HELIX A2
Jamis
Crosscountry
HELIX A2 is an alloy cross-country mountain bike (2023), from Jamis, in the Helix series. This setup will suit a wide range of riders thanks to its fit flexibility, with a balanced riding position, while being best for smoother trails and efficient rolling. Standout strengths from the metrics include strong value-for-money versus many similar bikes, strong climbing friendliness for sustained uphill riding, and good fit flexibility for dialing in rider position. Relative to category specialists, the trade-off is a firmer ride feel than comfort-first options. Compare this bike on MatchBikes.com to similar cross-country models.
7.2
Rating

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Score Summary
Performance
6.6
Value
9.7
Fit
6.4
Performance
Built for speed and efficiency
Speed
5.3
Low
Climbing Efficiency
8.3
Climber
Suspension
5.0
Confident trail control
Fit
Dialed-in Fit & Comfort
Riding Position
6.0
Balanced
Fit Flexibility
7.0
Adjustable
Ride Comfort
6.2
Race-Stiff
Value
Value for Money
9.7
Exceptional Value
Surface Range
Flow TrailsSpecifications
General
Brand
Jamis
Model
HELIX A2
Year
2023
Price
$729
Weight
14.51 kg
Category
Mountain
Sub Category
Crosscountry
Groupset
Tourney, Altus
Wheels
27.5"
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
Suspension Type
Hardtail
Drivetrain
Shift Levers
Shimano EF505, 2×8-speed
Rear Derailleur
Shimano Tourney
Front Derailleur
Altus
Cassette
Shimano HG31, 8-speed, 11-32T
Crank
Forged Alloy, 36/22T
Bottom Bracket
Sealed cartridge
Chain
KMC Z8.3, 8-speed
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
Brake Type
Hydraulic Disc
Brake Description
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
Seat
Saddle
Jamis ATB Sport Women’s
Seatpost
Jamis alloy micro-adjust, 31.6 x 350mm (14”) 400mm (16”/18”)
Geometry
| Measurement | 14" | 16" | 18" |
|---|---|---|---|
| Bottom Bracket Height | 309 mm | 309 mm | 309 mm |
| Front Center | 598 mm | 619 mm | 639 mm |
| Top Tube Length | 547 mm | 567 mm | 587 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 | 442 mm | 442 mm | 442 mm |
| Wheelbase | 1036 mm | 1057 mm | 1077 mm |
| Bottom Bracket Drop | 46 mm | 46 mm | 46 mm |
| Standover Height | 675 mm | 711 mm | 738 mm |
| Wheels | 27" | 27" | 27" |




























































