
ENVE Twin Bolt Seatpost - Zero Offset UD Carbon, 30.9x400mm
30.9x400mm
Replacement option · verify fit
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Original specifications: geometry for 4 published sizes.
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At a glance
| Frame Construction | FACT 10m, full carbon frame, 12x197mm thru-axle rear, internal cable routing, ISCG XC tabs, suspension corrected for 100mm of travel |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | Carbon, 46mm offset, tapered steerer, 150mm axle spacing |
| Fork Material | Carbon Fiber |
| Shifters | SRAM X9, 10-speed, trigger |
|---|---|
| Rear Derailleur | SRAM X0, long cage, 10-speed |
| Crankset | RaceFace Turbine Cinch crankset, alloy, 30mm spindle, direct-mount chainring, 76.5mm chainline, 11-speed |
| Cassette | SunRace, 10-speed, 11-42t |
| Chain | 10-speed, EXTRA lightweight hollow outer links w/reusable Missing Link # CL559R |
| Pedals | Specialized Dirt Pedals |
| Brakes | (F) Shimano Deore, hydraulic disc, resin pads, post mount, 160mm rotor / (R) Shimano Deore, hydraulic disc, resin pads, 160mm rotor |
|---|
| Handlebar | Specialized XC, butted 6061 alloy, 8-degree backsweep, 6-degree upsweep, 10mm rise, 31.8mm |
|---|---|
| Stem | Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise |
| Saddle | Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm |
| Seatpost | Specialized 2-bolt head, forged alloy, 8mm offset, micro-adjust, 30.9mm |
| Hubs | (F) Specialized Stout XC, alloy disc, double-sealed cartridge bearings, 15x150mm thru-axle, 32h / (R) Stout XC, disc alloy, sealed cartridge bearings, 12x148mm thru-axle, 32h |
|---|---|
| Rims | Specialized 26" disc front, 21mm depth, 86mm internal width, 32h |
| Spokes | Stainless, butted, 2.0/1.8/2.0mm, black |
| Front Tire | Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.0" |
| Rear Tire | Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.0" |
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Seat tube | 394 mm | 434 mm | 470 mm | 520 mm |
| Effective top tube | 579 mm | 604 mm | 626 mm | 651 mm |
| Head tube | 94 mm | 94 mm | 110 mm | 125 mm |
| Head-tube angle | 70.5° | 70.5° | 70.5° | 70.5° |
| Seat-tube angle | 73° | 73° | 73° | 73° |
| Chainstay / rear center | 455 mm | 455 mm | 455 mm | 455 mm |
| Wheelbase | 1088 mm | 1113 mm | 1135 mm | 1161 mm |
| Bottom-bracket drop | 60 mm | 60 mm | 60 mm | 60 mm |
| Bottom-bracket height | 307 mm | 307 mm | 307 mm | 307 mm |
| Reach | 395 mm | 420 mm | 437 mm | 458 mm |
| Stack | 602 mm | 602 mm | 617 mm | 632 mm |
| Fork offset / rake | 47 mm | 47 mm | 47 mm | 47 mm |
| Front center | 640 mm | 665 mm | 687 mm | 713 mm |
| Trail | 80 mm | 80 mm | 80 mm | 80 mm |
| Fork length / axle-to-crown | 496 mm | 496 mm | 496 mm | 496 mm |
| Seatpost length | 350 mm | 350 mm | 400 mm | 400 mm |
| Crank length | 170 mm | 175 mm | 175 mm | 175 mm |
| Stem length | 60 mm | 60 mm | 75 mm | 75 mm |
| Handlebar width | 750 mm | 750 mm | 750 mm | 750 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: 2017 Specialized Fatboy Comp Carbon · Mountain · Published sizes: S, M, L, XL
Archived: Frame: FACT 10m, full carbon frame, 12x197mm thru-axle rear, internal cable routing, ISCG XC tabs, suspension corrected for 100mm of travel · Fork: Carbon, 46mm offset, tapered steerer, 150mm axle spacing · Carbon Fiber
Archived: Shifters: SRAM X9, 10-speed, trigger · Rear derailleur: SRAM X0, long cage, 10-speed · Crankset: RaceFace Turbine Cinch crankset, alloy, 30mm spindle, direct-mount chainring, 76.5mm chainline, 11-speed · Cassette: SunRace, 10-speed, 11-42t · Chain: 10-speed, EXTRA lightweight hollow outer links w/reusable Missing Link # CL559R
Archived: Brakes: (F) Shimano Deore, hydraulic disc, resin pads, post mount, 160mm rotor / (R) Shimano Deore, hydraulic disc, resin pads, 160mm rotor
Archived: Rims: Specialized 26" disc front, 21mm depth, 86mm internal width, 32h · Hubs: (F) Specialized Stout XC, alloy disc, double-sealed cartridge bearings, 15x150mm thru-axle, 32h / (R) Stout XC, disc alloy, sealed cartridge bearings, 12x148mm thru-axle, 32h · Front tire: Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.0" · Rear tire: Ground Control Fat, Control casing, 120 TPI, Aramid folding bead, 2Bliss Ready, 26x4.0"
Archived: Handlebar: Specialized XC, butted 6061 alloy, 8-degree backsweep, 6-degree upsweep, 10mm rise, 31.8mm · Stem: Specialized Trail, 3D-forged alloy, 4-bolt, 6-degree rise · Seatpost: Specialized 2-bolt head, forged alloy, 8mm offset, micro-adjust, 30.9mm · Saddle: Body Geometry Phenom Comp, hollow Cr-Mo rails, 143mm · Pedals: Specialized Dirt Pedals
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.