2020 Jamis

HELIX A2

A 27.5″ aluminum frame hardtail crosscountry bike with mid-range components and mechanical disc brakes.
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MSRP$499
Weight32.0 lbs  
FrameAluminum
SuspensionHardtail, 100mm
ForkSuntour XCE
Wheels27.5″ Aluminum
Drivetrain3 × 7
GroupsetTourney
BrakesMechanical Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
HELIX A2
Other Crosscountry bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

25 mph

HELIX A2

27 mph

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Highest gear

(descending)

Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

6061 aluminum main tubes, over-sized seat tube, zero-stack head tube, over-sized stays, replaceable derailleur hanger

Fork

SR Suntour XCE 28 DS 27.5”, coil spring, external preload adjustor, 28mm stanchions, aluminum lowers, 100mm travel

Travel100mm

Spring TypeCoil

Bottom Bracket

Sealed cartridge

Headset

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”)

Handlebar

Jamis XC alloy riser, 31.8 x 20mm rise x 720mm

Saddle

Jamis ATB Sport, SL cover, protective front and rear guards

Seatpost

Jamis alloy micro-adjust, 31.6 x 350mm (15”) 400mm (17”-21”)

TypeRigid

Pedals

MTB platform, hi-impact resin

Grips

Kraton

Groupset
Rear Derailleur

Shimano TY300

Front Derailleur

TY500

Crank

Forged alloy, 42/34/24T

Shifters

Shimano EF41, 3x7-speed

Cassette

Shimano TZ500, 7-speed, 14-34T

Chain

KMC Z51, 7-speed

Brakes

Tektro M280 mechanical disc, 160mm rotors and Shimano levers

TypeMechanical Disc

Wheels
Rims

Alex TD26 27.5” rims, 32H, alloy 6-bolt disc hubs, 14G nickel-plated spokes

Tires

CST Patrol, 27.5 x 2.25”

Rider Notes
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Last updated April 27
Not listed for 1,426 days