
ENVE Twin Bolt Seatpost - Zero Offset UD Carbon, 30.9x400mm
30.9x400mm
Replacement option · verify fit
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Original specifications: geometry for 1 published size.
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At a glance
| Frame Construction | Specialized A1 Premium Aluminum, 24" 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 | Manitou J-Unit Comp 24", 100mm Travel, DJ Tune, 15x110mm thru-axle, Tapered ST |
| Crankset | Prowheel, BSA-73, 140mm, Forged Arm, 30T, Boost |
|---|---|
| Bottom Bracket | 73mm BSA,24mm Spindle Diameter |
| BB Shell Width | 73 mm |
| Cassette | 13T |
| Chain | KMC Z610, single speed, 1/2x3/32" |
| Pedals | Specialized, platform |
| Brakes | (F) Tektro, mechanical disc, resin pads, 160mm / (R) SRAM Level T hydraulic disc, 2-Piston Caliper |
|---|
| Handlebar | Specialized P.Series MTB Dirt, 6061 alloy, 9-degree backsweep, 6-degree upsweep, 38mm rise, 750mm width, 31.8mm clamp |
|---|---|
| Stem | 35mm Specialized Alloy Trail Stem |
| Saddle | Soder Dirt, steel rails |
| Seatpost | Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mm |
| Hubs | (F) Specialized alloy front hub disc, sealed cartridge bearings, 6-bolt, 15x110mm thru-axle, 32h / (R) Bear Pawl, 6-bolt, 12x148TA, 32h, single speed |
|---|---|
| Rims | P.Series, 32 Hole, 26mm ID, disc brake only |
| Spokes | Stainless, 14g |
| Front Tire | Specialized Kicker Sport, 24x2.1" |
| Rear Tire | Specialized Kicker Sport, 24x2.1" |
Frame measurements by size.
Reference frame view
Select an available measurement to locate it on the frame.
| Measurement | 24" |
|---|---|
| Seat tube | 300 mm |
| Effective top tube | 530 mm |
| Head tube | 95 mm |
| Head-tube angle | 68.5° |
| Seat-tube angle | 72° |
| Chainstay / rear center | 360 mm |
| Wheelbase | 958 mm |
| Bottom-bracket drop | 25 mm |
| Bottom-bracket height | 290 mm |
| Reach | 360 mm |
| Stack | 517 mm |
| Standover height | 656 mm |
| Fork offset / rake | 40 mm |
| Front center | 600 mm |
| Trail | 81 mm |
| Fork length / axle-to-crown | 455 mm |
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: 2025 Specialized P.2 · Specialty
Archived: Frame: Specialized A1 Premium Aluminum, 24" 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: Manitou J-Unit Comp 24", 100mm Travel, DJ Tune, 15x110mm thru-axle, Tapered ST
Archived: Fork: Manitou J-Unit Comp 24", 100mm Travel, DJ Tune, 15x110mm thru-axle, Tapered ST
Archived: Crankset: Prowheel, BSA-73, 140mm, Forged Arm, 30T, Boost · Bottom bracket: 73mm BSA,24mm Spindle Diameter · Cassette: 13T · Chain: KMC Z610, single speed, 1/2x3/32"
Archived: Brakes: (F) Tektro, mechanical disc, resin pads, 160mm / (R) SRAM Level T hydraulic disc, 2-Piston Caliper
Archived: Rims: P.Series, 32 Hole, 26mm ID, disc brake only · Hubs: (F) Specialized alloy front hub disc, sealed cartridge bearings, 6-bolt, 15x110mm thru-axle, 32h / (R) Bear Pawl, 6-bolt, 12x148TA, 32h, single speed · Front tire: Specialized Kicker Sport, 24x2.1" · Rear tire: Specialized Kicker Sport, 24x2.1"
Archived: Handlebar: Specialized P.Series MTB Dirt, 6061 alloy, 9-degree backsweep, 6-degree upsweep, 38mm rise, 750mm width, 31.8mm clamp · Stem: 35mm Specialized Alloy Trail Stem · Seatpost: Specialized, 6061 alloy, 2-bolt clamp, 0mm setback, 30.9mm · Saddle: Soder Dirt, 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.