Arktos 27.5 Custom
Featuring Alchemy’s exclusive Sine full-suspension system
The Made in the USA Arktos 27.5 is the flagship of our mountain fleet. Every detail is is painstakingly done in house by Alchemy craftsmen, from the first layer of carbon to the last coat of paint.
// Exclusive Patented Sine Suspension System
The Arktos is a one-of-a-kind, do-it-all full-suspension bike designed to climb and descend with the same aplomb. The Arktos features a patented dual-linkage platform called the Sine Suspension, which was designed by suspension guru David Earle. The Sine name is derived from the way the shock rate, when graphed, resembles a sine wave. With Sine, there is regression through the first part of the travel to absorb small bumps and provide climbing traction, progression in the middle of the stroke to avoid wallowing on big hits or in hard, fast corners, and then slight regression again at end stroke to enable full use of rear wheel travel. Sine is also designed to minimize chainstay growth to improve pedaling efficiency and keep the suspension active under braking.
// Fully Triangulated Rear Swingarm
Modern trail bikes today are being ridden on terrain that only a DH bike would have tackled a few years ago. As a result, the requirements for frame stiffness are increasing every year. Luckily if you are riding an Arktos, you are riding one of the laterally stiffest bikes ever produced, and one of the big reasons for this is the full triangulated rear swingarm. The Arktos by design is made to handle all you can throw at it.
// The Details
They say the devil is in the details, and there’s not doubt we focused on the minutia with the Arktos 27.5. The bike features details like internal cable routing and a direct mount chain guide, as well as every bike features Fox Factory suspension both front and rear. The rear shock has been specially tuned for Alchemy to provide the best in pedaling efficiency and downhill performance and all of the bikes are using stiff and light Fox 36 forks.
|170mm Fork | 39mm Offset Fork|
|Seat Tube Length||420||455||483||518|
|Effective Top Tube||585||600||615||642|
|Head Tube Length||100||110||115||130|
|Head Tube Angle||65.5||65.5||65.5||65.5|
|Seat Tube Angle||73.5||73.5||73.5||73.5|
|Chain Stay Length||438||438||438||438|
|Bottom Bracket Drop||10||10||10||10|
|Bottom Bracket Height||346||346||346||346|
Pricing and specifications subject to change at any time without notice.
|Height||Pant Inseam (inches)||Size|
|5 ft. 1 in. – 5 ft. 4 in.||30||Small|
|5 ft. 5 in. – 5 ft. 8 in.||32||Medium|
|5 ft. 9 in. – 5 ft. 11 in.||34||large|
|≥ 6 ft.||36||Xlarge|
|S||5’1 – 5’5″|
|M||5’5″ – 5’9″|
|L||5’9″ – 6’1″|
|XL||6’1″ – 6’5″|
|Fork||Fox 36 Factory Kashima 160mm Boost 15mm|
|Shock||Fox DPX2 Factory Kashima EVOL LV 3-Position Adjust 8.5×2.5 in, 10X22 mm Hardware|
|Handlebar||ENVE M6 780mm 7.5 Degree 31.8mm|
|Stem||ENVE M6 55mm 31.8mm|
|Seat Post||Fox Transfer Factory w Lever|
|Grips||Ergon GA 20 Black|
|Headset Top||Cane Creek 40-Series IS41 Short Cover – Top – Black|
|Headset Bottom||Cane Creek 40-Series IS52 – Bottom – Black|
|Spacer||Cane Creek 40-Series 5MM Spacer – Black|
|Saddle||WTB Volt Race 142X165|
|Shifters||Shimano XTR M9100 12 Speed|
|Rear Derailleur||Shimano XTR M9120, XTR SGS, 12-SPEED|
|Cassette||Shimano XTR M9100 12-Speed 11-51t|
|Cranks||Shimano XTR FC-M9100-1 32 T 175mm|
|Bottom Bracket||Shimano XTR Threaded|
|Chain||Shimano XTR 12 Speed|
|Brakes||Shimano XTR M9120 Trail Hydraulic|
|Rotors||Shimano XTR M900 180mm Center Lock Ice Tech Rotor|
|Front Wheel||ENVE M630 15/110mm|
|Rear Wheel||ENVE M630 12/157 mm TA DT 240 Boost Shimano Driver|
|Tires||Maxxis Minion DHF 27.5×2.5 DC EXO TR, Maxxis Minion DHR 27.5×2.4 DC EXO TR|
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