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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.
Lightweight and strong 6061 series aluminum tubing, featuring over-sized & tapered tubing for increased frame stiffness.
The aluminum frame of the Trail X and Helix is beefed up to include a larger 34.9mm seat tube, which allows us to spec an over-sized 31.6mm seat post. The larger diameter post flexes less, providing a firmer pedaling platform.
Running the cables up under the top tube keeps cables and housing out of the muck for more precise and reliable shifting performance.
A Zero Stack internal headset places both the cups and bearings inside the head tube instead of outside. This reduces the total stack height (including the head tube), which is beneficial on larger wheeled bikes. The larger diameter head tube also provides a larger weld interface at the critical head/top/down tube junction.
Most of our Trail X sizes offer two water bottle mounts located inside the main frame. This provides excellent hydration capacity in an easily accessible position.
Because it’s much easier and much less expensive to replace a derailleur hanger than it is to repair or replace a frame, every Trail X and Helix frame offers a replaceable derailleur hanger designed to yield in a crash before the frame does.
Fully integrated shifting systems offer the most precise and reliable performance. That’s why our Trail X and Helix models all offer Shimano shifters, Shimano front and rear derailleurs and Shimano cassettes or freewheels.
Disc hubs twist during braking. This twisting increases “pull” load on the nipples in the spoke bed. The Alex TD26 spoke bed on the rims specified on Expert, Comp and Sport is cleverly reinforced to resist disc brake torque and prevent spokes & nipples from shearing.
UPGRADES / CHANGES FROM 2016
• Updated frame design!
• CST Patrol 2.25" tires
|Frame||6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger|
|Fork||RST Gila 27.5", coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 100mm travel|
|Headset||Zero-stack internal cup threadless, 15mm cone spacer|
|Wheels||Alex ACE-17 double-wall alloy rims, 32H, heavy-duty ATB hubs with QR, stainless spokes|
|Tires||CST Patrol, 27.5 x 2.25”|
|Derailleurs||Shimano TX35 rear and TX50 front|
|Shift levers||Shimano EF41, 3x7-speed|
|Chain||KMC Z51, 7-speed|
|Cassette||Shimano TZ31, 7-speed, 14-34T|
|Crankset||Forged alloy crank, 42/34/24T, 170mm (15") 175mm (17"-21")|
|BB Set||Sealed cartridge|
|Pedals||ATB platform, hi-impact resin|
|Brakeset||Alloy linear pull type with Shimano levers|
|Handlebar||Jamis XC riser, 25.4 x 20mm rise x 620mm|
|Stem||Jamis XC alloy threadless, 25.4 x 15˚ rise x 75mm (15”), 90mm (17"), 90mm (19"), 105mm (21")|
|Seat Post||Jamis alloy micro-adjust, 31.6 x 350mm (15") 400mm (17"-21")|
|Saddle||Jamis ATB Sport, SL cover, protective front and rear guards|
|Sizes||15”, 17”, 19”, 21”|
|Color||Cosmo Blue or Gloss Black|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||BB DROP||HEAD TUBE||STANDOVER|
|15||22.0 / 559||70˚||72.5˚||17.1 / 435||41.3 / 1048||1.8 / 46||3.9 / 100||28.7 / 730|
|17||23.3 / 585||70˚||72.5˚||17.1 / 435||42.3 / 1075||1.8 / 46||4.3 / 110||30.2 / 766|
|19||23.8 / 605||70˚||72.5˚||17.1 / 435||43.1 / 1095||1.8 / 46||5.1 / 130||31.4 / 798|
|21||24.6 / 625||70˚||72.5˚||17.1 / 435||43.9 / 1116||1.8 / 46||5.5 / 140||32.7 / 831|
FIT & SIZING
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