2019 Jamis

EXPLORER STEP-THRU

A 650b aluminum frame comfort bike with mid-range components and rim brakes.
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Manufacturer Price

$429
Weight30.5 lbs  
FrameAluminum
SuspensionRigid
ForkSteel
Wheels650b Aluminum
Drivetrain3 × 7
GroupsetTourney
BrakesRim
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Insights
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)

28 mph

EXPLORER STEP-THRU

29 mph

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Highest gear

(descending)

Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

6061 TIG-welded aluminum, all-new sport comfort design with upright ride position, replaceable derailleur hanger, center-mount kickstand bracket

Fork

Hi-tensile steel unicrown, radius blades with dropout eyelets

Bottom Bracket

Sealed cartridge, 68 x 110.5mm

Headset

Internal cup, threaded, 1 1/8”

Stem

Jamis alloy, angle-adjustable, 90mm ext x 150mm quill (14–18") or 110mm ext x 180mm quill (19–21”)

Handlebar

Hi-rise comfort, 15D sweep x 80mm rise x 640mm wide

Saddle

Jamis Comfort with extra thick padding, synthetic suede top, burnished side panels and bumper springs

Seatpost

Alloy micro-adjust, 350mm x 27.2mm, with alloy QR clamp

TypeRigid

Pedals

Comfort platform with TPE non-slip insert

Grips

Kraton comfort

Groupset
Rear Derailleur

Shimano TY300

Front Derailleur

TY510 top swing/dual pull

Crank

Shimano FC-TY501, 48/38/28T, 170mm with chainguard

Shifters

Shimano Revoshift, SL-RS35, 21-speed

Cassette

Shimano freewheel 7-speed, 14-34

Chain

KMC Z7

Brakes

ProMax alloy direct pull brakes with Tektro 530-RS levers

TypeRim

Wheels
Rims

Alloy 36H rims, Formula alloy hubs, QR front and rear, 14g stainless steel spokes

Tires

CST - 1918, 27.5 x 2.1

Rider Notes
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Last updated October 17
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