HELIX A2
Jamis
Crosscountry
HELIX A2 is an alloy cross-country mountain bike (2024), by Jamis, from the Helix lineup. This model is best for a wide range of riders thanks to its fit flexibility, with a setup that gives you 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. The trade-off to keep in mind is a firmer ride feel than comfort-first options. This summary is a starting point—compare this bike on MatchBikes.com with similar bikes.
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
5.2
Low
Climbing Efficiency
8.4
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
2024
Price
$729
Weight
14.51 kg
Category
Mountain
Sub Category
Crosscountry
Groupset
Tourney, Altus
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 | 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" |




























































