Jamis X24 Disc

2025 YouthMountain youth Manufacturer page

Last known price: $569

Prices shown first for United States
Fork travel: 50 mm
Wheels: 24″
Drivetrain: 1 × 7 32t / 14–34t
Gear range: 243%
Weight: 13.04 kg 28.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Mechanical disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

7 of 18 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 aluminum main tubes, zero-stack head tube, over- sized stays, replaceable derailleur hanger Not identified

Suspension

1 part

Fork

XC50 24”, coil spring, 25.4mm stanchions, aluminum lowers, 50mm travel Not identified

Drivetrain

6 parts

Bottom bracket

Sealed cartridge Not identified
Cassette
- SunRace
Chain
- KMC
Crankset

Forged alloy crank, 152mm, 32T chainring and protective outer rock-ring Not identified
Rear derailleur
- Shimano Tourney RD-TY300 7 speeds
RD-TY300
Shifters
- Shimano

Brakes

1 part

Brakes
- Tektro MD-M280
MD-M280

Wheels and tires

2 parts

Rims

Alloy 36H black anodized disc rims, alloy 6-bolt disc hubs with QR, 14G black electroplated spokes Not identified
Tires
- CST

Cockpit and contact points

7 parts

Grips

Kraton for Grip Shift Not identified
Handlebar

MTB alloy riser, 6 ̊ sweep x 20mm rise x 580mm wide Not identified
Headset

Zero-stack internal cup threadless, 15mm cone spacer Not identified
Pedals

MTB platform, hi-impact resin Not identified
Saddle
- Jamis
Seatpost

Alloy micro-adjust, 27.2 x 300mm, with 31.8mm alloy clamp Not identified
Stem

MTB alloy threadless, 15 ̊ rise x 60mm extension Not identified

Sizes and geometry

1 size Open in the geometry plotter

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

Size 12"

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 1 published size

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	518
Seat tube lengthmm	305
Head tube lengthmm	100
Head tube angle	69°
Seat tube angle	72°
Chainstay lengthmm	410
Wheelbasemm	980
Bottom bracket heightmm	270
Standover heightmm	579
Fork rakemm	40

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: Aluminum
Bicycle weight: 13.04 kg

28.7 lb

Suspension

Suspension configuration: Hardtail
Front travel: 50 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 7
Smallest sprocket: 14
Largest sprocket: 34
Lowest gear: 22.6 in
Highest gear: 54.9 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Mechanical disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Coil
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 24″

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

22.6 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Highest gear

54.9 gear inches

This value is within the central range for this class.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 257 bicycles with this information
Coverage: 70.0% of the class

Shifting

Mechanical

10 of 367 bicycles with this information use electronic shifting.

Cohort: Youth / Mountain youth Model year: 2025
Sample: 367 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 8.7 km/h
Highest gear: 21.0 km/h

Total gear range 243%

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: 22.6–54.9 gear inches
Class reference (p10–p90): 14.0–80.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Youth / Mountain youth Model year: 2025
Lowest gear: 257 bicycles with this information, 70.0% of the class
Highest gear: 257 bicycles with this information, 70.0% of the class