Manufacturer's Suggested Retail Price excludes shipping costs, dealer assembly/prep, taxes or import duties.
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.
TOP FIVE THINGS YOU NEED TO KNOW
Our lightweight & durable aluminum XR.20 frame is easier to pedal than steel. With tapered & ovalized tubing to optimize frame strength and durability while offering the cool looks today's young riders appreciate.
A six-speed drivetrain is enough for any youngster to learn how to shift and master. It's also enough gearing to get around the neighborhood or park comfortably. Which is why we spec just one single chainring in front: to simplify shifting. We top it off with a double-sided chainguard to keep the chain in place and clothes & legs out of the chain's way.
There's a protective derailleur guard attached to the rear of the frame to protect the rear derailleur from knocks, keeping it in adjustment longer for greater safety & control.
A full alloy parts package -- including seat post, stem cap, crankarms, seat post clamp, brakes & rims -- reduces total bike weight and adds value.
The XR.20's XC saddle offers lots of high quality padding for comfort and control, with a narrow nose so that legs can pedal freely without chafing.
|Frame||Enduro frame design, 6061 aluminum tubes, tapered/ovalized top tube, down tube & stays|
|Fork||Unicrown, 6061 aluminum, 28.6 Cr-Mo steerer|
|Headset||Aheadset, 1 1/8”|
|Wheels||Alloy 36H black anodized rims with brushed brake tracks, alloy MTB hubs with nutted axles, 14G nickel-plated spokes|
|Tires||CST MTB, 20 x 1.95”|
|Derailleurs||Shimano TX300 rear with protective guard|
|Shiftlevers||Shimano RevoShift 35, 6-speed|
|Crankset||Forged alloy crank, 152mm, with 36T chainring and protective double-sided chainguard|
|BB Set||Cotterless type, 3B axle, 68 x 119mm (35-52-32)|
|Pedals||MTB platform, hi-impact resin|
|Brakeset||Alloy linear pull type with full alloy short reach levers|
|Handlebar||MTB alloy riser, 6˚ sweep x 20mm rise x 560mm wide|
|Stem||MTB alloy threadless, 15˚ rise x 60mm extension|
|Grips||Kraton for Grip Shift|
|Seatpost||Alloy pillar, 27.2 x 300mm, with 31.8mm alloy clamp|
|Saddle||XC MTB style|
|Colors||Charcoal, Cosmo Blue, Twilight|
|SIZE||TOP EFFECTIVE||HEAD ANGLE||SEAT ANGLE||CHAIN STAY||WHEEL BASE||FORK RAKE||BB HEIGHT||HEAD TUBE||STANDOVER|
FIT & SIZING