10-year Anniversary SALE: Get 10% OFF EVERYTHING we make!

Alpha X Installation Guide

Alpha X now comes standard with Tilt Hardware and Ergo Cups! The guide below reflects installation with the Tilt Hardware. For the older guide for legacy parts (without tilt), Click Here.

Stem Hardware

  • Begin by removing the headset cap and any round spacers already on your fork. The Alpha X is designed with aero-matched stem spacers and an ultra-low dust cap for superior aerodynamic performance. Depending on your headset, you may or may not need to install some or all of the micro shims just below the dust cap. Each micro shim is 0.25mm thick. Most headsets will not require them. However, if there is play in your system after installation, some shims may be required.
  • The Alpha X can be used with any number of round spacers above the stem portion, allowing you to leave room to adjust your position upwards in the future if desired. The stem is designed for best aerodynamic performance when used with 10mm or less of round spacers above the stem. At a minimum, use a 5mm spacer (included with the stem), and trim your steerer tube so that it ends 2-3mm below the top surface of that spacer.
  • With the cable cover removed, install the Alpha X onto your fork as you would any other stem. Follow the torque specification of your headset for the headset preload bolt (in general, just enough torque to remove any play from the steerer column). Apply carbon paste around the steerer tube, and all interior surfaces of the Alpha X stem clamping zone, including the wedge-style steerer clamp. Install the wedge-style steerer clamp assembly, and adjust the stem so that your stem is in line with the front wheel. Then use 15-18 Nm of torque on the single M6 socket screw in the wedge-style steerer clamp to tighten the Alpha X to your steerer tube.
  • The Alpha X features advanced cable routing for use with any drivetrain, as well as centerpull brakes like the TriRig Omega X. The brake routing system features a removable cable stop so that you can either run bare cable to your brake with the stop in place, or run full housing or a hydraulic line by removing the cable stop. For installations with the cable stop, the optimal housing length will depend on your particular equipment, but for aerodynamic purposes, it's best to attempt to route the cable such that it hides behind the frontal profile of your handlebars. That is, attempt to route the front brake cable housing so that it is not visible when viewed from the front of your bicycle.

Extension Hardware

  • The Alpha X is designed to accept extensions built with an industry-standard 22.2mm outer diameter. It can be purchased with our own TriRig Gamma extensions which allow a variety of different positions to be achieved. However, it can also be purchased without any extensions so that you can use your own. Any standard extension may be used. Some older extensions use a 22.0mm diameter instead of the more common 22.2mm standard. These undersized extensions may be difficult to tighten down, and we cannot guarantee fit. However, we have successfully tested some 22.0mm extensions in the bar, and they fit well. So if you have a favorite extension in the 22.0mm standard, there's a good chance it will work in the Alpha X.
  • Standard Overmount Setup: For standard setups (extensions over the bar), you will need one set of curved Extension Washers, which sit directly on top of the Base Bar. Leave the extensions themselves aside, they will be installed last. On top of the Extension Washers, stack any Extension Spacers you are using, then the Tilt Spacer, and finally the Extension Clamps. Secure the Extension Clamps using the Tilt Washer and Thru Bolts, tightening to a torque of 6-7 Nm. Once both Extension Clamps are in place, and at the same degree of tilt, add the BTA Mount, and finally the Arm Cups. Secure the Arm Cups with the M6 x 12mm Countersunk Bolts, tightened to a torque of 2-3 Nm. Refer to the diagrams below for an exploded view:

  • Alpha X comes with six sets of Thru Bolts, of varying lengths. The appropriate Thru Bolt to use will depend on how many spacers you have used. Each set of Thru Bolts is in a separate bag, marked appropriately for how many spacers it should be used for. Note that the 6-7 Nm used to torque the Thru Bolts is far less than on some other aerobar systems. Alpha X's simple design allows us to use far less torque and still keep everything together. This is an easier, safer design, and also reduces the possibility of damage during installation from a stripped screw, etc.
    • 0-5mm in Spacers: use 30mm Thru Bolts.
    • 10-15mm in Spacers: use 40mm Thru Bolts.
    • 20-25mm in Spacers: use 50mm Thru Bolts.
    • 30-35mm in Spacers: use 60mm Thru Bolts.
    • 40-45mm in Spacers: use 70mm Thru Bolts.
    • 50-55mm in Spacers: use 80mm Thru Bolts.
  • Slammed Overmount Setup: For the lowest possible stack using a standard (overmount) setup, we have developed a special "Slammed Overmount" setup. Instead of using the usual Extension Washer and Tilt Spacer, simply use the Slammed Tilt Spacer part, included in the "Slammed Setup" hardware bag. Use the enclosed 25mm Thru Bolts to secure the Extension Clamps.
  • For Under-Mount Setups (extensions underneath the bar), the installation procedure is similar to the standard setup above. However, in order to mount the Extension Clamps underneath the aerobar, you will need to use the additional set of curved Extension Washers, used between the Extension Clamps and the bottom of the Base Bar. Also, you will need the special Clamp Nuts which will nest into the Extension Clamps. Instead of the standard M6 Thru Bolts, use the special M5 Thru Bolts provided with the Undermount Kit. Stack the setup according to the diagram below, and tighten to a torque of 5-6 Nm.

  • Finally, slip the extensions into the Extension Clamps and tighten the two M4 screws to a torque of 4-5 Nm.

    Note that in almost all cases, you can access the Extension Clamp bolts and the Thru Bolts at any time via the other holes in the arm cups. Simply remove the velcro pads, and you've got access to the Thru Bolts and Extension Clamp bolts.

Additional Measurements: