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 2019 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.
To purchase this item please contact us or visit your local bike shop.
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.
|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|
|Stand Over SO||687mm||695mm||729mm||749mm||784mm|
|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||95mm||95mm||95mm||105mm||105mm|
|Fork Offset FO||42mm|
|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
|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 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|
|FRAME ONLY||$870 CAD
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: email@example.com
Your bike is special. The head tube badge is the finishing touch so we’ve always made a point of taking the time to do something interesting with it. Our head tube 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.
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.