The Tarmac's use of fully integrated cables within the bars, stem, and frame mean that it's important to determine your drivetrain first (electric or manual) before cockpit assembly.

After you choose your drivetrain, select the proper headset cover: 

  • Integrated Tarmac Stem with electronic shifting
  • Integrated Tarmac Stem with mechanical shifting
  • Universal cap for a standard stem and round spacers with either electronic or mechanical shifting

All three headset covers are included in the small parts box, or can be ordered as the plastic parts kit S202500009.

Lower headset cover-mechanicalLower headset cover-electricLower headset cover-non Tarmac stem


If the rider is using a Tarmac stem, there are three 10mm spacers and one 5mm spacer available. The upper headset transition cover is placed on top of the spacers (if used). There is no upper headset transition cover if the rider is using a non-Tarmac stem. These are also included in the small parts box and the plastic parts kit S202500009. These spacers can be used to fine-tune fit.

Upper headset cover5mm spacer10mm spacer

Stem adjustment

If you wish to install a longer or shorter stem on your Tarmac, the internally routed Tarmac stem is available in sizes ranging from 70mm to 140mm, with 6 or 12 degrees of rise. Contact your Specialized retailer if you wish to purchase an additional stem, or you can purchase one online at www.specialized.com. Please note that the Tarmac stem uses a non-standard torque pattern as shown below.  The upper bolts must be tightened and torqued so there is no gap at the top of the stem faceplate (1 in image below) before the bottom bolts are tightened and torqued.

Image of stem torque requirements -click to enlarge

After the stem is installed, the Tarmac uses a top cap (same part as the Venge) S182500012.

There are two stem cover options: open and closed. If a rider chooses to cut their steerer flush with the stem, they should use the closed stem cover. If the rider wishes to use an additional spacer above the stem, they should use the open stem cover.  Both Stem Covers are included in the plastic parts kit (S202500009).

Closed stem coverOpen stem cover