2017 Jamis Helix
2017 Jamis Helix
Lightweight and strong 6061 series aluminum tubing, featuring over-sized & tapered tubing for increased frame stiffness.
The aluminum frame of the Trail X and Helix is beefed up to include a larger 34.9mm seat tube, which allows us to spec an over-sized 31.6mm seat post. The larger diameter post flexes less, providing a firmer pedaling platform.
TOP TUBE CABLE ROUTING
Running the cables up under the top tube keeps cables and housing out of the muck for more precise and reliable shifting performance.
ZERO STACK INTERNAL HEADSET
A Zero Stack internal headset places both the cups and bearings inside the head tube instead of outside. This reduces the total stack height (including the head tube), which is beneficial on larger wheeled bikes. The larger diameter head tube also provides a larger weld interface at the critical head/top/down tube junction.
DUAL WATER BOTTLE MOUNTS
Most of our Trail X sizes offer two water bottle mounts located inside the main frame. This provides excellent hydration capacity in an easily accessible position.
REPLACEABLE DERAILLEUR HANGER
Because it’s much easier and much less expensive to replace a derailleur hanger than it is to repair or replace a frame, every Trail X and Helix frame offers a replaceable derailleur hanger designed to yield in a crash before the frame does.
FULL SHIMANO SHIFTING SYSTEM
Fully integrated shifting systems offer the most precise and reliable performance. That’s why our Trail X and Helix models all offer Shimano shifters, Shimano front and rear derailleurs and Shimano cassettes or freewheels.
ALEX TD26 DISC-SPECIFIC RIMS
Disc hubs twist during braking. This twisting increases “pull” load on the nipples in the spoke bed. The Alex TD26 spoke bed on the rims specified on Expert, Comp and Sport is cleverly reinforced to resist disc brake torque and prevent spokes & nipples from shearing.
Frame: 6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger
Fork: RST Gila 27.5", coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 100mm travel
Headset: Zero-stack internal cup threadless, 15mm cone spacer
Wheels: Alex ACE-17 double-wall alloy rims, 36H, heavy-duty ATB hubs with QR, stainless spokes
Tires: CST Patrol, 27.5 x 2.25”
Derailleurs: Shimano TX-35 rear and TX50 front
Shift levers: Shimano EF41, 3x7-speed
Chain: KMC Z51, 7-speed
Cassette: Shimano TZ31, 7-speed, 14-34T
Crankset: Forged alloy crank, 42/34/24T, 170mm (14"/16") 175mm (18")
BB Set: Sealed cartridge
Pedals: ATB platform, hi-impact resin
Brakeset: Alloy linear pull type with Shimano levers
Handlebar: Jamis XC riser, 25.4 x 20mm rise x 620mm
Stem: Jamis XC alloy threadless, 25.4 x 15º rise x 75mm (14”), 75mm (16"), 90mm (18")
Seat Post: Jamis alloy micro-adjust, 31.6 x 350mm (14") 400mm (16"/18")
Saddle: Jamis ATB Sport Women's, SL cover, protective front and rear guards