
ENVE Twin Bolt Seatpost - Zero Offset UD Carbon, 30.9x400mm
30.9x400mm
Replacement option · verify fit
Velopedia Bicycle Archive
Original specifications: geometry for 1 published size.
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At a glance
| Frame Construction | Specialized A1 premium butted alloy, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger, stealth rack mounts, dropper post compatible |
|---|---|
| Frame Material | Aluminum |
| Fork | SR Suntour XCM 26, 30mm stanchions, Rx Tune, coil spring, QR, 80mm travel (size-specific), 40mm offset |
| Shifters | Microshift, SL-M859R, 2x9 |
|---|---|
| Front Derailleur | microSHIFT FD-M462, 2-speed |
| Rear Derailleur | Microshift RD-M46L, 9spd |
| Crankset | Stout 2x, forged alloy |
| Bottom Bracket | Square-tapered, 73mm, internal bearings, 122.5mm spindle |
| BB Shell Width | 73 mm |
| Cassette | SunRace, 9-Speed, 11-36t |
| Chain | KMC X9EPT, 9-speed, anti-corrosion coating w/ reusable Missing Link™ |
| Pedals | SBC-54 Flat pedal |
| Brakes | (F) Tektro HD-M276, short-reach lever, hydraulic disc, 160mm / (R) Tektro HD-M276, short-reach lever, hydraulic disc, 160mm |
|---|
| Handlebar | Specialized, alloy, 9-degree backsweep, 15mm rise, 31.8mm |
|---|---|
| Stem | Stout 3D-forged alloy, 31.8mm, 6-degree rise |
| Saddle | Bridge Sport, steel rails |
| Seatpost | Alloy, 2-bolt clamp, 30.9mm |
| Hubs | (F) Formula 6-Bolt, disc, 100x9mm spacing, quick-release, 32H / (R) Formula SP-2125, 6-Bolt freehub, disc, 135x9mm spacing, quick-release |
|---|---|
| Rims | Specialized alloy, disc only, double-wall, 25mm inner width, 32h |
| Spokes | Stainless, 14g |
| Front Tire | Fast Trak Sport, 26x2.35" |
| Rear Tire | Fast Trak Sport, 26x2.35" |
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
| Measurement | XXS |
|---|---|
| Seat tube | 310 mm |
| Effective top tube | 516 mm |
| Head tube | 95 mm |
| Head-tube angle | 68° |
| Seat-tube angle | 73.5° |
| Chainstay / rear center | 420 mm |
| Wheelbase | 1017 mm |
| Bottom-bracket drop | 44 mm |
| Bottom-bracket height | 295 mm |
| Reach | 355 mm |
| Stack | 543 mm |
| Standover height | 647 mm |
| Fork offset / rake | 40 mm |
| Front center | 601 mm |
| Trail | 94 mm |
| Fork length / axle-to-crown | 455 mm |
| Seatpost length | 300 mm |
| Crank length | 160 mm |
| Stem length | 35 mm |
| Handlebar width | 700 mm |
Dimensions as recorded.
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: 2022 Specialized Rockhopper Sport 26 · Mountain · Published sizes: XXS
Archived: Frame: Specialized A1 premium butted alloy, zero-stack head tube, internal cable routing, 135x9mm forged dropouts, chainstay-mounted disc brake, replaceable alloy derailleur hanger, stealth rack mounts, dropper post compatible · Fork: SR Suntour XCM 26, 30mm stanchions, Rx Tune, coil spring, QR, 80mm travel (size-specific), 40mm offset
Archived: Fork: SR Suntour XCM 26, 30mm stanchions, Rx Tune, coil spring, QR, 80mm travel (size-specific), 40mm offset
Archived: Shifters: Microshift, SL-M859R, 2x9 · Front derailleur: microSHIFT FD-M462, 2-speed · Rear derailleur: Microshift RD-M46L, 9spd · Crankset: Stout 2x, forged alloy · Bottom bracket: Square-tapered, 73mm, internal bearings, 122.5mm spindle · Cassette: SunRace, 9-Speed, 11-36t · Chain: KMC X9EPT, 9-speed, anti-corrosion coating w/ reusable Missing Link™
Archived: Brakes: (F) Tektro HD-M276, short-reach lever, hydraulic disc, 160mm / (R) Tektro HD-M276, short-reach lever, hydraulic disc, 160mm
Archived: Rims: Specialized alloy, disc only, double-wall, 25mm inner width, 32h · Hubs: (F) Formula 6-Bolt, disc, 100x9mm spacing, quick-release, 32H / (R) Formula SP-2125, 6-Bolt freehub, disc, 135x9mm spacing, quick-release · Front tire: Fast Trak Sport, 26x2.35" · Rear tire: Fast Trak Sport, 26x2.35"
Archived: Handlebar: Specialized, alloy, 9-degree backsweep, 15mm rise, 31.8mm · Stem: Stout 3D-forged alloy, 31.8mm, 6-degree rise · Seatpost: Alloy, 2-bolt clamp, 30.9mm · Saddle: Bridge Sport, steel rails · Pedals: SBC-54 Flat pedal
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.