Jamis HELIX A2 2025
2025 Mountain
Estimate price |
729$
Weight | 14.51 kg 
Bike details
Overview
Key information split into simple groups.
Bike summary
-
Category -
Frame Aluminum -
Travel Front 100mm -
Fork Suntour XCE
-
Groupset Tourney, Altus -
Suspension Hardtail -
Drivetrain 2 × 8 -
Brakes Shimano Hydraulic Disc
Parts list
Components
Main components, grouped by system.
Bike components
Frame
Frame
6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger
Suspension Fork
SR Suntour XCE 28 DS 27.5”, coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 100mm travel
Drivetrain
Rear Derailleur
Shimano Tourney
Front Derailleur
Altus
Shift Levers
Shimano EF505, 2×8-speed
Cassette
Shimano HG31, 8-speed, 11-32T
Crank
Forged Alloy, 36/22T
Bottom Bracket
Sealed cartridge
Chain
KMC Z8.3, 8-speed
Pedals
MTB platform, hi-impact resin
Wheels
Rims
Alex TD26 27.5” double wall rims, 32H, alloy disc hubs, 14G black electroplated spokes
Tires
CST Patrol, 27.5 x 2.25”
Brakes
Brakes
Shimano MT200 hydraulic disc, Shimano RT26 160mm rotors
Cockpit
Stem
Jamis XC alloy threadless, 31.8 x 10 ? rise x 75mm (14”/16”), 90mm (18”)
Handlebar
Jamis XC alloy riser, 31.8 x 20mm rise x 680mm
Grips
Kraton
Headset
Zero-stack internal cup, 8mm cone spacer
Seat
Saddle
Jamis ATB Sport Women’s
Seatpost
Jamis alloy micro-adjust, 31.6 x 350mm (14”) 400mm (16”/18”)
Fit data
Geometry
Numbers for sizing and ride feel.
| Size | 14" | 16" | 18" |
|---|---|---|---|
| Bottom Bracket Height | 309 mm | 309 mm | 309 mm |
| Front Center | 598 mm | 619 mm | 639 mm |
| Top Tube Length | 540 mm | 560 mm | 580 mm |
| Seat Tube Angle | 72.5 ° | 72.5 ° | 72.5 ° |
| Seat Tube Length | 356 mm | 406 mm | 457 mm |
| Head Tube Angle | 70 ° | 70 ° | 70 ° |
| Head Tube Length | 105 mm | 110 mm | 120 mm |
| Chainstay Length | 435 mm | 435 mm | 435 mm |
| Wheelbase | 1029 mm | 1050 mm | 1070 mm |
| Bottom Bracket Drop | 46 mm | 46 mm | 46 mm |
| Standover Height | 668 mm | 704 mm | 731 mm |
| Wheels | 27" | 27" | 27" |