ADAPTIVE CABLE ENTRY
Before electronic shifting was a commercial reality, we were torn on the benefits of internal cable routing. The advantages – stunningly clean aesthetics, no cable stops to chip, ostensibly cleaner cabling systems – were counter-balanced by its chief disadvantages – the extra weight and friction of full-length housing or interior guide tubes and the labor-intensive challenges of installation and replacement. Given our engineering emphasis on performance-first design, we previously outfitted our road-racing Xeniths with externally routed gear and brake cabling. It was light. It was simple. It was easy to maintain.
But with electronic shifting, it makes much more sense to run everything inside. Attaching and affixing wiring and harnesses externally is every bit as laborious (think cable ties, adhesives and external mounts) as running them internally, where they are much more protected as well. Not to mention, running this stuff inside just looks right.
Which is why every 2014 Xenith is equipped with our new Adaptive Cable Entry system. ACE allows our frames to elegantly and easily manage the internal routing of brake and derailleur cable housing OR electronic Di2 wiring. Xenith models specified with standard cable-actuated drivetrains will be outfitted with ACE plates with integrated cable stops. But we also include with every bike an extra set of ACE plates for Di2 wiring should you ever wish to make the jump to electronic shifting.
PRESS-FIT 30 AND BB386EVO
There are a number of BB standards in the bike industry right now. Here is what you will find on our bikes, and why.
Traditional: The BSA standard. The standard forever. A steel BB spindle, 17mm in diameter, turns within a 68mm or 73 mm shell and upon sealed cartridge ball bearings that are threaded into the BB shell. Not particularly light, not especially stiff (by today’s standards), but reliably durable and definitely cost effective.
External Bearing: The BB shell is still 68mm or 73mm wide and just under 35mm in diameter, but the bearings have been moved outside the BB shell (Shimano Hollowtech II, SRAM GXP, FSA MegaExo). This allows the spindle diameter to be increased over 40% to 24mm and hollowed for a huge stiffness increase with a significant weight reduction. The larger diameter spindle does not compromise bearing size because all bearings now reside outside the frame. The spindle is also better supported with bearings nearer its ends rather than its center.
PressFit30: PressFit30 (SRAM) is a derivative of the BB30 (FSA) system. BB30 increases the spindle diameter to a whopping 30mm for the ultimate in stiffness. But because the BB shell’s inside diameter is also increased from just under 34mm to 42mm, bearing size is not compromised. The challenge with BB30 is that bearings are pressed directly into the frame, leading to durability issues if there are any frame or bearing tolerance deviations. The beauty of the PF30 system is that bearings are housed in nylon cups that are pressed into the frame’s bottom bracket shell. Bottom-line advantages of the PF30 system over BB30? Improved bearing-to-shell interface, greater bearing durability and simplified installation.
BB386EVO: The BB386 EVO bottom bracket design amplifies the benefits of the proven BB30 and PF30 system. It takes the lighter, stiffer 30mm alloy spindle from the BB30 design, incorporates press-fit bearing cups from the PF30 system and marries both to a wider 86.5mm BB shell (which is the same width as on a standard 68mm shell with external bearings). All without changing Q-factor. Why a wider shell? It allows us to increase the diameter of our seat and down tubes at the BB shell a full 30%, for increased stiffness where you really need it. We can also optimize chainstay design with an increased diameter that doesn’t crowd the rear tire.
Last year, we made the switch to USA made Enduro Bearings in the bottom brackets on many of our high-performance level models. Why? Because they are the experts when it comes to obsessing about bearings! Enduro Bearings pioneered MAX type bearings, a design previously only used for large equipment such as forklifts and earth movers almost 20 years ago for bicycles to address the challenges associated with mountain bike pivots.
By filling the races with balls, these bearings have 35-40% more load capacity than standard radial bearings. They accomplish this with a special design where the maximum number of balls are inserted into the bearing. The race grooves are deeper on these bearings for more lateral support for the twisting and multiple forces associated with mountain bike pivots. LLU seals give maximum protection against the elements while keeping the 90% fill of Almagard Extra High Pressure Grease inside. We also specify MAX BLACK OXIDE bearings in our carbon frames which get an additional Magnetite treatment for hardness, rust resistance and even more reliability.
In addition to these BB bearings, we’ve also gone ahead and made these bearings standard on our MP4 suspension bikes. The result for you is a much more active and quick rear suspension, eliminating play and wag all at the same time. Out of the box, our DEFCON & XCT suspension bikes with Enduro’s MAX bearings will save you time and money, as they will perform well 2 or 3 times longer than off the shelf bearings.
TAKING IT TO THE LIMIT
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.
|Frame||High Modulus Omniad Elite M30 carbon fiber, 130mm travel mp4 suspension, Press Fit 30 bottom bracket, 12 x 142 rear dropouts, 1.5 – 1 1/8” tapered head tube, dropper post routing, high direct mount front derailleur, asymmetrical chainstays, stainless steel chain stay protector, Enduro® Max Black Oxide sealed bearing pivots, Fox Float DPS Factory Series EVOL shock w/3-position compression Open Mode Adjust, Kashima coating, 10mm shock hardware, replaceable derailleur hanger, Rock Shox Maxle axle|
|Fork||Fox 34 Float Factory Series 27.5" w/3-position compression, Open Mode Adjust & Kashima coating,15x110mm axle, air spring, rebound adjust, tapered alloy steerer, 130mm travel|
|Headset||FSA Orbit 1.5 Zero-Stack internal bearing, 8mm cone spacer|
|Wheels||Stan’s NoTubes Arch MK3 Team 27.5" tubeless wheels, Neo Series 15x110mm axle front and 12x142mm rear hubs, Sapim Custom Force spokes|
|Tires||Vittoria Goma, 27.5 x 2.25", TNT tubeless|
|Derailleurs||Shimano XT M8000 Shadow Plus, 11-speed|
|Shift levers||Shimano XT M8000, 1×11-speed|
|Chain||KMC X11SL-1 DLC, 11-speed|
|Cassette||Shimano XTM8000, 11-speed, 11-46T|
|Crankset||Shimano XT M8000, 32T, 170mm (15”), 175mm (17-21”)|
|BB Set||Enduro® PressFit 30|
|Brakeset||Shimano XT M8000 hydraulic disc, Ice-Technology pads & 180mm front/160mm rear RT86 Ice-Technology 6-bolt rotors|
|Handlebar||Ritchey Trail WCS Carbon, 740mm x 15mm rise, 9˚ sweep|
|Stem||Ritchey Trail WCS, 70mm (15”), 80mm (17”), 90mm (19"), 100mm (21”)|
|Seat Post||KS LEV Integra, 125mm travel, Southpaw remote|
|Saddle||WTB Volt Comp|
|Sizes||15”, 17”, 19”, 21”|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||BB DROP||HEAD TUBE||STANDOVER||STACK||REACH|
|15||22.2 / 563||71˚||74˚||17.9 / 455||42.8 / 1086||1.4 / 35||4.1 / 105||31.2 / 793||23.4 / 594||15.4 / 391|
|17||23.0 / 585||71˚||74˚||17.9 / 455||43.4 / 1103||1.4 / 35||4.3 / 110||31.6 / 803||23.6 / 599||16.2 / 412|
|19||24.0 / 610||71˚||74˚||17.9 / 455||44.6 / 1133||1.4 / 35||4.3 / 110||31.9 / 812||23.6 / 599||17.2 / 437|
|21||24.7 / 627||71˚||74˚||17.9 / 455||45.3 / 1150||1.4 / 35||4.7 / 120||32.3 / 821||23.9 / 608||17.7 / 450|
The leverage exerted by the XCT’s mp4 suspension design is progressive. There are multiple benefits to a more progressive suspension system. The rear shock can be tuned more linearly and pumped to lower air pressures 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 with a more linear shock tune and reduced air pressure, less rebound damping is required, so a greater range of adjustability is available.
Read more about Jamis’ approach to suspension >>
2.6-to-1 Shock Leverage Ratio
There are multiple benefits of a low wheel-travel-to-shock-stroke ratio. Longer shock and seal life because shocks can be pumped to lower air pressures without performance detriment. Less rebound damping is required, so more range of adjustability is available. And the lower leverage ratio is going to be more plush on bigger hits.
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.
10mm Shock Hardware
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.
Why THRU Axles?
Securing the rear wheel to the frame by threading a 12mm axle into the rear drop-outs is not only safer, it’s stiffer. The rear wheel tracks directly in line with the frame, for more precise handling, so you can go faster with more confidence. The increase in stiffness of a 15mm fork axle improves steering & handling significantly. It also puts less stress on the fork’s internals, improving fork durability and performance. The hub drop outs provide a self centering feature for the wheel for fast, easy installation.
UPGRADES FROM DAKAR XCT RACE
• Fox Factory Series suspension
• Shimano XT 1×11 drivetrain & brakes
• Stan’s Arch MK3 wheelset
• KS LEV DX dropper seatpost
UPGRADES / CHANGES FROM 2016
• Fox Factory Series suspension
• Shimano XT 1×11 drivetrain & brakes
• Stan’s Arch MK3 wheelset
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