MSRP | $499 | $599 |
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Where to Buy | — $1 At | — $1 At |
Category | Crosscountry | Crosscountry |
Weight | 32.0 lbs | 31.2 lbs |
Aluminum | Aluminum | |
Fork | Suntour XCE | Suntour XCT |
Wheels | Aluminum | Aluminum |
27.5″ | 27.5″ | |
Brakes | Mechanical Disc | Hydraulic Disc |
Groupset | Tourney | Tourney, Altus |
Drivetrain | 3 × 7 | 3 × 8 |
Suspension | Hardtail | Hardtail |
Front Travel | 100mm | 100mm |
Brand Site | ||
Summary | The Jamis HELIX A2 and Jamis HELIX A1 are both 27.5″ aluminum frame hardtail crosscountry bikes. The HELIX A2 has better components, while the HELIX A1 has a better fork and higher gearing. |
Based on frame geometry and build specs.
Frame | 6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger | 6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger |
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Fork | SR Suntour XCE 28 DS 27.5”, coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 100mm travel Travel: 100mm Spring Type: Coil | SR Suntour XCT 30 HLO 27.5”, coil spring, hydraulic speed lock out adjust, external preload adjustor, 30mm stanchions, aluminum lowers, 100mm travel Travel: 100mm Spring Type: Coil |
Bottom Bracket | Sealed cartridge | Sealed cartridge |
Headset | Zero-stack internal cup threadless, 15mm cone spacer | Zero-stack internal cup threadless, 15mm cone spacer |
Stem | Jamis XC alloy threadless, 31.8 x 10˚ rise x 70mm (15/17”), 90mm (19”/21”) | Jamis XC alloy threadless, 31.8 x 10˚ rise x 70mm (15/17”), 90mm (19”/21”) |
Handlebar | Jamis XC alloy riser, 31.8 x 20mm rise x 720mm | Jamis XC alloy riser, 31.8 x 20mm rise x 720mm |
Saddle | Jamis ATB Sport, SL cover, protective front and rear guards | Jamis ATB Sport, SL cover, protective front and rear guards |
Seatpost | Jamis alloy micro-adjust, 31.6 x 350mm (15”) 400mm (17”-21”) | Jamis alloy micro-adjust, 31.6 x 350mm (15”) 400mm (17”-21”) |
Pedals | MTB platform, hi-impact resin | MTB platform, hi-impact resin |
Grips | Kraton | Kraton |
Rear Derailleur | Shimano TY300 | Shimano TX800 |
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Front Derailleur | TY500 | TY700 |
Crank | Forged alloy, 42/34/24T | Shimano TY-301, 42/34/24T |
Shifters | Shimano EF41, 3x7-speed | Shimano M310, 3x8-speed |
Cassette | Shimano TZ500, 7-speed, 14-34T | Shimano HG200, 8-speed, 12-32T |
Chain | KMC Z51, 7-speed | KMC Z7, 8-speed |
Brakes | Tektro M280 mechanical disc, 160mm rotors and Shimano levers | Tektro M275 hydraulic disc, 160mm rotors |
Rims | Alex TD26 27.5” rims, 32H, alloy 6-bolt disc hubs, 14G nickel-plated spokes | Alex TD26 27.5” rims, 32H, alloy 6-bolt disc hubs, 14G nickel-plated spokes |
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Tires | CST Patrol, 27.5 x 2.25” | CST Patrol, 27.5 x 2.25” |