Jamis Helix 27.5″ Sport Mountain Bike 2017

$659.99

Categories: ,

Description

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.

Cosmo Blue

Gloss Black

TAKING IT TO THE LIMIT

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.

STEEL KEEPING IT REAL

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.

699

quest SPORT

SIZE Specific FRAME DESIGN

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.

Steel Specific Geometry

For a greater range of handlebar and rider positions, we’ve fitted the Quest series frames with taller head tubes. Coupled with a slightly longer wheelbase and relaxed head tube angle, the result is more confident steering & handling and a more comfortable position for longer rides whether competitive or recreational.

Air-Hardened Steel

Taking advantage of the high tensile strength of steel without having to worry about strength degradation due to welding is incredibly liberating. Welding steel often results in a 40% strength loss, requiring thick tubing walls as an offset. Not so with the air-hardened Reynolds 631 steel alloys used on our Quest Elite frames. This material actually gets stronger at the weld zones, allowing Reynolds to draw the tubing thinner for a lighter, stronger frame.

Reinforced Head Tube

Reinforcing rings are brazed on the head tube to prevent the headset and fork movement from deforming the thin-walled chrome-moly head tube.

Gender Specific Geometry

Our Quest 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.

Classic Lost Wax Casting

Lost wax casting (aka investment casting) is an expensive process used mainly for the complicated shapes of high quality lugs and fork crowns. The dropouts of the Quest Elite are lost wax molded, as are the classically shaped seat collars of all our steel road bikes.

Full Carbon Monocoque Forks

Manufactured by the same team that produces our Xenith Endura frames, the carbon forks on our Quest series models are formed as true monocoque forks, in one continuous unit (steerer/crown/blades) for optimal strength and performance.

UPGRADES / CHANGES FROM 2016

Redesinged SSD frame geometry

Alex AT 470 rims with TCS (Tubeless Compatible System)

Shimano HG41 8-speed, 11-32T cassette

Frame 4130 double-butted chromoly main tubes with SSD frame geometry and SST tubing diameters, sloping top tube frame design, double-tapered cromo stays, forged dropouts and fender/rack eyelets
Fork Full 4130 chromoly lugged crown, radius blades, forged dropouts with fender eyelets
Headset Ritchey LB threadless, 1 1/8”
Wheels Alex AT 470 rim with TCS (Tubeless Compatible System) with CNC sidewalls, 28/32H, Formula alloy hubs with QR and 14g stainless steel spokes
Tires Vittoria Zaffiro, 700 x 25c
Derailleurs Shimano Claris RD-2400 GS rear and Shimano Claris FD-2403 front with 28.6mm alloy clamp
Shift levers Shimano Claris ST-2400 Dual Control STI, 24-Speed
Chain KMC Z8
Cassette Shimano HG41 8-speed, 11-32T
Crankset Shimano Claris FC-2403, 52/42/30T, 170mm (48/5154), 175mm (56/58/61)
BB Set FSA sealed cartridge, 68 x 116mm
Pedals Touring platform style, full alloy with toe clips
Brakeset Tektro R317 long reach dual-pivot calipers with adjustable pads Shimano Claris ST-2400 STI levers
Handlebar Jamis Ergo, 6061 aluminum, 31.8 x 380mm (48), 400mm (51/54), 420mm (56/58/61)
Stem Jamis Road, 3D forged 6061 alloy, 7º x 90mm (48/51), 100mm (54/56), 110mm (58/61)
Grips Jamis suede tape
Seat Post Jamis alloy micro-adjust, 26.6 x 300mm with cromo seat pin
Saddle Jamis Touring Sport with pressure relief cut-out
Sizes 48, 51, 54, 56, 58, 61cm
Color Gloss Black or Cosmo Blue
Weight 25.00 lbs
SIZE TOP EFFECTIVE HEAD ANGLE SEAT ANGLE CHAIN STAY WHEEL BASE FORK RAKE BB DROP HEAD TUBE STANDOVER STACK REACH
48 20.24 / 514 71˚ 75˚ 16.34 / 415 39.09 / 993 1.97 / 50 2.79 / 71 5.24 / 133 29.01 / 737 21.53 / 547 14.44 / 367
51 21.02 / 534 72˚ 74˚ 16.34 / 415 39.13 / 994 1.97 / 50 2.74 / 69.5 5.94 / 151 30.24 / 768 22.30 / 566 14.61 / 371
54 21.85 / 555 72.5˚ 73˚ 16.54 / 420 39.33 / 999 1.69 / 43 2.68 / 68 6.61 / 168 30.98 / 787 23.07 / 586 14.79 / 376
56 22.24 / 565 73˚ 73˚ 16.54 / 420 39.53 / 1004 1.69 / 43 2.68 / 68 7.32 / 186 31.77 / 807 23.81 / 605 14.96 / 380
58 22.60 / 574 73˚ 73˚ 16.73 / 425 40.08 / 1018 1.69 / 43 2.62 / 66.5 8.15 / 207 32.48 / 825 24.55 / 624 15.09 / 383
61 22.99 / 584 73˚ 73˚ 16.73 / 425 40.47 / 1028 1.69 / 43 2.62 / 66.5 8.94 / 227 33.23 / 844 25.39 / 645 15.26 / 388

OVERVIEW

SPECIFICATIONS

FIT & SIZING

VIEW LAST YEAR’S MODEL >

BIKES

MOUNTAIN

ROAD

ADVENTURE

STREET

RECREATIONAL

YOUTH

COMPANY

ABOUT US

CAREERS

JAMIS TEST RIDE EXPERIENCE

COMMUNITY

SUPPORT

JAMIS AUTHORIZED DEALERS

FACEBOOK

YOUTUBE

TWITTER

INSTAGRAM

CONTACT US

BECOME A JAMIS RETAILER

REGISTER YOUR BIKE

JAMIS CATALOG ARCHIVE

FREQUENTLY ASKED QUESTIONS

Safety Notices & Recalls

Reviews

There are no reviews yet.

Be the first to review “Jamis Helix 27.5″ Sport Mountain Bike 2017”

Your email address will not be published. Required fields are marked *