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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.
Back when we started building our first bikes in the late 70’s, steel was the only way to go. Fast forward 35 years and steel is no longer the industry’s dominant frame material, but we still love to work with it and ride it. Why? Hit a baseball with a wooden bat then with an aluminum bat and you’ll know why. You want your frame material to soak up streets and trails, not beat you with them. Not to mention the stuff is durable, can handle nicks and dents and gouges without cause for alarm, and is easily repairable. We like the look of those straight, skinny tubes, too.
Reynolds pioneered the techniques of making butted tubing around the turn of the century, and their 531 manganese-molybdenum tubing was the standard of excellence for many decades. In 1995, Reynolds introduced 853 (and a non-heat-treated version, 631, two years later); the world’s first commercial air-hardening steel for bicycle frames and Jamis was one of the first brands to use it in 1997. Welding steel often results in a 40% strength loss, requiring thick tubing walls as an offset. Not so with 853 and 631. This material actually gets stronger at the weld zones, allowing Reynolds to draw the tubing thinner for a lighter, stronger frame.
Though the high performance and buttery-smooth ride qualities of Reynolds 853 and 631 usually grab all the headlines, our frame building is equally over the top. All tubing is cleaned before being cut, jigged and welded. All tubing cuts are de-burred and buffed before welding. We use heat sinks in the head and seat tubes to control distortion. And our low-angle welding tracks form precisely arced, low-profile TIG beads while dispersing welding heat more widely, yielding a frame that requires less post-welding alignment. Add investment cast or water-jet cut dropouts for great looks and extra strength and you’ve got a labor of love that rides like a dream.
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.
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.
Enhanced Compliance Offset (ECO) fork blades are swept forward several millimeters to provide extra vertical compliance for a more comfortable and controlled ride without any compromise in lateral stiffness. This is possible in part due to the ECO’s reinforcing rib on the inside of the fork legs. The integration of a 12mm thru-axle into our fork maintains all of the characteristics of our ECO design while adding the thru-axle benefits of increased front-end stiffness and further reduced weight. Win-win.
Securing the rear wheel to the frame by threading it into the rear dropouts is not only safer, it’s stiffer. Increasing the rear axle diameter from 10mm to 12mm provides a stable platform for the disc braking forces and allows us to tune the rear seat stays for more compliance/comfort. You will appreciate this on your long days. The rear wheel tracks directly in line with the frame, for more precise handling, so you can go faster with more confidence. The 142mm hub dropouts provide a self-centering feature for the rear wheel for faster, easier installation.
With endurance geometry designed to go anywhere the only choice was disc brakes. Now the Renegade Elite, Expert and Exploit all come 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.
UPGRADES/CHANGES FROM 2016
• Redesigned flat mount frame, 12x142 thru-axle w/ Jamis MTS
• ECO flat mount disc fork, 12mm thru-axle w/Jamis MTS
• WTB i23 STS disc rims with TCS (UST Tubeless Compliant System)
• Clement X Plor MSO 700 x 36c tires
• Shimano BR-RS505 hydraulic disc brakes
REASONS TO UPGRADE FROM RENEGADE EXPAT
• Reynolds 631 double-butted chromoly frame
• Shimano 105 group including crankset
• WTB i23 STS disc rims with TCS (UST Tubeless Compliant System)
• Formula sealed bearing Centerlock hubs
• Shimano BR-RS505 hydraulic disc brakes
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 23-24mm wider rims effectively gives you a constant and wide tire surface yielding better handling, stability and confidence with plenty of surface grip for control.
Just in case you want to continue to push the boundaries, we added cable routing capability for a 27.2mm dropper post. Carbon-made Elite and Expert models have routing for an internal post while the Exploit is fitted for external.
|Frame||Jamis SSD frame geometry, Reynolds 631 double-butted SST chromoly main tubes, 44mm head tube for tapered fork, threaded BB shell, 12x142 Jamis MTS (Modular Thru-axle System), flat mount disc brake mounts, top tube mounted full cable housing, dropper post cable guides, 3 waterbottle mounts, rack and fender eyelets, clearance for 40c tires|
|Fork||Jamis Adventure ECO monocoque carbon composite, 12mm Jamis MTS (Modular Thru-axle System) with stainless interface and carbon dropouts, tapered steerer with 1.5” hollow formed crown, flat mount disc brakes with internal cable routing, exposed fender, lowrider and water bottle eyelets|
|Headset||FSA Orbit ITA B Internal/External, 1.5 - 1 1/8”|
|Wheels||WTB i23 STS disc rims with TCS (UST Tubeless Compliant System), 32H, Formula alloy Centerlock sealed bearing hubs with front 12mm/rear 12x142 thru-axle and 14g black stainless steel spokes|
|Tires||Clement X Plor MSO, 700 x 36c, 30TPI with protection belt|
|Derailleurs||Shimano 105 RD-5800 GS rear and 105 FD-5800 with 28.6mm alloy clamp|
|Shiftlevers||Shimano RS505 Dual Control STI, 22-speed|
|Cassette||Shimano 105 11-speed, 11-32T|
|Crankset||Shimano 105 FC-5800 compact double, 50/34T, 165mm (48), 170mm (51), 172.5mm (54/56), 175mm (58/61)|
|BB Set||Shimano SM-BBR60|
|Brakeset||Shimano BR-RS505 hydraulic disc brakes with resin pads, Centerlock Ice Tech 160mm rotors and Shimano ST-RS505 Dual Control STI 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||Ritchey 4-Axis 3D forged 6061 alloy, 6˚ x 80mm (48/51), 90mm (54/56), 110mm (58/61)|
|Tape||Fizik Microtex Superlight Soft Touch with gel inserts|
|Seat Post||Jamis carbon fiber micro-adjust, 27.2 x 330mm with cromo seat pin|
|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||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|
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