Jamis Helix A1 - 2020

Jamis Helix A1
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Details

Building great recreational-level bikes that ride much like (and look a lot like) our high-end bikes is a passion at Jamis. And no bikes showcase our commitment to do just that better than these. The Helix chassis emphasizes all-day performance and the handling’s quick and sure without being overly darty. But make no mistake, if you want to throw down, they are more than able to keep up with 27.5” wheels, precise shifting drivetrains and incredibly powerful disc brakes.

Frame Materials
Lightweight and strong 6061 series aluminum tubing, featuring over-sized & tapered tubing for increased frame stiffness.

Pedaling Platform
The aluminum frame of the 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 the 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 frame offers a replaceable derailleur hanger designed to yield in a crash before the frame does.

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 all Trail X models are cleverly reinforced to resist disc brake torque and prevent spokes & nipples from shearing.

- 6061 aluminum main tube frame
- SR Suntour XCT 30 HLO 27.5” suspension fork
- Alex TD26 27.5” wheel set
- 8-speed Shimano Tourney components
- Tektro M275 hydraulic disc brakes

Specs

Frame 6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger
Fork SR Suntour XCT 30 HLO 27.5", coil spring, hydraulic speed lock out adjust, external preload adjustor, 30mm stanchions, aluminum lowers, 100mm travel
Headset Zero-stack internal cup threadless, 15mm cone spacer
Rims/Wheels Alex TD26 27.5" rims, 32H
Hubs Alloy 6-bolt disc hubs
Spokes 14G nickel-plated spokes
Tires CST Patrol, 27.5 x 2.25"
Crankset Shimano TY-301
Chainrings 42/34/24T
Bottom Bracket Sealed cartridge
Chain KMC Z7, 8-speed
Front Derailleur Shimano TY700
Rear Derailleur Shimano TX800
Cassette/Rear Cogs Shimano HG200, 8-speed, 12-32T
Shifters Shimano M310, 3x8-speed
Handlebars Jamis XC alloy riser, 31.8 x 20mm rise x 720mm
Tape/Grips Kraton
Stem Jamis XC alloy threadless, 31.8 x 10° rise x 70mm (15/17"), 90mm (19”/21")
Brakes Tektro M275 hydraulic disc, 160mm rotors
Pedals MTB platform, hi-impact resin
Saddle Jamis ATB Sport, SL cover, protective front and rear guards
Seat Post Jamis alloy micro-adjust, 31.6 x 350mm (15") 400mm (17”-21")

* Subject to change without notice.

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