
SRAM DUB BB30 Bottom Bracket Road Wide, BB30, 68mm
68mm
Velopedia Bicycle Archive
Original specifications: geometry for 6 published sizes.
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At a glance
| Frame Construction | FACT 10r carbon, OSBB, full internal cable routing, internally integrated seat clamp, 130mm rear spacing |
|---|---|
| Frame Material | Carbon Fiber |
| Fork | S-Works FACT carbon, full monocoque, size-specific taper |
| Fork Material | Carbon Fiber |
| Shifters | SRAM eTap |
|---|---|
| Front Derailleur | SRAM eTap, braze-on |
| Rear Derailleur | SRAM eTap, 11-speed |
| Crankset | SRAM S952, Yaw BB30; chainrings: 52/36T |
| Bottom Bracket | SRAM BB30, 68mm, no spacer |
| BB Shell Width | 68 mm |
| Cassette | SRAM PG-1170, 11-speed |
| Chain | SRAM PC-1170, 11-speed |
| Pedals | Nylon, 105x78x28mm, loose balls w/ reflectors |
| Brakes | (F) SRAM Force / (R) SRAM Force |
|---|
| Handlebar | Specialized Expert Shallow Drop, alloy, 123mm drop, 75mm reach |
|---|---|
| Stem | Specialized Pro SL, alloy, 4-bolt |
| Saddle | Body Geometry Toupé Expert Gel, Adaptive Edge design, hollow titanium rails, 143mm |
| Seatpost | S-Works FACT carbon, 20mm offset |
| Wheels | (F) DT R460 Pro / (R) DT R460 Pro |
|---|---|
| Front Tire | S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x24mm |
| Rear Tire | S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x24mm |
Frame measurements by size.
Frame diagram
Select an available measurement to locate it on the frame.
| Measurement | 49 | 52 | 54 | 56 | 58 | 61 |
|---|---|---|---|---|---|---|
| Seat tube | 431 mm | 462 mm | 481 mm | 501 mm | 522 mm | 553 mm |
| Effective top tube | 518 mm | 537 mm | 548 mm | 565 mm | 582 mm | 600 mm |
| Head tube | 100 mm | 120 mm | 140 mm | 160 mm | 190 mm | 210 mm |
| Head-tube angle | 72.25° | 73° | 73° | 73.5° | 73.5° | 74° |
| Seat-tube angle | 75.5° | 74° | 73.5° | 73.25° | 73° | 72.5° |
| Chainstay / rear center | 405 mm | 405 mm | 405 mm | 405 mm | 407 mm | 410 mm |
| Wheelbase | 970 mm | 970 mm | 978 mm | 986 mm | 1003 mm | 1013 mm |
| Bottom-bracket drop | 71.5 mm | 71.5 mm | 69 mm | 69 mm | 67.5 mm | 67.5 mm |
| Bottom-bracket height | 270 mm | 270 mm | 272.5 mm | 272.5 mm | 274 mm | 274 mm |
| Reach | 386 mm | 386 mm | 387 mm | 395 mm | 402 mm | 408 mm |
| Stack | 504 mm | 526 mm | 543 mm | 564 mm | 591 mm | 612 mm |
| Fork offset / rake | 45 mm | 45 mm | 45 mm | 43 mm | 43 mm | 43 mm |
| Front center | 576 mm | 576 mm | 583 mm | 591 mm | 605 mm | 612 mm |
| Trail | 62 mm | 57 mm | 57 mm | 56 mm | 56 mm | 53 mm |
| Fork length / axle-to-crown | 368 mm | 368 mm | 368 mm | 368 mm | 368 mm | 368 mm |
| Seatpost length | 350 mm | 350 mm | 350 mm | 400 mm | 400 mm | 400 mm |
| Crank length | 170 mm | 170 mm | 172.5 mm | 172.5 mm | 175 mm | 175 mm |
| Stem length | 75 mm | 90 mm | 100 mm | 100 mm | 110 mm | 110 mm |
| Handlebar width | 400 mm | 420 mm | 420 mm | 420 mm | 440 mm | 440 mm |
Dimensions as recorded.
Parts & serviceability

68mm
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 Tarmac Expert eTap · Road · Published sizes: 49, 52, 54, 56, 58, 61
Archived: Frame: FACT 10r carbon, OSBB, full internal cable routing, internally integrated seat clamp, 130mm rear spacing · Fork: S-Works FACT carbon, full monocoque, size-specific taper · Carbon Fiber
Archived: Shifters: SRAM eTap · Front derailleur: SRAM eTap, braze-on · Rear derailleur: SRAM eTap, 11-speed · Crankset: SRAM S952, Yaw BB30; chainrings: 52/36T · Bottom bracket: SRAM BB30, 68mm, no spacer · Cassette: SRAM PG-1170, 11-speed · Chain: SRAM PC-1170, 11-speed
Archived: Brakes: (F) SRAM Force / (R) SRAM Force
Archived: Wheels: (F) DT R460 Pro / (R) DT R460 Pro · Front tire: S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x24mm · Rear tire: S-Works Turbo, 120 TPI, folding bead, BlackBelt protection, 700x24mm
Archived: Handlebar: Specialized Expert Shallow Drop, alloy, 123mm drop, 75mm reach · Stem: Specialized Pro SL, alloy, 4-bolt · Seatpost: S-Works FACT carbon, 20mm offset · Saddle: Body Geometry Toupé Expert Gel, Adaptive Edge design, hollow titanium rails, 143mm · Pedals: Nylon, 105x78x28mm, loose balls w/ reflectors
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Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.