Why the Specialized Tarmac?

Nothing is faster than the Tarmac SL8 thanks to a combination of aerodynamics, lightweight, and ride quality previously thought impossible. After eight generations and over two decades of development, it’s more than the fastest Tarmac ever - it’s the world’s fastest race bike. Your legs up for it?

Aerodynamics or lightweight alone don’t win races - speed is what matters. Delivering that speed requires creating an uncompromising combination of aerodynamics, lightweight, stiffness, and compliance. Through race simulations using real world data Specialized knows the Tarmac SL8 is the fastest race bike ever made on the routes that matter - 16.6 seconds faster over 40km, 128 seconds faster over Milan San Remo, 20 seconds faster over the legendary Tourmalet climb.

Technical Details

The engineers at Specialized aimed to make the SL8 more aerodynamic than its predecessor. One of the ways they achieved this is with the Speed Sniffer. By sliding the steer tube position back, it allowed them more freedom when sculpting the head tube into its drag-reducing shape.

  • Speed Sniffer Equipped
  • A Lesson Learnt
  • The Trifecta


44 49 52 54 56 58 61
A Reach 366mm 375mm 380mm 384mm 395mm 402mm 408mm
B Stack 501mm 514mm 527mm 544mm 565mm 591mm 612mm
C Head Tube Angle 70.5° 70.5° 70.5° 70.5° 70.5° 70.5° 70.5°
D Front Center 572mm 574mm 577mm 579mm 592mm 606mm 613mm
E Bottom Bracket Drop 74mm 74mm 74mm 72mm 72mm 72mm 72mm
F Wheelbase 970mm 973mm 975mm 978mm 991mm 1006mm 1013mm
G Chainstay Length 410mm 410mm 410mm 410mm 410mm 410mm 410mm
H Head Tube Length 99mm 109mm 120mm 137mm 157mm 184mm 204mm
I Top Tube Length 496mm 509mm 531mm 541mm 563mm 577mm 595mm
J Seat Tube Angle 75.5° 75.5° 75.5° 75.5° 75.5° 75.5° 75.5°
K Standover Height 723mm 735mm 746mm 768mm 786mm 808mm 834mm
*SL8 Geometry

*All measurements in degrees or millimetres

Frame Sizing

The sizing chart is a great place to start when picking your next bike but everyone will fit a bike a bit differently. Your torso, arm, and leg lengths all play into what size of bike you may need. Plus, there's your own personal preference.

We always recommend swinging by the shop and taking the bike that you're looking for a spin to see how it feels. If you're unable to come by, looking at the geometry of your current bike and comparing it is a good place to start. If you have any further questions, our customer service team is there to help.

Size Height
Imperial Metric
44 4'8" - 5'1" 142 - 155cm
49 5'1" - 5'5" 155 - 163cm
52 5'4" - 5'7" 163 - 170cm
54 5'7" - 5'9" 170 - 175cm
56 5'9" - 5'11" 175 - 180cm
58 5'11" - 6'2" 180 - 188cm
61 6'2" - 6'5" 188 - 196cm
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