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Jamis 2017 Defcon 1 Mountain Bicycle

Tags: Jamis Adventure cycle bicycle defcon mountain 1

Monday, May 29, 2017

Jamis 2017 DEFCON ENDURO All mountain Bicycle Adventure Bicycle Defcon 1.

Youtube video: https://youtu.be/9G0y3P9uHl4


The devil is in the details. This is where the 27.5” wheel size really shines: on a 160mm travel all-mountain enduro machine. Utilizing our proven mp4 suspension for pedaling efficiency, with modern geometry and top-level suspension to tackle bigger hits and aggressive descents at higher speeds. This progressive suspension design delivers plush rear wheel traction while still resisting bottom out. Rear thru-axles, short chainstays and roomy front centers provide stiffness, quick cornering and playful handling. If you want to do it all, fast, this is the bike.


The leverage exerted by the Defcon mp4 suspension is progressive. There are multiple benefits to a more progressive suspension system. The rear shock can be tuned more linearly for a smoother, more plush ride without bottoming. Because the rear shock can be pumped to lower air pressures without performance detriment, shock and seal life are optimized and a greater range of adjustability is available.

Read more about Jamis' approach to suspension >>


The custom one-piece bell crank on the Defcon increases frame stiffness while allowing for the elimination of a seat stay bridge. The absence of a seat stay bridge provides more tire and suspension clearance while creating shorter chain stays and seat stays for even greater stiffness and better handling.


The custom frame tubes on the Defcon are made by SPF Air Forming. SPF is carried out at high air temperatures, where the tube structure is in its most ‘plastic’ and formable state. This allows more complicated shapes to be produced that cannot be made using traditional forming techniques. For example, whereas shape designs can be applied to 25% of the tube using hydroforming, SPF allows up to 90% manipulation. The result: more optimized shapes and less weight.


USA made Enduro® Max sealed bearings sustain 40% more load capacity than standard radial bearings & provide more lateral support for the multiple forces associated with mountain bike pivots. MAX bearings use CRC Marine Grease that will not wash out or breakdown under extreme circumstances.


Our 10mm shock hardware is NOT the standard from our rear shock suppliers. We have to pay more for it and our production lead times are usually increased because we specify it. But the increase in lateral and torsional stiffness for our frames and the rear shock durability and performance is worth every extra dollar and every extra delivery day.


15mm thru-axle QR’s offer all the benefits of the 20mm thru-axle design (stiffness!) + the benefits of the standard 9mm QR system (quick wheel removal!) without any of the down sides. The weight of the 15mm system is similar to the classic 9mm system (thanks to the lightweight alloy axle & reduction in fork leg weight) , but it is nearly as stiff as a 20mm axle. The increase in stiffness improves steering & handling significantly. It also puts less stress on the fork’s internals, improving fork durability and performance.

FrameTriple-butted 6061 air-formed aluminum, 160mm travel mp4 suspension, Enduro® Max sealed bearing pivots, 1.5 - 1 1/8” tapered head tube, asymmetrical chainstays, 12x142mm thru-axle, dropper post routing, ISCG05 chainguide mounts, Fox Float X Factory Series EVOL shock w/3-position compression, Open Mode Adjust & Kashima coating, 10mm hardware, replaceable derailleur hanger, Rock Shox Maxle rear axle

ForkFox 36 Float Factory Series 27.5" w/3-position compression, Open Mode Adjust & Kashima coating,15x110mm axle, air spring, rebound adjust, tapered alloy steerer, 160mm travel

HeadsetFSA Orbit 1.5 Zero-Stack internal cup, 8mm cone spacer

WheelsStan's NoTubes Flow MK3 Team 27.5" tubeless wheels, Neo Series 15x110mm axle front and 12x142mm rear hubs, Sapim Race spokes

TiresVittoria Goma 27.5 x 2.4" front & 2.25” rear, TNT tubeless

DerailleursShimano XT Shadow Plus, 11-speed

Shift leversShimano XT, 1x11-speed

ChainKMC X11SL-1 DLC, 11-speed

CassetteShimano XT M8000, 11-speed, 11-46T

CranksetShimano XT, 11 speed, 32T, 170mm (15"),175mm (17"-21")

BB SetEnduro® BSA


BrakesetShimano Saint M820 hydraulic disc, Ice-Technology pads & 180mm RT86 Ice-Technology 6-bolt rotors

HandlebarAnswer ProTaper Riser, 780mm x 25mm rise, 31.8 mm diameter

StemAnswer ATAC AME, 50mm extension, 31.8mm clamp diameter

GripsJamis Lock-On

Seat PostKS LEV DX, 125mm travel, Southpaw remote

SaddleWTB Volt Comp


Weight31.25 lbs


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