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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.
The drivetrains on our DXT bikes feature long cage ATB rear derailleurs, full-size triple chainring cranksets and big 11-34 or 32T cassette blocks. This gives you the dual advantage of having high road bike gearing for controlled pedaling at speed on descents and low mountain bike gearing for easier pedaling uphill.
Every DXT offers a full complement of eyelets and rack mounts to simplify installation of carriers and fenders. We even include bosses on the underside of the seatstays for installation of a ring lock. Ring locks are tremendously popular in Europe. A simple turn of the key immobilizes the rear wheel and prevents someone from riding off with your bike.
Proper fit on your bike is critical for maximum performance and comfort. That’s why we offer the ATS patented adjustable threadless steering system on the DXT Elite models. Whether you want to fine tune your ride and establish the perfect fit, or change it regularly to suit different terrain, with this stem, adjusting your handlebar height is as easy as adjusting your seat post height.
The advantage of a suspension fork should be intuitively clear: hit a bump and absorb it. Hit a bump and stay in control of your bike. But suspension isn’t always desirable. When riding on smooth pavement or climbing, pedaling energy and power can be absorbed and dissipated by the movement (bobbing) of the fork. Enter lockout. With a flip of a knob on the top of the fork, the fork’s travel can be locked from movement, allowing the bike to be 100% responsive to pedaling input .
The advantages of disc brakes over rim brakes on a versatile bike like the DXT far exceed their sole disadvantage, weight gain. Besides their incredible power and modulation, they’re just plain safer, especially in the rain. Once rims get wet or muddy, using friction to stop the wheel at its circumference is less efficient than using friction to stop a less wet or muddy small diameter disc near the center of the wheel from rotating. And eliminating the rim from braking surface duties results in a longer lasting wheel
Fully integrated shifting systems offer the most precise and reliable performance. That’s why every DXT offers Shimano shifters, Shimano front and rear derailleurs, Shimano cranksets and Shimano cassettes.
The advantage of large diameter wheels is getting a lot of press these days with all the noise and news about 29’er mountain bikes. We like to think that the DXT is one of the original 29’ers. With big 700c hoops (same as a 29’er) that roll over bumps & holes better than smaller diameter 26” or 27.5” wheels, and with a bigger contact patch for greater traction and control. But in the case of the DXT, with a smaller 40c width & smoother tread that significantly reduces rolling resistance over fatter, knobbier mountain bike tires for faster sailing on streets and paths.
UPGRADES / CHANGES FROM PREVIOUS MODEL
• Shimano 8-speed Acera/Altus group
• Shimano RapidFire SL-M310 shifters and Tektro Levers
• Shimano HG31 8-speed cassette
• KMC Z7 chain
• Jamis Aluminum riser bar
|Frame||6061 aluminum formed top and down tube, 1 1/8” head tube, seat stays disc brake mounts, 34.9mm seat tube, replaceable derailleur hanger, fender/rack eyelets and ring lock munt eyelets|
|Fork||SR/Suntour SF15-NVX HLO, aluminum lowers, coil spring, 28mm stanchions, 1-1/8" steerer, hydraulic lock out, 75mm travel|
|Headset||Internal Cup, 1 1/8”|
|Wheels||Alex TD26 disc specific double wall alloy rims, 36H, alloy disc hubs with QR and 14g stainless steel spokes|
|Tires||CST Dual Sport Tire, 700 x 40c with reflective sidewall|
|Derailleurs||Shimano Acera RD-M360 rear and Altus FD-M310 top swing front|
|Shiftlevers||Shimano Altus Rapid Fire SL-M310, 24-speed|
|Cassette||Shimano HG31, 8-speed, 11-32T|
|Crankset||Shimano FC-TY301, 48/38/28T, 170mm (15-17”), 175mm (19-23”)|
|BB Set||FSA sealed cartridge, 68 x 122.5mm|
|Brakeset||Tektro MD-280 cable-actuated disc brakes with 160mm stainless 6-bolt rotors and Tektro ML-520 levers|
|Handlebar||Jamis Riser bar, steel, 25.4 x 10˚ sweep, 600mm wide, 20mm rise|
|Stem||Jamis Trekking, 3D forged alloy, 35˚ rise, 80mm extension, 180mm high|
|Grips||MTB Type Grip|
|Seat Post||Jamis alloy micro-adjust, 27.2 x 350mm alloy clamp with QR seatpin|
|Saddle||Jamis Touring with SL cover|
|Sizes||15”, 17”, 19”, 21”, 23”|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||FORK RAKE||BB DROP||HEAD TUBE||STANDOVER||STACK||REACH|
|15||23.03 / 585||71˚||73˚||17.52 / 445||42.16 / 1071||1.57 / 40||2.36 / 60||4.13 / 105||28.94 / 735||22.68 / 576||16.06 / 408|
|17||23.62 / 600||71˚||73˚||17.52 / 445||42.75 / 1086||1.57 / 40||2.36 / 60||4.72 / 120||30.24 / 768||23.23 / 590||16.46 / 418|
|19||24.01 / 610||71˚||73˚||17.52 / 445||43.19 / 1097||1.57 / 40||2.36 / 60||5.31 / 135||31.34 / 796||23.78 / 604||16.69 / 424|
|21||24.61 / 625||71˚||73˚||17.52 / 445||43.78 / 1112||1.57 / 40||2.36 / 60||6.10 / 155||32.68 / 830||24.53 / 623||17.05 / 433|
|23||24.80 / 630||71˚||73˚||17.52 / 445||44.01 / 1118||1.57 / 40||2.36 / 60||6.89 / 175||34.05 / 865||21.34 / 542||17.01 / 432|
FIT & SIZING
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