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Marin Alcatraz JR 24" 2025 Kids Jump Bike
We've taken the Alcatraz 1 and scaled it down for smaller riders.
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Burgtec 22mm x M6 Titanium Offset Shock Hardware Kit
RRP: £19.99
Our price £4.99
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Bosch Smart System Display Interface Rear Plug
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Thule Rail 4 Hydration Hip Pack
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Details
We’ve taken the Alcatraz 1 and scaled it down for smaller riders. Built upon the same tubing as the larger models, it features a 360mm reach, 69° headtube angle, and 72° seattube angle, with 369mm chainstays.
A suspension-corrected rigid CrMo fork is designed to handle rough-and-rowdy riding, and a simple and stout single-speed drivetrain and Tektro mechanical disc brakes ensure a fun and safe ride.
Specification
| Frame | Series 3 6061 Aluminum, 24” Wheels, 135×10mm Horizontal Single Speed Dropouts, 73mm Threaded BB, ISCG 05 Tabs |
| Fork | Marin Series 2 CroMo 24”, Suspension Corrected, 100×9mm Dropouts |
| Rims | Marin Custom Extrusion, 27mm Inner, Pinned Joint |
| Rear Hub | Forged Alloy, 135×10mm, Bolt-On, Quad Sealed Bearings, Disc, 32H |
| Front Hub | Forged Alloy, Bolt On 3/8” Axle, 100mm Spacing |
| Spokes | 14g Black Stainless Steel |
| Tyres | Vee Tire, Rail 24×2.25”, LSG Compound, Wire Bead |
| Crankset | Marin Forged Alloy, Alloy 32T DM Chainring, 155mm Length |
| Bottom Bracket | External Sealed Cartridge Bearings |
| Chain | KMC HL-1 |
| Rear Sprocket | 14T Single Speed Cog |
| Front Brake | Tektro MD-M280 Mechanical Disc 160mm Rotor |
| Rear Brake | Tektro MD-M280 Mechanical Disc 160mm Rotor |
| Brake Levers | Tektro CL-330TS Alloy |
| Handlebar | Marin Riser, 6061 Double Butted Aluminum, 31.8mm at center bulge, 38mm Rise, 700mm Width, 4º Up, 9º Back |
| Stem | Marin 3D Forged Alloy, 31.8mm clamp, 35mm extension |
| Grips | Marin MTN, Closed End |
| Headset | FSA No 57E, Semi-Sealed Cartridge Bearings, 1 1/8” × 1 1/2” |
| Seatpost | Marin Alloy, 30.9mm |
| Saddle | Marin DJ Saddle |
| Pedals | Alloy Platform |
| Extras | Marin Chain Tension Device |
Specifications are subject to change without notice
Geometry
| Frame Size | Short |
| A – Stack | 525 |
| B – Reach | 360 |
| C – Headtube Angle | 69° |
| D – Headtube Length | 112 |
| E – Seattube Angle | 69° |
| F – Seattube Length | 320 |
| G – Toptube Effective | ? |
| H – BB Height | ? |
| I – BB Drop | 8mm |
| J – Chainstay | 369 |
| K – Wheelbase | ? |
| L – Standover Height | ? |
| M – Fork Offset | 42 |
| Seatpost Diameter | 30.9 |
| Handlebar Width | 700 |
| Stem Length | 35 |
| Crank Length | 152 |
Want to compare the size of your current bike to this one? Read our Reach and Stack guide here.
Additional Information
| Manufacturer | Marin |
|---|---|
| RRP | No |
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