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Alpha BTA Mount




  • The Alpha BTA Mount
    Simple, elegant, aero


  • Exceptionally light weight
    Just 20 grams


  • Skeletal structure preserves
    access to bolts


  • No bolt occlusion, even with
    bottle cage installed


  • Front-on view of the BTA kit
    Extra-short bolts stay hidden


  • The Spacer Kit
    Optional added stack
    (for BTA users only)
  • Alpha BTA Mount



BTA Mount

The world's best aerobar deserves the world's best BTA mount. The Alpha BTA mount is, much like the Alpha itself, both a highly complex design but also very simple in its implementation. Read all about the design process here. The mount is made of solid, unidirectional carbon fiber. Its skeleton-like structure keeps the weight down to an amazingly-low 20g, and it requires NO mounting hardware at all. Why is that? Because it acts like a standard Alpha spacer. You just line it up in your spacer stack tower, and the Alpha's standard thru-bolts keep it in place. It has two positions for bottle placement, and can be flipped forwards or backwards, essentially giving you four different mounting options for your bottle.

The kit includes everything you need: the carbon fiber BTA mount itself, as well as two M5 screws and washers for bottles. And unlike most mounts, these screws are special; we sourced extra-short M5 screws so that they don't protrude under the BTA mount. This thing is as sleek and aerodynamic as they come.

Keep in mind, this BTA mount is ONLY compatible with the TriRig Alpha aerobar. It will not work on any other bar.

Spacer Kit

An additional benefit of the BTA mount is that it provides additional structural strength to the spacer stack of the bar. Those of you who max out the Alpha's spacer tower may notice it's not quite as stable with all 35mm of spacers as it is if you have no spacers at all. The BTA mount brings rock-solid stability back to the bar.

So, since the mount affords extra stability, we can offer additional spacers to those of you using the mount. As an optional extra with the BTA mount, you can order the extra Spacer Kit, which allows you to go up another 10mm or 20mm of stack height. The Spacer Kit includes two 10mm spacers, two 20m spacers, four 85mm thru-bolts, and four 95mm thru-bolts. This Spacer Kit can ONLY be purchased WITH the BTA Mount. It is not available separately, because as mentioned above, these extra spacers would result in an unstable tower. The extra stack height requires the BTA mount to lock the towers together and provide that stability.



TriRig Speed Concept Clamps




  • Simplicity defined


  • Just two bolts per side


  • Sleek, minimal appearance
  • Speed Concept Clamps

    Version: Out of stock

Currently out of stock of the top caps, but they aren't necessary for these to function properly.

These clamps are compatible with the aerobars for the first-generation Trek Speed Concept 9-series (model years 2009 through 2013), and also compatible with the 2012 Bontrager RXL aerobar, which uses the same clamping hardware.

The clamps significantly clean up the front-end hardware of the Speed Concept or Bontrager RXL aerobar, reduce the bolt count from 14 to 4, and drop over 200 grams of weight in the process. Read the whole scoop here. Each clamp starts as a one-pound block of 7075-grade aluminum (stronger than the cheaper 6061 on stock parts). They're CNC machined down to just 26 grams each, then black anodized. They will accept any standard aftermarket extension. The optional top caps shown in the video are available if desired. You must use at least 5mm of spacers beneath these clamps (some Speed Concept bars have a 5mm spacer bonded to the bar already).

A note about the top caps: as shown in the video, their intended use is to be sandwiched between the clamps and your arm cups. They are NOT REQUIRED, and the clamps will work just fine without them. Moreover, they're too thin to bear load on their own, if you attach you arm cups via the Trek P-clamps. To use them this way, you must use an M5 washer, 16mm in diameter, to support the caps. Because I don't officially endorse this use, I will not be supplying the washers. But you should be able to find something at the local hardware store pretty easily.

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