Specialized P.4 Dirt Jumper (Satin Aluminum) (27.5")

Temporarily Unavailable
Price: $2,099.99

Please Log in to receive a notification when this item arrives in stock.

Save In List
Note: Manufacturer does not allow coupons
This item is eligible for Super Saver Shipping Learn More
This item earns up to 2100 VIP Reward Points Learn More

Specialized P.4 27.5" Dirt Jump Bike Description:

Specialized took their legendary P.3 dirt jump/slopestyle bike and reformatted it for a slightly larger 27.5" wheel, creating the P.4 model. This is ideal for riders who: are a bit taller, those looking for something to carry a bit more speed, and/or those mountain bike riders not looking to stray too far away from the 29" wheel they are so used to.

The Specialized P.4 27.5" DJ bike features a strong yet lightweight fully butted aluminum frame, the high-end aftermarket Marzocchi Bomber Z1 fork, SRAM Level hydraulic disc rear brakes, and a lightweight and strong single-speed P.Series wheelset. This P.4 uses adjustable dropouts and boost rear spacing that are compatible with a rear derailleur if gears are your thing, along with internal cable routing to keep things clean. The frame is also dropper post compatible, allowing you to make this bike ready for much more than just blasting jumps.

If you've been wanting to get a DJ bike to expand your skills and hit some jumps or pump tracks, but the traditional 26" dirt jump bike just feels a bit too compact, then this Specialized P.4 bike is your ticket to fun.


  • Frame: Specialized P.4 A1 Premium Alloy (27.5") (Fully Butted Tubing) (Tapered Head Tube) (BSA 73mm BB Shell) (12 x 148mm Sliding Dropouts) (Single Speed or Geared Compatible) (52mm Chainline) (Internal Cable Routing) (Dropper Post Compatible) (26" Wheel Compatible)
  • Fork: Marzocchi Bomber Z1 (27.5") (100mm Travel) (Grip Damper) (1.5 Tapered Steerer) (15 x 110 Boost) (44mm Offset)
  • Headset: Tapered
  • Stem: Specialized Alloy Trail Stem
  • Bars: Specialized P.Series MTB Dirt, 6061 alloy (38mm rise) (750mm width) (9° back/ 6° upsweep) (31.8mm clamp)
  • Grips: Specialized Trail Grips, lock-on
  • Cranks: Specialized P.Series, Forged 24mm Spindle (52mm Chainline) (165mm Length)
  • Bottom Bracket: BSA 73mm
  • Pedals: Specialized Platform Pedal
  • Sprocket: 30T
  • Chain: KMC Z1, 1/2x3/32", Single Speed
  • Front Hub: Specialized Alloy (Sealed Cartridge Bearing) (6-Bolt) (15 x 148mm) (32H)
  • Rear Hub: Alloy (Single Speed) (Sealed Cartridge Bearings) (12x148mm) (6-Bolt) (32h)
  • Cog: 13T SS Cog
  • Front Rim: Specialized P.Series (27.5") (32h) (26mm ID) (Disc Brake Only)
  • Rear Rim: Specialized P.Series (27.5") (32h) (26mm ID) (Disc Brake Only)
  • Front Tire: Specialized Kicker Sport (27.5 x 2.1")
  • Rear Tire: Specialized Kicker Sport (27.5 x 2.1")
  • Seat: Specialized P.Series, Steel Rails
  • Seat Post: Specialized 6061 Alloy (2-Bolt Clamp) (0mm Setback) (30.9mm)
  • Seat Clamp: Alloy, single-bolt (34.9mm)
  • Front Brake: Radius CX7, Mechanical Disc
  • Rear Brake: Sram Level T, Hydraulic Disc
  • Rotors: 180mm (Front) 160mm (Rear)
  • Extras: -
  • Color: Satin Aluminum
  • Weight: -


  • Toptube Length: 636mm (effective)
  • Reach: 445mm
  • Wheelbase: 1094mm
  • Chainstay Length: 385mm
  • Headtube Angle: 68.5°
  • Seattube Angle: 72°
  • Bottom Bracket Height: 318mm
  • Standover: 697mm

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!

Assembly Note: These bikes are fully built by our expert bike builders, then partially disassembled as needed for shipping. Bikes will arrive to you with some basic assembly still required.

This product was added to our catalog on August 17, 2023

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.