Jamis Explorer A2

2025 UrbanComfort Manufacturer page

Last known price: $589

Prices shown first for United States
Suspension: Rigid
Wheels: 650b
Drivetrain: 3 × 7 28–48t / 14–34t
Gear range: 416%
Weight: 13.83 kg 30.5 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Rim brake

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

10 of 19 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

6061 TIG-welded aluminum, all-new sport comfort design with upright ride position, replaceable derailleur hanger Not identified

Suspension

1 part

Fork

Hi-tensile steel unicrown, radius blades with dropout eyelets Not identified

Drivetrain

7 parts

Bottom bracket

Sealed cartridge, 68 x 110.5mm Not identified
Cassette
- Shimano Tourney TZ MF-TZ510-7 7 speeds
MF-TZ510
Chain
- KMC Z7 7 speeds
Crankset

Forged alloy, 48/38/28T, 170mm with chainguard Not identified
Front derailleur
- Shimano Tourney FD-TY510
FD-TY510
Rear derailleur
- Shimano Tourney RD-TY300 7 speeds
RD-TY300
Shifters
- Shimano ST-EF500
ST-EF500

Brakes

1 part

Brakes
- ProMax

Wheels and tires

2 parts

Rims
- Formula
Tires
- CST

Cockpit and contact points

7 parts

Grips

Kraton comfort Not identified
Handlebar

Comfort hi-rise, steel, 25.4 x 80mm rise x 15 ̊ sweep x 640mm Not identified
Headset

Internal cup, threaded, 1 1/8” Not identified
Pedals

Comfort platform with TPE non-slip insert Not identified
Saddle
- Jamis
Seatpost

Alloy micro-adjust, 350mm x 27.2mm, with alloy QR clamp Not identified
Stem
- Jamis

Sizes and geometry

7 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 17"

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size

Complete manufacturer geometry table 7 published sizes

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	557	569	578	587	594	598	618
Seat tube lengthmm	356	381	406	432	457	483	533
Head tube lengthmm	160	155	170	175	180	195	220
Head tube angle	69°	69°	69°	70°	69°	70°	70°
Seat tube angle	72°	71°	71°	71°	71°	71°	71°
Chainstay lengthmm	450	450	450	450	450	450	450
Wheelbasemm	1057	1059	1067	1066	1072	1077	1097
Bottom bracket heightmm	284	284	284	284	284	284	284
Standover heightmm	478	727	483	768	486	808	847
Fork rakemm	42	42	42	42	42	42	42

Not published by the manufacturer: Reach, Stack, Front center, Bottom bracket drop, Trail, Stack/reach ratio, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Steel
Bicycle weight: 13.83 kg

30.5 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 28
Largest chainring: 48
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 34
Lowest gear: 22.7 in
Highest gear: 94.3 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 2.1″
Travel: Front: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 650b

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 36.1 km/h

Total gear range 416%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 22.7–94.3 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2025 builds
Specification	This bicycle Jamis Explorer A2	Jamis Explorer A1
Frame
Fork material	Steel	Aluminum
Bicycle weight	13.83 kg	15.65 kg
Suspension
Suspension configuration	Rigid	Hardtail
Front travel	Not informed	80 mm
Drivetrain
Rear sprockets	7	8
Smallest sprocket	14	12
Largest sprocket	34	32
Lowest gear	22.7 in	24.1 in
Highest gear	94.3 in	110.0 in
Brakes
Brake type	Rim brake	Mechanical disc
Cockpit
Seatpost	Rigid seatpost	suspension
Other specifications
Suspension	Rigid	Hardtail
Wheel size	650b	27.5″
Fork spring	Not informed	Coil