
ENVE Twin Bolt Seatpost - Zero Offset UD Carbon, 30.9x400mm
30.9x400mm
Replacement option · verify fit
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Original specifications: 10.89kg (24 lb, .1 oz) published weight · geometry for 1 published size.
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At a glance
| Frame Construction | Specialized A1 Premium Aluminum, 20" Compatible, fully butted tubing, tapered head tube, BSA threaded 73mm BB shell, 12x148 thru-axle sliding dropouts, Single speed or geared compatibile, internal cable routing, 30.9mm seat tube, dropper post compatible |
|---|---|
| Frame Material | Aluminum |
| Fork | Hayes Manitou Junit Comp 20", 80Mm Travel, Tapered Alloy Steer Tube, 15Mm Thru Axle, 40Mm Offset, Post Disc Mount, W/ Fender |
| Fork Material | Aluminum |
| Shifters | microSHIFT Advent SL-M6190, short reach light action trigger+D48 9 speed |
|---|---|
| Rear Derailleur | microSHIFT Advent RD-M6195S, Super Short Cage With Clutch 1X9 Speed |
| Crankset | Specialized P.Series, Forged single speed, 51.5mm CL, 115mm length |
| Bottom Bracket | Square Taper, 73mm Shell Width, 124.5mm Spindle Width |
| BB Shell Width | 73 mm |
| Cassette | microSHIFT, CS-H094, 11T-38T, 9 speed HG freehub |
| Chain | KMC X9EPT, 9-speed, anti-corrosion coating w/ reusable Missing Link™ |
| Pedals | Specialized Platform |
| Brakes | (F) Tektro HD-J285, Short Reach Lever, 160Mm Rotor / (R) Tektro HD-J285, Short Reach Lever, 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", 28h, 26mm internal width, Disc Brake Only |
| Spokes | Stainless, 14g |
| Front Tire | Specialized Ground Control Control, 20 x 2.35 |
| Rear Tire | Specialized Ground Control Control, 20 x 2.35 |
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: 2024 Specialized P.1 Trail · Specialty
Archived: Frame: Specialized A1 Premium Aluminum, 20" Compatible, fully butted tubing, tapered head tube, BSA threaded 73mm BB shell, 12x148 thru-axle sliding dropouts, Single speed or geared compatibile, internal cable routing, 30.9mm seat tube, dropper post compatible · Fork: Hayes Manitou Junit Comp 20", 80Mm Travel, Tapered Alloy Steer Tube, 15Mm Thru Axle, 40Mm Offset, Post Disc Mount, W/ Fender · Aluminum
Archived: Fork: Hayes Manitou Junit Comp 20", 80Mm Travel, Tapered Alloy Steer Tube, 15Mm Thru Axle, 40Mm Offset, Post Disc Mount, W/ Fender
Archived: Shifters: microSHIFT Advent SL-M6190, short reach light action trigger+D48 9 speed · Rear derailleur: microSHIFT Advent RD-M6195S, Super Short Cage With Clutch 1X9 Speed · Crankset: Specialized P.Series, Forged single speed, 51.5mm CL, 115mm length · Bottom bracket: Square Taper, 73mm Shell Width, 124.5mm Spindle Width · Cassette: microSHIFT, CS-H094, 11T-38T, 9 speed HG freehub · Chain: KMC X9EPT, 9-speed, anti-corrosion coating w/ reusable Missing Link™
Archived: Brakes: (F) Tektro HD-J285, Short Reach Lever, 160Mm Rotor / (R) Tektro HD-J285, Short Reach Lever, 160Mm Rotor
Archived: Rims: Specialized P.Series, 20", 28h, 26mm internal width, Disc Brake Only · Hubs: (F) Alloy, 6-Bolt, 28H, 15x110 Boost / (R) Alloy, 6-Bolt, 28H, 12x148 Boost, 11-speed compatiable · Front tire: Specialized Ground Control Control, 20 x 2.35 · Rear tire: Specialized Ground Control Control, 20 x 2.35
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
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.