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The benefits of a properly fitted bike have been recognized for years. It is essential for injury prevention and maximized efficiency. And it is the primary determinant in assuring the greatest comfort and enjoyment while riding.
Our first road bikes introduced in 1988, the Quest and Axis (for Jamis history buffs, this later became the Eclipse), were designed in consultation with Bill Farrell, inventor of the first bike-sizing tool, the Fit Kit. Back then, bike companies generally plotted a single geometry on all frame sizes: the blow ‘em up or shrink ‘em down solution – lazy, cheap and thankfully long ago obsolete. We learned from Bill early on how to tune our frame geometries and specify component sizing to account for the multiple variables needed for a proper fit for every frame size. We’ve been honing our fits for every bike, every year, ever since.
But fit is a two-dimensional calculation. Stack and reach. How tall, how long, for me? It’s in the third dimension – the SST dimension-- that Jamis continues to make a difference for you.
Slight changes in tube diameter have a significant impact upon performance. As diameter increases, strength and stiffness increase along the length of the tube as well. Whether in aluminum, steel or carbon fiber, we vary the cross-section and sometimes even wall thicknesses to fine-tune the performance and comfort characteristics of each frame size.
SST -- Size Specific Tubing-- optimizes ride quality and assures the lightest possible weight for each frame size. By varying the diameters of the tubing in the main frames of each of our frame sizes (and sometimes even in the seatstays) by 10 – 20%, we can produce a bike that not only fits like a glove and handles precisely, but accelerates and climbs explosively and offers justright compliance for every rider, every frame size.
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.
We include front and rear brakes in our specification. The calipers are a “long-reach” type allowing for greater tire width choices and fender installation.
Whether you prefer to ride fixed or free, we’ve got you covered with a Flip-Flop rear hub and fixed cogs already installed.
There is simply no better material better suited for the rigors of urban riding than steel. Unlike aluminum, steel naturally damps or absorbs the shocks and vibrations of city streets. Aluminum simply transmits it, like a tuning fork, which is why aluminum frames are often criticized for their “harsh” riding qualities. Besides, on a fixie, where vintage reigns, skinny steel frame tubes are just right.
The Beatnik’s short length flat bar and threadless alloy stem can be flipped to a 10-degree positive position depending on rider preference.
Our SST (size-specific tubing) engineering protocol employs smaller-diameter frame sections for smaller frames and larger ones for bigger frames, for more consistent ride quality across all frame sizes.
|Frame||Hi-Ten tubing with SST tubing diameters, tapered rear stays, rear entry dropouts with fender mount eyelets|
|Fork||Unicrown straight blade with fender mount eyelets|
|Headset||Threadless, 1 1/8”|
|Wheels||Alloy rims with GSW sidewall, 32H, alloy track hubs with flip/flop rear and 14g stainless steel spokes|
|Tires||Urban, 700 x 28c|
|Cassette||Formula 16T Fixed and 16T Freewheel|
|Crankset||Forged alloy crank, single replacable 46T chainring, 170mm|
|BB Set||Sealed cartridge BB|
|Pedals||Touring platform, full alloy body|
|Brakeset||Long reach alloy calipers with shorty brake levers|
|Handlebar||Rise bar, aluminum, 25.4 barbore, 640mm wide, 100mm rise, 10° sweep|
|Stem||Jamis Road, 3D forged 6061 alloy, 35º x 80mm (47/50), 100mm (53/55), 120mm (57/59/62)|
|Tape||BMX Type Grip|
|Seat Post||Jamis alloy micro-adjust, 25.6 x 350mm with alloy clamp|
|Saddle||Jamis Vintage with perforated cover and carbon steel rails|
|Sizes||48, 51, 54, 56, 58, 61cm|
|Color||Gloss Black or Cosmo Blue|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||FORK RAKE||BB DROP||HEAD TUBE||STANDOVER||STACK||REACH|
|48||20.31 / 516||71.5˚||75.5˚||15.94 / 405||38.62 / 981||1.77 / 45||2.56 / 65||3.74 / 95||29.84 / 758||20.59 / 523||15.04 / 382|
|51||20.79 / 528||72˚||74.5˚||15.94 / 405||38.54 / 979||1.77 / 45||2.56 / 65||4.13 / 105||30.59 / 777||21.02 / 534||15.04 / 382|
|54||21.73 / 552||72.5˚||73.5˚||15.94 / 405||38.70 / 983||1.57 / 40||2.56 / 65||4.72 / 120||31.46 / 799||21.73 / 552||15.35 / 390|
|56||22.36 / 568||73.5˚||73˚||15.94 / 405||38.78 / 985||1.57 / 40||2.56 / 65||5.31 / 135||32.20 / 818||22.40 / 569||15.59 / 396|
|58||22.75 / 578||73.5˚||73˚||15.94 / 405||39.17 / 995||1.57 / 40||2.56 / 65||6.10 / 155||32.95 / 837||23.15 / 588||15.75 / 400|
|61||23.46 / 596||74˚||72˚||15.94 / 405||39.17 / 995||1.57 / 40||2.56 / 65||7.28 / 185||34.05 / 865||24.33 / 618||15.59 / 396|
FIT & SIZING
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