Velopedia Bicycle Archive

2021 Jamis XR20

Original specifications: Shimano TY300 rear with protective guard drivetrain · 20 wheels · 24.00 lbs published weight.

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At a glance

Archive #900001732
Model year
2021
Category
Kids
Original MSRP
$429.95
Sizes
11″ B
Colors
Gloss Black, Limelight, Raspberry
Weight
24.00 lbs
Geometry
1 manufacturer size
In this record
22 specifications · archived image · original MSRP · geometry
Campaign
Original buildAluminum · Shimano TY300 rear with protective guard · 20

Manufacturer catalog

Published sizes and colors

1 size · 3 colors

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

Published sizes

11″ B

Published colors

Gloss BlackLimelightRaspberry

Frameset

Frame ConstructionEnduro frame design, 6061 aluminum tubes, tapered/ ovalized top tube, down tube & stays
Frame MaterialAluminum
ForkUnicrown, hi-tensile steel, 28.6 steerer
Fork MaterialSteel

Drivetrain

Component GroupShimano TY300 rear with protective guard
ShiftersShimano RevoShift 35, 6-speed
Rear DerailleurShimano TY300 rear with protective guard
CranksetForged alloy crank, 127mm, with 36T chainring and protective double-sided chainguard
Bottom BracketSealed cartridge
Cassette6-speed, 14-28T
ChainKMC Z33
PedalsMTB platform, hi-impact resin

Brakes

BrakesAlloy linear pull type with Tektro youth specific levers

Cockpit & Contact Points

HeadsetAheadset, 1 1/8”
HandlebarMTB alloy riser, 6 ̊ sweep x 20mm rise x 560mm wide
StemMTB alloy threadless, 15 ̊ rise x 60mm extension
SaddleJamis ATB Youth
SeatpostAlloy pillar, 27.2 x 300mm, with 31.8mm alloy clamp

Wheels & Tires

WheelsAlloy 36H black anodized rims with brushed brake tracks, alloy MTB hubs with nutted axles, 14G black electroplated spokes
Front TireCST MTB, 20 X 1.95”
Rear TireCST MTB, 20 X 1.95”
Wheel Size20

Geometry

1 size · 9 measurements

Frame measurements by size.

All geometry measurements1 size · 9 measurements
Measurement11″ B
Effective top tube455 mm
Head tube90 mm
Head-tube angle70°
Seat-tube angle70°
Chainstay / rear center385 mm
Wheelbase882 mm
Bottom-bracket height240 mm
Standover height516 mm
Fork offset / rake45 mm

Dimensions as recorded.

Gearing

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

RPM

RPM = pedal turns per minute.

All published sizes36T · 14–28T · 6-speed
Lowest1.29:1 Highest2.57:1 Total range200%
Estimated speed At 90 RPM Lowest gear6.9 mph Highest gear13.7 mph

Rear tire: 20×1.95.

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 pillar

27.2 x 300mm, with 31.8mm alloy clamp

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Retailer offers
Chain · Original
KMC Z33
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Front tire · Original
CST MTB

20 x 1.95”

Replacement search: 20x1.95 bicycle tire Before ordering: Check rim type and tire clearance.
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More parts (1)Fewer parts
Brake pads · Original
Alloy linear pull type with Tektro youth specific levers
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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.

Parts and service referenceQuick reference before buying parts

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

Front tire
CST MTB, 20 x 1.95”
Rear tire
CST MTB, 20 x 1.95”
Drivetrain
6-speed
Seatpost diameter
27.2 mm
Bottom bracket / shell
Sealed cartridge
Equipment inspection checks 10 checks based on 5 archived component groups Open equipment checksClose equipment checks
0 of 10 checked Progress stays in this browser for this record.

Checks selected from the archived equipment. Confirm what is fitted today. This is not a complete safety inspection; use the full inspection guide before test riding.

Full used-bike inspection guide →

Frame and fork

Inspect the frame and fork →

Archived: Frame: Enduro frame design, 6061 aluminum tubes, tapered/ ovalized top tube, down tube & stays · Fork: Unicrown, hi-tensile steel, 28.6 steerer · Steel

Drivetrain

Check drivetrain wear →

Archived: Group: Shimano TY300 rear with protective guard · Shifters: Shimano RevoShift 35, 6-speed · Rear derailleur: Shimano TY300 rear with protective guard · Crankset: Forged alloy crank, 127mm, with 36T chainring and protective double-sided chainguard · Bottom bracket: Sealed cartridge · Cassette: 6-speed, 14-28T · Chain: KMC Z33

Brakes

Inspect the brakes →

Archived: Brakes: Alloy linear pull type with Tektro youth specific levers

Wheels and tires

Check wheels and tires →

Archived: Wheel size: 20 · Wheels: Alloy 36H black anodized rims with brushed brake tracks, alloy MTB hubs with nutted axles, 14G black electroplated spokes · Front tire: CST MTB, 20 x 1.95” · Rear tire: CST MTB, 20 x 1.95”

Controls and contact points

Archived: Headset: Aheadset, 1 1/8” · Handlebar: MTB alloy riser, 6 ̊ sweep x 20mm rise x 560mm wide · Stem: MTB alloy threadless, 15 ̊ rise x 60mm extension · Seatpost: Alloy pillar, 27.2 x 300mm, with 31.8mm alloy clamp · Saddle: Jamis ATB Youth · Pedals: MTB platform, hi-impact resin

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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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