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ENHANCED COMPLIANCE OFFSET
A fork’s sole purpose is to secure and steer the front wheel. But there’s a whole lot of engineering involved in making sure your bike doesn’t just steer, but steers “just right”. Not too sluggish. Not too twitchy. And has sufficient lateral and torsional stiffness to hold a line at speed, under turning loads, while still being able to dampen road vibration for comfort and control.
One of the chief variables between forks is a measurement called “rake”. Rake refers to the curvature or angle of the fork blades as measured from the center of the steer tube to the center of the dropouts. More rake for any given head tube angle will equate to faster steering, with less input required to make the bike turn. But steering characteristics are not determined by rake alone. It is “trail”, a measurement calculated from wheel size, head angle AND fork rake, which tells us how fast a bike will actually steer. More trail yields slower steering, less trail produces faster steering.
One of our design goals for the Renegae, Endura and Ventura was to increase fork compliance for greater comfort and control, without changing its’ already optimal steering characteristics, lateral stiffness or torsional rigidity. Torsional rigidity in a fork is crucial. A torsionally flexible fork will slow steering on descents and fast corners. There will be a noticeable lag between handlebar input and the bike’s reaction.
We accomplished our goals with E.C.O. -- Enhanced Compliance Offset. The fork blades on Renegade, Endura and Ventura model’s are swept forward a few millimeters to reduce the angle of the fork leg to the road, which increases vertical compliance for a more comfortable and controlled ride. A reinforcing rib on the inside of the fork legs assures both lateral and torsional stiffness. Most importantly, the “just right” handling traits remain unchanged, even with the more forward bent fork blades, because the ECO trailing dropout design negates the increase in fork rake, thereby retaining the original trail and optimal steering characteristics.
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.
Size Specific Design (SSD) is the Jamis design philosophy and technique used to create the best possible riding bike for each size rider. Rather than limiting frame size variations to just different length top, seat and head tubes lengths, we take an all-inclusive look at each frame’s total configuration. We start by plotting stack and reach--the two most critical coordinates in bike fitting. Stack is the vertical line measurement from the BB center to the (real or imaginary) horizontal TT line. Reach is the horizontal line from head tube center to the vertical BB line. The two create an inverted “L” to then build outward from.
With SSD we offer four different BB drops and three rear centers (or rear triangles) in addition to the natural variety in tube lengths as bikes move from size-to-size. This approach to frame making helps create an effective custom “ride” for each size bike. For example, consider that crank arm lengths vary as bikes get taller or shorter, yet without changing the BB drop to accommodate this, a rider sits higher or lower. This can have a very real affect on a bike’s ride characteristics and overall handling. The same rule applies to the rear center of the frame.
Just the right amount of fork offset and trail round out SSD’s geometric equation. We have two different fork offsets for each model and with the tire versatility of the Renegades we have added a third to keep steering precise no matter the tire size choice.
Our Size Specific Tubing (SST) that we pioneered back in 1988 also plays a key role in our new SSD technology. By building with a variety of frame size specific main tubes and seatstays, SST helps contribute to a highly optimized ride and assures the lightest possible weight in each case.
Starting with a wide and consistent stack and reach range, we set out to design a frame that could handle on or off road conditions while maintaining a comfortable ride. As you start to review the geo chart you will noticed we have 3 different fork offsets, BB drops and rear center measurements. Add size specific tubing and 2 different sized rear triangles and you have what we feel is the perfect endurance geo for all sized riders. The reason for this is that we wanted the 48 and 61 to fit the rider correctly and make the geo changes needed to provide the perfect ride.
Size Specific Design (SSD) is the Jamis design philosophy and technique used to create the best possible riding bike for each size rider. Rather than limiting frame size variations to just different length top, seat and head tubes lengths, we take an all-inclusive look at each frame’s total configuration. Every SSD frame will also feature size-specific BB drop, rear center, fork offset/trail and SST technology.
With endurance geometry designed to go anywhere the only choice was disc brakes. We even took it up a step with both the Renegade Elite and Expert coming with Hydraulic brakes. With hydraulic disc brakes you will have the most consistent and confidence-inspiring braking available. Just think about jamming down hill on a rutted out fire road with your hands all over the hoods…the power & modulation benefits of hydraulic disc brakes become readily apparent.
We should call them magic mounts. With a collection of fork and frame mounts you can easily choose to mount fenders or a rear carrier. This opens up options when the weather goes bad or can even turn Renegade into a commuter.
Tubeless and wider rims across the range provide great benefits on any terrain. The tubeless benefits are to help prevent flats with sealant as well as being able to adjust your tire pressure for the perfect ride. For example on dirt roads you may want to reduce the tire pressure to increase your contact patch for better grip without the worry of pinch flatting. The beauty of the wider rims effectively gives you a constant and wide tire surface yielding better handling, stability and confidence with plenty of surface grip for control.
UPGRADES/CHANGES FROM 2016
• WTB i23 STP disc rim with TCS (UST Tubeless Compliant System)
• Clement X Plor MSO 700 x 36c, 30TPI with protection belt
• Shimano HG41 8-speed 11-32T
• FSA Vero compact double, 50/34T
|Frame||Jamis Adventure Frame Geo, 6061 aluminum double-butted SST main frame, top tube mounted full cable housing, 1 1/8-1.5" tapered head tube, 31.8mm seat tube for 27.2 seat post, seat stay disc brake mounts, replaceable derailleur hanger, accepts 3 waterbottles, rack and fender mount eyelets, mud clearance and able to fit 40c tires|
|Fork||Jamis Adventure 6061 aluminum, tapered chromoly steerer, integrated cable cradles with post disc brake mounts and fender eyelets|
|Headset||FSA Orbit C-40B Internal/External, 1.5 - 1 1/8”|
|Wheels||WTB i23 STP disc rims with TCS (UST Tubeless Compliant System), 32H, Formula alloy 6-bolt hubs and 14g stainless steel spokes|
|Tires||Clement X Plor MSO 700 x 36c, 30TPI with protection belt|
|Derailleurs||Shimano Claris RD-2400 rear and Claris FD-2400 front with 28.6mm alloy clamp|
|Shiftlevers||Shimano Claris ST-2400 Dual Control STI, 16-speed|
|Cassette||Shimano HG41 8-speed, 11-32T|
|Crankset||FSA Vero, 50/34T, 165mm (48), 170mm (51) 172.5mm (54/56) 175mm (58/61)|
|BB Set||FSA sealed cartridge, 68 x 110.5mm|
|Brakeset||Tektro Lyra mechanical cable actuated disc brake with 160mm wave rotors and Shimano Claris ST-2400 levers|
|Handlebar||Ritchey Evomax Comp, 6061 aluminum, 73 reach, 120 drop with 12° flare, 31.8 x 420 (48-51) 440mm (54-56), 460mm (56-61)|
|Stem||Jamis Road 3D forged 6061 alloy, 7˚ x 80mm (48/51), 90mm (54/56), 110mm (58/61)|
|Tape||Jamis suede tape|
|Seat Post||Jamis Road, micro-adjust, 27.2 x 350mm cromo seat pin|
|Saddle||Jamis Road with SL top, front and rear bumpers and satin steel rails|
|Sizes||48, 51, 54, 56, 58, 61cm|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||FORK RAKE||BB DROP||HEAD TUBE||STANDOVER||STACK||REACH|
|48||20.43 / 519||70.5˚||73˚||16.81 / 427||39.25 / 997||2.24 / 57||2.89 / 73.5||3.27 / 83||28.50 / 724||20.27 / 515||14.17 / 360|
|51||21.02 / 534||71˚||73˚||16.81 / 427||39.57 / 1005||2.09 / 53||2.89 / 73.5||3.94 / 100||29.33 / 745||21.06 / 535||14.53 / 369|
|54||21.69 / 551||71.5˚||73˚||16.93 / 430||40.27 / 1023||2.09 / 53||2.83 / 72||5.20 / 132||30.55 / 776||22.24 / 565||14.88 / 378|
|56||22.44 / 570||71.5˚||73˚||16.93 / 430||41.02 / 1042||2.09 / 53||2.83 / 72||6.42 / 163||31.53 / 801||23.43 / 595||15.24 / 387|
|58||23.07 / 586||72˚||73˚||16.93 / 430||41.38 / 1051||1.97 / 50||2.77 / 70.5||7.40 / 188||32.48 / 825||24.41 / 620||15.59 / 396|
|61||23.66 / 601||72.5˚||73˚||17.2 / 435||41.97 / 1066||1.97 / 50||2.77 / 70.5||8.15 / 207||33.31 / 846||25.20 / 640||15.94 / 405|
FIT & SIZING