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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.
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 Dyad lay-up schedule employed on our Dakota frames utilizes two different types of high modulus carbon fibers, applied in specific sequences and angles to maximize strength, stiffness and ride quality in the lightest possible package. The Dyad Supreme lay-up on the Team results in a frame that is 20% lighter and 15% stiffer!
We use powerful, state-of-the-art, composite manufacturing software to analyze and perfect our lay-up schedule. The result is optimal stiffness, greater durability and lighter weight.
Its all in the numbers: a 70.5 degree headtube angle for fast responsive steering and stability at speed with no “flip/flop” feel. A 73 degree seat tube angle to puts the rider more directly over the pedals for an optimal pedaling position. With a cool, aggressively sloped top tube for the lowest possible standover on those large diameter wheels and a stiffer, more responsive frame.
Riding fast with control requires steering precision, which starts with the front of the bike. Stiffening this area results in less wheel deflection, more wheel control. A tapered 1 1/8” to 1.5” head tube and steerer serves up a significant increase in rough terrain tracking and stability without much of a weight penalty compared
to standard 1 1/8” systems since the steer tube wall thickness can be reduced. Adding a 15mm QR thru-axle hub/fork interface takes steering precision over the top.
The larger 46mm bore diameter of the Press Fit 30 BB system increases the frame’s bottom bracket shell providing a larger surface that increases frame strength. The key difference with Press Fit 30 is how the bearings are fitted into the frame. Bearings are housed in nylon cups that are pressed into the frame’s bottom bracket shell. Like BB30, Press Fit 30 uses the same oversized bearing that is designed for 30mm spindle cranksets. Advantages of Press Fit 30: Improved bearing-to-shell interface, greater bearing durability and simple installation.
The 1 x11 drivetrain philosophy is to make it simpler, lighter and more durable. Specific chainring tooth profiles, clutch-type rear derailleurs and wide range cassettes are developed for an incredibly wide gear range and maximum control without the need to chain tensioning devices or guides.
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.
Riding fast with control requires steering precision, which starts with the front of the bike. Stiffening this area results in less wheel deflection, more wheel control. A tapered 1 1 /8” to 1 1 /2” head tube and steerer serves up a significant increase in rough terrain tracking and stability without much of a weight penalty compared to standard 1 1 /8” systems since the steer tube wall thickness can be reduced. Adding a 15mm QR thru-axle hub/fork interface takes steering precision over the top.
Benefits of a tubeless set-up are reduced rotating weight and the ability to use lower inflation pressures for greater traction without the risk of pinch flats.
UPGRADES / CHANGES FROM PREVIOUS MODEL
• Shimano M396 brakeset
• 2.25" tires
|Frame||Mid Modulus Dyad Plus carbon fiber, 1.5 - 1 1/8” tapered head tube, PressFit30 BB shell, High Direct Mount (HDM) front derailleur with internal cable routing, post mount disc brakes & 12x142 drop-outs, stainless steel chain stay protector, replaceable derailleur hanger, Formula axle|
|Fork||Rock Shox Recon RL 29", Solo Air spring compression, lever actuated lockout, 15x110mm axle, tapered alloy steerer, external rebound adjust, 100mm travel|
|Headset||FSA Orbit 1.5 Zero-Stack internal bearing, 8mm cone spacer|
|Wheels||WTB ST i23 TCS 29" tubeless rims, Formula sealed bearing 6-bolt hubs, stainless spokes & brass nipples|
|Tires||Vittoria Peyote, 29 x 2.25”, folding|
|Derailleurs||SRAM NX, 11-speed|
|Shift levers||SRAM NX, 1x11-speed|
|Chain||KMC X11-1 EPT (Anti-Rust), 11-speed|
|Cassette||SRAM 1130, 11-speed, 11-42T|
|Crankset||SRAM NX, 32T, 170mm (15"), 175mm (17-21")|
|BB Set||Enduro® PressFit 30|
|Brakeset||Shimano M396 hydraulic disc, 180mm front & 160mm rear RT26 6-bolt rotors|
|Handlebar||Ritchey Trail 2X, 31.8 x 9˚ sweep x +/- 5mm rise x 720mm|
|Stem||Ritchey Trail, 70mm (15"), 80mm (17"), 90mm (19"), 100mm (21")|
|Seat Post||Ritchey Trail Comp, 31.6 x 400mm|
|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||22.6 / 575||70.5˚||73˚||17.2 / 438||42.0 / 1066||22.8 / 58||3.9 / 100||29.6 / 752||23.9 / 608||15.3 / 389|
|17||23.6 / 600||70.5˚||73˚||17.2 / 438||42.8 / 1088||22.8 / 58||4.3 / 110||29.7 / 755||24.3 / 618||16.1 / 410|
|19||24.4 / 620||70.5˚||73˚||17.2 / 438||43.8 / 1112||22.8 / 58||4.53 / 115||30.4 / 773||24.5 / 623||16.9 / 430|
|21||25.2 / 640||70.5˚||73˚||17.2 / 438||44.6 / 1132||22.8 / 58||5.1 / 130||32.2 / 817||25.1 / 638||17.5 / 445|
FIT & SIZING
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