Velopedia Bicycle Archive

2021 Jamis Earth Cruiser 1

Original specifications: 26 wheels · 29.25 lbs published weight · geometry for 2 published sizes.

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At a glance

Archive #900001717
Model year
2021
Category
Cruiser
Original MSRP
$549.95
Sizes
M, L
Colors
Kinetic Grey, Mash, Radiant Blue
Weight
29.25 lbs
Geometry
2 manufacturer sizes
In this record
18 specifications · 4 archived images · original MSRP · geometry
Model history 12 other years

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Identification clues

2021 archived details

Published colors
Kinetic Grey, Mash, Radiant Blue
Frame
Steel

Clues, not proof of model year. Colors vary and components may have been replaced.

Campaign
Original buildSteel · 26

Manufacturer catalog

Published sizes and colors

2 sizes · 3 colors

Manufacturer-published sizes and colors; availability and exact size/color pairings may vary by market or production run.

Published sizes

ML

Published colors

Kinetic GreyMashRadiant Blue

Frameset

Frame ConstructionClassic Cantilever design with 6061 aluminum tubing, includes kickstand and painted steel chainguard
Frame MaterialSteel
ForkHi-tensile unicrown with radiused blades

Drivetrain

CranksetForged alloy crank, 170mm, with 44T chainring
Bottom BracketSealed cartridge, 68 x 122.5mm
Cassette18T
ChainKMC Z410NP, silver
PedalsCruiser platform with grip tape

Brakes

BrakesHi-Stop coaster brake

Cockpit & Contact Points

HeadsetInternal cup, threaded, 1 1/8”
HandlebarJamis Cruise-control comfort bar
StemAlloy hi-rise, 180mm quill, 100mm extension, with removeable 2-bolt cap
SaddleEarth Cruiser Comfort with memory foam padding, synthetic suede top, burnished sides and bumper springs
SeatpostAlloy micro-adjust, 27.2 x 300mm, with 31.8mm alloy clamp and cromo seatpin

Wheels & Tires

WheelsAlex Zuma 36H black anodized alloy rims with alloy nutted front hub and Hi-Stop CB rear, 14 gauge stainless steel spokes
Front TireCST Metropolitan Palm Bay, 26” x 2.35
Rear TireCST Metropolitan Palm Bay, 26” x 2.35
Wheel Size26

Geometry

2 sizes · 9 measurements

Frame measurements by size.

All geometry measurements2 sizes · 9 measurements
MeasurementMDLG
Effective top tube626 mm666 mm
Head tube130 mm140 mm
Head-tube angle69°69°
Seat-tube angle67°67°
Chainstay / rear center475 mm475 mm
Wheelbase1107 mm1147 mm
Bottom-bracket height280 mm280 mm
Standover height776 mm820 mm
Fork offset / rake55 mm55 mm

Dimensions as recorded.

Gearing

Lower gears help on climbs. Higher gears suit higher speeds.

RPM

RPM = pedal turns per minute.

All published sizes44T · 18T
Ratio2.44:1
Estimated speed At 90 RPM Gear17.5 mph

Rear tire: 26×2.35.

How it works

Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.

Speeds are estimates from tire size and pedal cadence. Actual speeds vary.

Try other gearing

Try your current gearingChanged tires or gears? Calculate your setup.

Your changes apply to this calculation. The archived build stays unchanged.

Your gearing setup
Gears

Use up to three front tooth counts, separated by /. For one rear sprocket, enter the same count twice.

Rear tire

Apply the marking on your rear tire or edit its dimensions below. Older or fractional inch sizes need the ISO marking (e.g. 37-590).

For 32-622, width is 32 mm and rim diameter is 622 mm. Use the rear tire on mixed-wheel bikes. Leave both fields empty to compare ratios only.

Gear, dimension and cadence changes update results automatically.

Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.

Parts & serviceability

Find replacement parts

Original specifications
Seatpost · Original
Alloy micro-adjust

27.2 x 300mm, with 31.8mm alloy clamp and cromo seatpin

Retailer offers
Front tire · Original
CST Metropolitan Palm Bay

26” x 2.35

Wheels · Original
Alex Zuma 36H black anodized alloy rims with alloy nutted front hub and Hi-Stop CB rear

14 gauge stainless steel spokes

Based on the original build. Check fit and installed parts before ordering. Affiliate links may earn Velopedia a commission. As an Amazon Associate I earn from qualifying purchases.

Service essentialsQuick reference before buying parts

Archived specifications for reference. Check the fitted parts before ordering.

Front tire
CST Metropolitan Palm Bay, 26” x 2.35Check: Verify the fitted tire’s size marking and rim type.
Rear tire
CST Metropolitan Palm Bay, 26” x 2.35Check: Verify the rear size; it may differ from the front.
Seatpost diameter
27.2 mmCheck: Read the post’s diameter marking; seat-clamp size differs.
Bottom bracket / shell
Sealed cartridge, 68 x 122.5mmCheck: Verify shell type and width, crank interface, and spindle length or spacers.

Not confirmed in this record: Drivetrain. Check the fitted parts for these details.

Bike-specific inspection checklist 19 checks based on 5 archived component groups Open checklistClose checklist
0 of 19 checked Progress stays in this browser for this record.

This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.

Archived: 2021 Jamis Earth Cruiser 1 · Cruiser · Published sizes: M, L

Archived: Frame: Classic Cantilever design with 6061 aluminum tubing, includes kickstand and painted steel chainguard · Fork: Hi-tensile unicrown with radiused blades

Archived: Crankset: Forged alloy crank, 170mm, with 44T chainring · Bottom bracket: Sealed cartridge, 68 x 122.5mm · Cassette: 18T · Chain: KMC Z410NP, silver

Archived: Brakes: Hi-Stop coaster brake

Archived: Wheel size: 26 · Wheels: Alex Zuma 36H black anodized alloy rims with alloy nutted front hub and Hi-Stop CB rear, 14 gauge stainless steel spokes · Front tire: CST Metropolitan Palm Bay, 26” x 2.35 · Rear tire: CST Metropolitan Palm Bay, 26” x 2.35

Controls and contact points

Archived: Headset: Internal cup, threaded, 1 1/8” · Handlebar: Jamis Cruise-control comfort bar · Stem: Alloy hi-rise, 180mm quill, 100mm extension, with removeable 2-bolt cap · Seatpost: Alloy micro-adjust, 27.2 x 300mm, with 31.8mm alloy clamp and cromo seatpin · Saddle: Earth Cruiser Comfort with memory foam padding, synthetic suede top, burnished sides and bumper springs · Pedals: Cruiser platform with grip tape

Before and during the test ride

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Gallery4 images

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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.

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