|Frame||Triple-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, X-Fusion 02 Pro RLX High Volume shock w/3-position compression, 10mm hardware, replaceable derailleur hanger, Formula 12 x 142mm axle|
|Fork||X-Fusion Sweep RL2 27.5",15mm axle, air spring compression & lock-out, rebound adjust, tapered alloy steerer, 34mm uppers,160mm travel|
|Headset||FSA Orbit 1.5 Zero-Stack internal cup, for tapered head tube, 8mm cone spacer|
|Wheels||WTB ST i25 TCS 27.5" tubeless rims, Formula sealed bearing centerlock hubs, stainless spokes & brass nipples|
|Tires||Vittoria Goma 27.5 x 2.4" front, Morsa 27.5x2.3 " rear, folding|
|Derailleurs||Shimano Deore Shadow Plus rear and Deore front|
|Shift levers||Shimano Deore, 2x10-speed|
|Chain||Shimano HG54, 10-speed|
|Cassette||Shimano HG50, 10-speed, 11-36T|
|Crankset||Shimano Deore M617, 36/22T, 170mm (15”), 175mm (17-21”)|
|BB Set||Enduro® BSA|
|Brakeset||Shimano Deore M615 hydraulic disc, 180mm RT54 centerlock rotors|
|Handlebar||Loaded Precision X Riser, 760mm x 15mm rise, 31.8 mm diameter|
|Stem||Loaded Precision X, 50mm extension, 31.8mm clamp diameter|
|Seat Post||KS eTen,100mm travel, handlebar remote, 385mm x 31.6|
|Saddle||WTB Volt Sport|
|Sizes||15”, 17”, 19”, 21”|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||BB DROP||HEAD TUBE||STANDOVER||STACK||REACH|
|15||22.4 / 570||66.5˚||73.5˚||17.1 / 435||44.3 / 1126||0.3 / 7||3.9 / 100||28.3 / 719||23.0 / 584||15.5 / 394|
|17||23.4 / 595||66.5˚||73.5˚||17.1 / 435||45.3 / 1151||0.3 / 7||4.3 / 110||29.6 / 751||23.4 / 593||16.3 / 415|
|19||24.4 / 620||66.5˚||73.5˚||17.1 / 435||46.3 / 1176||0.3 / 7||4.7 / 120||30.9 / 784||23.7 / 593||17.2 / 436|
|21||25.4 / 645||66.5˚||73.5˚||17.1 / 435||46.9 / 1191||0.3 / 7||5.1 / 130||32.2 / 817||24.1 / 611||18.0 / 457|
"The Defcon I appears to have ‘always prepared’ as its motto..."
"Could the Defcon I represent what we’re all after: ‘One bike to rule ‘em all.’"
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"This bike, based on spec and my test ride, could go toe-to-toe with any enduro rig out there."
"Every trail obstacle I encountered felt like an absolute cake walk."
"Drops, jumps, chunk, slow speed maneuvers, high speed sections–everything was handled extremely easily."
"If you’re looking for a no-holds-barred enduro bike, with the best of the best components that won’t break the bank, the Defcon 1 is worth a very hard look."
"You may have just found one of the best deals on an aggressive enduro bike on the market."
First Look: 2016 Jamis Defcon
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.
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.
UPGRADES FROM DEFCON 2
• Fox 36 Float and Float X EVOL Factory Series
• Shimano XT drivetrain
• Shimano Saint 4-piston Ice-Tech brakeset
• KS LEV DX dropper seatpost
UPGRADES / CHANGES FROM 2016
• Stan's Flow MK3 wheelset
• Answer cockpit
FIT & SIZING
All our frames and forks are tested continually to meet or exceed (in some cases, well exceed) EN standards 14764, 14765, 14766 and 14781 as well as the new ISO 4210 standards. We conduct these tests at our frame manufacturing facilities, but we also use EN accredited testing laboratories such as Intertek and SGS to verify the results of our own tests. If these tests aren’t telling us everything we want to know about our bikes, we increase the loads and cycles, or we determine another way to test. Where current hydraulic testing machines, jigs and hardware aren’t up to the task of emulating some of the forces and impacts our bikes might be subject to, we’ve designed our own.
We relentlessly cycle test for fatigue from pedaling and torsional forces on every single frame size, with deflection tests for stiffness at every point of the frame. Brutal impact tests with massive weights dropped on fixed frames or forks are performed. Then reversed, with weights attached to the frame, the frame hoisted to a given height depending upon product type, then released.
This destructive testing is enormously instructive and important. And it is in continual process. But it’s our ongoing non-destructive testing of frames and forks fresh off the factory floor that’s just as vital.
For our carbon fiber frames, EVERY frame is weighed to make sure it’s neither resin rich nor resin deficient. We also measure the stiffness of each frame in 6 critical areas as a check on lay-up production. Each deflection test must fall within 5% of the standards our machine and field-testing have established. This weighing and stiffness deflection testing guarantees every single frame we produce meets all Jamis manufacturing protocol and will
deliver the ride qualities we defined and demand.
BBの回転を担うベアリング、そしてリアサスの滑らかな動きを実現するベアリングには、アメリカ製『ENDURO』社のものが使われる。このベアリングは、 リテイナーの表面積を増やしたことで耐荷重性を一般より35~45%アップ。さらにベアリングの両脇をシールで防護しグリスの流出を90%防いでいる。 またカーボンフレームには、磁鉄鉱にて表面加工したMAX BLACK OXI DEを採用。ボールの固さと耐久性を高め、BB、ピボットともに長期間の滑らかな 回転を実現する。