a significant progression of all mountain hardtail. The new 2018 version continues that legacy further with the additional clearance needed for 27.5 Plus tire compatibility.

Built with our custom-drawn tubes and featuring a 12 X 148 Boost rear end and stealth post routing, this is the evolution of Chromag frame design in 29er form compatible to 27.5+. An agile ascender and a dominant descender that is ready for anything.

TIRE SIZE

29 x 2.5” or 27.5 x 3.0”

TRAVEL

Design optimized for a 160mm fork

WEIGHT

6.5 lbs (Medium, Frame Only)

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.

Dropouts

As 12mm through axles have proven to be solid, reliable and convenient, we have committed most of our models to utilize this format.   Our 12mm dropouts are accurate and tough and feature a removable derailleur hanger with a sturdy interface for strength and reliability.  All 2017 models (excluding Monk and Nice Dreams) will follow the 148mm boost spacing.

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

 

Black/Grey

 

Brown/Tight Orange

 

Green/Tight Green

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 410mm 438mm 452mm 473mm 492mm
Stack  S 647mm 647mm 647mm 647mm 647mm
Stand Over  SO 687mm 695mm  729mm  749mm  784mm 
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  95mm 95mm  95mm  105mm  105mm 
Fork Offset  FO  51mm 51mm  51mm  51mm  51mm 
Wheelbase  WB  1148mm 1175mm  1193mm  1219mm  1238mm 
Seatpost Size 31.6mm
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.

Builds

PARTSGX EAGLE BUILDEAGLE 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 EAGLE 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 SRAM X01 EAGLE
PEDALS - -
PRICE $3,600 CAD
$3,100 USD*
$4,650 CAD
$4,000 USD*
FRAME ONLY $860 CAD
$740 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