Lowest1.14:1
Highest2.29:1
Total range200%
Estimated speed At 90 RPM
Lowest gear
Highest gear
Rear tire: 24×1.95.
Velopedia Bicycle Archive
2021 Jamis XR24
Original specifications: Shimano TY300 rear drivetrain · 24 wheels · 24.00 lbs published weight.
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At a glance
Archive #900001736- Model year
- 2021
- Category
- Kids
- Original MSRP
- $569.95
- Sizes
- 12” B
- Colors
- Gloss Black, Ninja Green, Sky Blue, Violet Powder
- Weight
- 24.00 lbs
- Geometry
- 1 manufacturer size
- In this record
- 22 specifications · archived image · original MSRP · geometry
Original buildAluminum · Shimano TY300 rear · 24
Frameset
| Frame Construction | 6061 aluminum main tubes, zero-stack head tube, over- sized stays, replaceable derailleur hanger |
|---|---|
| Frame Material | Aluminum |
| Fork | Unicrown, hi-tensile steel, 28.6 steerer |
| Fork Material | Steel |
Drivetrain
| Component Group | Shimano TY300 rear |
|---|---|
| Shifters | Shimano RevoShift 35, 7-speed |
| Rear Derailleur | Shimano TY300 rear |
| Crankset | Forged alloy crank, 152mm, 32T chainring and protective outer rock-ring |
| Bottom Bracket | Sealed cartridge |
| Cassette | Shimano TZ500 freewheel, 14-28, 7-speed |
| Chain | KMC Z51 |
| Pedals | MTB platform, hi-impact resin |
Brakes
| Brakes | Alloy linear pull type with Tektro youth specific levers |
|---|
Cockpit & Contact Points
| Headset | Zero-stack internal cup threadless, 15mm cone spacer |
|---|---|
| Handlebar | MTB alloy riser, 6 ̊ sweep x 20mm rise x 580mm wide |
| Stem | MTB alloy threadless, 15 ̊ rise x 60mm extension |
| Saddle | Jamis ATB Youth |
| Seatpost | Alloy micro-adjust, 27.2 x 300mm, with 31.8mm alloy clamp |
Wheels & Tires
| Wheels | Alloy 36H black anodized rims with brushed brake tracks, alloy MTB hubs with nutted axles, 14G black electroplated spokes |
|---|---|
| Front Tire | CST MTB Sport, 24 x 1.95” |
| Rear Tire | CST MTB Sport, 24 x 1.95” |
| Wheel Size | 24 |
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Geometry
Frame measurements by size.
Reference drawing
Size
Measurement
Measurement
—
Select an available measurement to locate it on the frame.
All geometry measurements1 size · 9 measurements
| Measurement | 12” B |
|---|---|
| Effective top tube | 523 mm |
| Head tube | 100 mm |
| Head-tube angle | 70° |
| Seat-tube angle | 72° |
| Chainstay / rear center | 410 mm |
| Wheelbase | 981 mm |
| Bottom-bracket height | 261 mm |
| Standover height | 561 mm |
| Fork offset / rake | 45 mm |
Dimensions as recorded.
Gearing
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
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 your current gearingChanged tires or gears? Calculate your setup.
Your changes apply to this calculation. The archived build stays unchanged.
Gearing results
| Measure | Original | Your setup |
|---|---|---|
| Lowest ratio | — | — |
| Highest ratio | — | — |
| Total range | — | — |
| Lowest-gear speed | — | — |
| Highest-gear speed | — | — |
Speeds are estimates. These calculations do not establish component compatibility or available tire clearance.
Parts & serviceability
Find replacement parts
Alloy micro-adjust
27.2 x 300mm, with 31.8mm alloy clamp
Retailer offers
Race Face Ride XC Seatpost Black, 27.2x375mm
Replacement option
Shimano TZ500 freewheel
14-28, 7-speed
More parts (2)Fewer parts
CST MTB Sport
24 x 1.95”
Alloy linear pull type with Tektro youth specific levers
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 Sport, 24 x 1.95”
- Rear tire
- CST MTB Sport, 24 x 1.95”
- Drivetrain
- 7-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
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: 6061 aluminum main tubes, zero-stack head tube, over- sized stays, replaceable derailleur hanger · Fork: Unicrown, hi-tensile steel, 28.6 steerer · Steel
Drivetrain
Check drivetrain wear →Archived: Group: Shimano TY300 rear · Shifters: Shimano RevoShift 35, 7-speed · Rear derailleur: Shimano TY300 rear · Crankset: Forged alloy crank, 152mm, 32T chainring and protective outer rock-ring · Bottom bracket: Sealed cartridge · Cassette: Shimano TZ500 freewheel, 14-28, 7-speed · Chain: KMC Z51
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: 24 · Wheels: Alloy 36H black anodized rims with brushed brake tracks, alloy MTB hubs with nutted axles, 14G black electroplated spokes · Front tire: CST MTB Sport, 24 x 1.95” · Rear tire: CST MTB Sport, 24 x 1.95”
Controls and contact points
Archived: Headset: Zero-stack internal cup threadless, 15mm cone spacer · Handlebar: MTB alloy riser, 6 ̊ sweep x 20mm rise x 580mm wide · Stem: MTB alloy threadless, 15 ̊ rise x 60mm extension · Seatpost: Alloy micro-adjust, 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.