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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.
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.
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.
Our Ventura Series bikes have won Bicycling’s coveted Editor’s Choice award numerous times. Which is why we offer the Race, Comp and Sport in both male and female specific packages.
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.
We are all-in. Disc brake technology provides superior stopping and safer braking no matter the conditions. They offer increased control and better modulation as you vary from being at-speed to slowing down or stopping. They are significantly less affected by rain and wet conditions, and eliminate any rim heat build-up that can come with caliper brakes. Gone is the need to be concerned with carbon rim deformation. Whether the streets of NYC or LA, or long and winding open roads, the control and safety that comes with disc brakes will only heighten the experience that comes with a riding a Jamis.
Our Ventura Femme versions offer women’s specific frame sizing & geometry and component selection, including anatomically adjusted top tube lengths, head & seat tube angles, fork rakes & women’s specific saddles, with handlebar, stem and crank lengths all dimensioned to optimally fit women for greater comfort & efficiency.
For a greater range of handlebar and rider positions, we’ve fitted the Ventura series frames with taller head tubes. Coupled with a slightly longer wheelbase and relaxed head tube angle, this results in confident, steering/handling and a more comfortable position for longer rides whether competitive or recreational.
ECO stands for Enhanced Compliance Offset. The ECO fork blades are swept forward a few millimeters to provide vertical compliance for a more comfortable and controlled ride without any compromise to lateral stiffness, thanks to the reinforcing rib on the inside of the fork legs.
Manufactured by the same team that produces our Xenith Endura frames, the carbon forks on our Ventura Race and Comp models are formed as true monocoque forks, in one continuous unit (steerer/crown/blades) for optimal strength and performance. Our competitors often use heavier 3-piece bonded carbon/alloy forks in this price range.
By enlarging the bottom bearing of the head tube from 1 1/8” to 1.5”, not only are head tube stiffness and steering precision increased, but we have sufficient room in the crown to produce a truly hollow fork from the dropout, up through the crown and steer tube, which yields exceptional compaction quality for increased strength and reduced weight.
UPGRADES FROM VENTURA COMP
• Shimano Tiagra 4700 20-speed group
• FSA Gossamer MegaExo 50/34T crankset
• Jamis carbon fiber micro-adjust 27.2 seat post
• TRP Spyre 2-piston mechanical disc brakes
UPGRADES / CHANGES FROM PREVIOUS MODEL
• Vittoria Zaffiro, 700 x 28c
• FSA Gossamer MegaExo 50/34T crankset
• Jamis suede bar tape with gel
|Frame||Size Specific Design double-butted 6061 aluminum compact sloping top tube frame design with SSD frame geometry, SST tubing diameters and internal cable guides, 1 1.5 - 1 1/8” tapered head tube, butted seat tube for 27.2 seat post, flat mount disc brake mount, replaceable derailleur hanger and fender/rack eyelets|
|Fork||Jamis Performance ECO carbon composite with carbon steerer, 1.5” hollow formed crown, monocoque one-piece forming technology, carbon dropouts with stainless tabs, flat mount disc brake mount with internal cable routing, exposed fender eyelets|
|Headset||FSA Integrated, threadless, 1.5 - 1 1/8”|
|Wheels||Alex ATD 470 disc specific rims with TCS (Tubeless Compatible System), 32H, Formula 6-bolt alloy hubs with QR and 14g stainless steel spokes|
|Tires||Vittoria Zaffiro, 700 x 28c|
|Derailleurs||Shimano Tiagra RD-4700 GS rear and Tiagra FD-4700 front with 31.8mm alloy clamp|
|Shiftlevers||Shimano Tiagra RD-4700 Dual Control STI, 20-speed|
|Chain||KMC 10-speed X10|
|Cassette||Shimano 10-speed, 11-32T|
|Crankset||FSA Gossamer MegaExo, 50/34T, 170mm (48/51), 172.5mm (54/56), 175mm (58/61)|
|BB Set||FSA MegaExo sealed cartridge|
|Brakeset||TRP Spyre 2-piston mechanical disc brakes and Shimano Tiagra RD-4700 STI levers|
|Handlebar||Ritchey Comp Logic Curve, 6061 double-butted aluminum, 31.8 x 400mm (48/51), 420mm (54/56) 440mm (58/61)|
|Stem||Ritchey 4-Axis, 3D net forged 6061 alloy, 6˚ x 90mm (48/51), 100mm (54/56), 120mm (58/61)|
|Tape||Jamis suede tape|
|Seat Post||Jamis carbon fiber micro-adjust, 27.2 x 350mm with alloy clamp|
|Saddle||Selle Royal Seta S1 with integrated clip system|
|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||19.88 / 505||71˚||75˚||16.34 / 415||38.62 / 981||1.97 / 50||2.79 / 71||4.92 / 125||28.70 / 729||21.05 / 535||14.15 / 360|
|51||20.71 / 526||72˚||74˚||16.34 / 415||38.78 / 985||1.97 / 50||2.74 / 69.5||5.71 / 145||30.08 / 764||21.88 / 556||14.39 / 366|
|54||21.57 / 548||72.5˚||73˚||16.54 / 420||39.01 / 991||1.69 / 43||2.68 / 68||6.30 / 160||30.67 / 779||22.54 / 573||14.67 / 373|
|56||22.01 / 559||73˚||73˚||16.54 / 420||39.29 / 998||1.69 / 43||2.68 / 68||7.28 / 185||31.61 / 803||23.55 / 598||14.81 / 376|
|58||22.48 / 571||73˚||73˚||16.73 / 425||39.96 / 1015||1.69 / 43||2.62 / 66.5||8.07 / 205||32.32 / 821||24.24 / 616||15.07 / 383|
|61||22.91 / 582||73˚||73˚||16.73 / 425||40.39 / 1026||1.69 / 43||2.62 / 66.5||8.86 / 225||32.99 / 838||25.00 / 635||15.27 / 388|
FIT & SIZING
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