Specialized P.1 Dirt Jumper (Deep Marine) (20")

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Specialized P.1 Dirt Jumper (Deep Marine) (20")
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Price: $649.99 (Save 23%)
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Specialized P.1 Dirt Jump Bike Description:

The Specialized P.1 Dirt Jump Bike was created to get young riders out shredding and having fun at an early age on a bike designed for progression and safety. The aluminum frame, fork and bars keep this bike light enough for smaller riders to ride with control while remaining strong and durable to ensure your little ripper is safe. The bike is equipped with a rigid fork while the geometry is designed to be compatible with an 80mm travel suspension fork if you choose to add on. The bike rides on a lightweight and strong P.Series 20" wheelset with all sealed bearings.

The P1 comes set up as a single speed, standard in the dirt jump world. For those who crave gears, the P.1's adjustable dropouts are compatible with a rear derailleur, offering versatility for your riding preferences. This bike adapts to your evolving needs, whether you're pushing the limits or cruising through the trails.

The 20" P.1 Bike is designed for riders in the ballpark of 3'8" up to 4'4" tall.


  • Frame: Specialized P.1, A1 Premium Alloy, Fully Butted Tubing, Tapered Head Tube, Internal cable routing (20") (BSA 73mm BB Shell) (12 x 148 Thru-Axle) (Sliding Dropouts) (Single Speed or Geared Compatible) (52mm Chainline) (30.9 Seat Tube) (Dropper Post Compatible)
  • Fork: Specialized A1 Alloy, Rigid, Tapered Alloy Steer Tube (20") (15 x 110 Thru-Axle) (372mm Axle to Crown)
  • Headset: Tapered
  • Stem: 3D-forged alloy (31.8mm) (6° Rise)
  • Bars: Mini Rise, Alloy Double Butted (600mm Width) (6° Backsweep) (31.8mm Clamp Diameter) (19mm Bar End Diameter)
  • Grips: Specialized Trail Grips (Lock-on) (19mm bar end diameter)
  • Cranks: Specialized P.Series (115mm Length) (52mm Chainline)
  • Bottom Bracket: BSA 73mm
  • Pedals: Specialized Platform Pedal
  • Sprocket: 30T
  • Chain: KMC Z1 (1/2 x 3/32") (Single Speed)
  • Front Hub: Alloy (6-Bolt) (28H) (15 x 110 Boost)
  • Rear Hub: Alloy (6-Bolt) (28H) (12 x 148 Boost) (11-speed compatible)
  • Cog: 13T SS Cog
  • Front Rim: Specialized P.Series (20") (32H) (26mm ID) (Disc Brake Only)
  • Rear Rim: Specialized P.Series (20") (32H) (26mm ID) (Disc Brake Only)
  • Front Tire: Specialized Kicker Sport (20 x 2.1")
  • Rear Tire: Specialized Kicker Sport (20 x 2.1")
  • Seat: Specialized P.Series, Steel Rails
  • Seat Post: Specialized, 6061 alloy (30.9mm) (2-bolt clamp) (0mm setback)
  • Seat Clamp: Quick Release (34.9mm)
  • Front Brakes: Radius CX7, Mechanical Disc
  • Rear Brakes: Radius CX7, Mechanical Disc
  • Extras: -
  • Color: Deep Marine
  • Weight: -


  • Toptube Length: 449mm (effective)
  • Reach: 310mm
  • Wheelbase: 840mm
  • Chainstay Length: 320mm
  • Headtube Angle: 68.5°
  • Seattube Angle: 72°
  • Bottom Bracket Height: 259mm
  • Standover: 561mm

For assistance building your new bike, please check out our tech help section here for instructions and tips on how to build your bike to ensure it is safe.

Dan's Comp recommends riding with a helmet to protect that brain. Shop our selection of helmets here.

Need help finding the right bike for you? Not sure what size would suit you best? Check out our BMX buyers guide video below!

Note: To ensure that every component on your bicycle is working properly, Dan's Comp recommends that all bikes be assembled by a qualified mechanic. Improper assembly of your bicycle may lead to premature wear or failure of individual components such as headsets, crank assembly and wheels. Failure to do so may void the manufacturer warranty.

This product was added to our catalog on August 14, 2023

Justin Harris
Sunday, Apr 21 2024 (3 months ago)
Specialized P.1 Dirt Jumper (Deep Marine) (20")
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Sizing Recommendations for Riders Who Fall Between Sizes:

  • Sizing down will provide a more maneuverable ride while sizing up will provide more stability
Rider Height (Feet)Rider Height (CM)
P.13'8" - 4'4"111 - 132cm
P.24'3" - 5'0"129 - 152cm
P.34'10" - 6'0"147 - 183cm
P.45'8" - 6'6"172 - 198cm

Note: All sizing recommendations are provided by the manufacturer and may differ for each rider.



Crank Length115mm140mm165mm165mm
Handlebar Width600mm680mm750mm750mm
Stem Length35mm35mm35mm35mm
Saddle Width110mm110mm110mm110mm
Seatpost Length200mm200mm200mm200mm
BB Drop5mm25mm22mm34mm
BB Height259mm290mm318mm318mm
Bike Standover Height561mm645mm691mm697mm
Chainstay Length320mm360mm385mm385mm
Fork Length (Full)380mm455mm480mm492mm
Fork Rake/Offset40mm40mm37mm44mm
Front Center520mm600mm668mm711mm
Headtube Angle68.5°68.5°68.5°68.5°
Headtube Length90mm95mm115mm120mm
Seat Tube Angle72°72°72°72°
Seat Tube Length265mm300mm335mm350mm
Top-tube Length (horizontal)449mm530mm598mm636mm

Note: All measurements are provided by the manufacturer and may vary depending on how measurements are acquired.