
ENVE Twin Bolt Seatpost - Zero Offset UD Carbon, 30.9x400mm
30.9x400mm
Replacement option · verify fit
Velopedia Bicycle Archive
Original specifications: 9.37kg (20 lb, 10.5 oz) published weight · geometry for 1 published size.
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At a glance
| Frame Construction | Specialized P.1, A1 Premium Alloy, 20", Fully Butted Tubing, Tapered Head Tube, BSA 73mm BB Shell, 12x148TA Sliding Dropouts, Single Speed or Geared Compatible, 52mm CL, Internal cable routing, 30.9 Seat Tube, Dropper Post Compatible |
|---|---|
| Frame Material | Aluminum |
| Fork | Specialized A1 Alloy, 20" Rigid, Tapered Alloy Steer Tube, 15x110TA, 372mm Axle to Crown |
| Fork Material | Aluminum |
| Crankset | Specialized P.series, 52mm CL, 115mm Length |
|---|---|
| Bottom Bracket | BSA 73mm |
| BB Shell Width | 73 mm |
| Cassette | 13T SS Cog |
| Chain | KMC Z1, 1/2x3/32", Single Speed |
| Pedals | Specialized Platform Pedal |
| Brakes | (F) Tektro HD-J285, Hydraulic Disc, 160mm Rotor / (R) Tektro HD-J285, Hydraulic Disc, 160mm Rotor |
|---|
| Handlebar | Mini Rise, Alloy Double Butted, 6-degree Backsweep, 600mm Width, 31.8mm , 19mm Bar End Diameter |
|---|---|
| Stem | 3D-forged alloy, 31.8mm, 6-degree rise |
| Saddle | Specialized P.series, Steel Rails |
| Seatpost | Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mm |
| Hubs | (F) Alloy, 6-Bolt, 28H, 15x110 Boost / (R) Alloy, 6-Bolt, 28H, 12x148 Boost, 11-speed compatiable |
|---|---|
| Rims | Specialized P.Series, 20", 32h, 26mm ID, Disc Brake Only |
| Spokes | Stainless, 14g |
| Front Tire | Specialzied Kicker Sport, 20x2.1" |
| Rear Tire | Specialzied Kicker Sport, 20x2.1" |
Frame measurements by size.
Reference frame view
Select an available measurement to locate it on the frame.
| Measurement | 20" |
|---|---|
| Seat tube | 265 mm |
| Effective top tube | 449 mm |
| Head tube | 90 mm |
| Head-tube angle | 68.5° |
| Seat-tube angle | 72° |
| Chainstay / rear center | 320 mm |
| Wheelbase | 840 mm |
| Bottom-bracket drop | 5 mm |
| Bottom-bracket height | 259 mm |
| Reach | 310 mm |
| Stack | 429 mm |
| Fork offset / rake | 40 mm |
| Front center | 520 mm |
| Trail | 61 mm |
| Fork length / axle-to-crown | 380 mm |
| Crank length | 115 mm |
| Stem length | 35 mm |
| Handlebar width | 600 mm |
| Wheel size | 20inch |
Measurements may vary by configuration, wheel size, or frame setting where noted in the published chart.
Parts & serviceability

30.9x400mm
Replacement option · verify fit
Based on the original build. Confirm the model, size and fit before ordering; installed parts may differ. As an Amazon Associate I earn from qualifying purchases. Velopedia may also earn from qualifying eBay purchases. Velopedia may also earn from qualifying retailer purchases.
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Archived: 2023 Specialized P.1 · Specialty
Archived: Frame: Specialized P.1, A1 Premium Alloy, 20", Fully Butted Tubing, Tapered Head Tube, BSA 73mm BB Shell, 12x148TA Sliding Dropouts, Single Speed or Geared Compatible, 52mm CL, Internal cable routing, 30.9 Seat Tube, Dropper Post Compatible · Fork: Specialized A1 Alloy, 20" Rigid, Tapered Alloy Steer Tube, 15x110TA, 372mm Axle to Crown · Aluminum
Archived: Crankset: Specialized P.series, 52mm CL, 115mm Length · Bottom bracket: BSA 73mm · Cassette: 13T SS Cog · Chain: KMC Z1, 1/2x3/32", Single Speed
Archived: Brakes: (F) Tektro HD-J285, Hydraulic Disc, 160mm Rotor / (R) Tektro HD-J285, Hydraulic Disc, 160mm Rotor
Archived: Rims: Specialized P.Series, 20", 32h, 26mm ID, Disc Brake Only · Hubs: (F) Alloy, 6-Bolt, 28H, 15x110 Boost / (R) Alloy, 6-Bolt, 28H, 12x148 Boost, 11-speed compatiable · Front tire: Specialzied Kicker Sport, 20x2.1" · Rear tire: Specialzied Kicker Sport, 20x2.1"
Archived: Handlebar: Mini Rise, Alloy Double Butted, 6-degree Backsweep, 600mm Width, 31.8mm , 19mm Bar End Diameter · Stem: 3D-forged alloy, 31.8mm, 6-degree rise · Seatpost: Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mm · Saddle: Specialized P.series, Steel Rails · Pedals: Specialized Platform Pedal
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.