The Vision Metron TFE Team Edition Extension and the updated TFE EVO Extensions have quickly become our favorite aerobar upgrade for most triathlon bikes. This post provides detailed insight into the fit and compatibility of the TFE Team extensions to help you make the most informed purchasing decision. Of course, if you find this information helpful, please consider purchasing the extensions from our site, as that directly supports our staff and business. 

Here are five reasons why these extensions have become our go-to for upgrading most triathlon bikes: 

1. Comfort: They provide a significantly larger armpad and surface area compared to most stock options.
2. Aerodynamics: They "close the gap" between the extension itself and your forearm, improving airflow at the front of the bike.
3. Weight: They are the lightest full-arm, one-piece aerobar extensions we have seen.
4. Cost: At $740, they are some of the most affordable full-arm, one-piece extensions on the market.
5. Simplicity: The most basic setup can be installed in about an hour.

UPDATE REGARDING THE TFE EVO EXTENSIONS

[Editor Note: 11/1/2025] Vision updated the original TFE Extensions, and is now producing the TFE EVO Extensions. For all practical reasons, the information provided in our original post still applies; just note that the TFE EVO Extensions were changed in two ways:

1. Armrest tilt reduced from 20° to 15°
2. Inward extension tilt increased from 4° to 20°

For Cervelo P5 owners, Vision is making an adapter plate. This is the cleanest way to mount the TFE Extensions to the P5 from our experience (see additional images at the end of this post). 

FRONT HYDRATION CONSIDERATIONS

For triathletes wishing to use a between-the-arms (BTA) bottle, a clever solution can be devised using the TriRig Universal BTA Adapter Plate in conjunction with the BTA Riser and BTA Spacer kit. We used one of the angled wedges to run the bottle in the reverse position. 

LENGTH, WIDTH, AND SIZING CONSIDERATIONS

The TFE Team extensions come in three sizes:

1. 1. 300mm "Small"
   2. 320mm "Medium"
   3. 340mm "Large"

For this post, we used the medium size. Vision measures the medium extensions at 320 mm long, measured from the back of the armrest to the base of the grip.

Another way to measure the length of the extension, which may be more meaningful for most riders, is to measure from the back of the extension to the top of the grip. Measured this way, we measure the medium extension at 380mm.

To determine your size, we simply have a client hold an 8mm or 10mm allen key at an approximate 45-degree angle. We measure from the back of the elbow to the web of the hand (where the tool exits the top of the palm). In the image below, professional triathlete and Tri Town mechanic Travis Wood measures out to 360mm, which would put him in the "small" extension. That is the size he actually uses on his Cervelo P-Series, and he finds the fit just about right. Our experimentation indicates he could also fit the medium extension if he preferred more reach.

We measured the minimum and maximum armrest width once installed on a Cervelo P5 with the EX10 pad mount. The stock Cervelo armrests can be set to a minimum width of 12cm (measured center-to-center of armrest), and a maximum width of 22cm. The twelve mounting holes on the Metron TFE Team extensions provide the same 12cm to 22cm measured center-to-center range.

The armrest pads and the carbon fiber support area are identical across all three sizes. The walls of the armrest support measure 11 cm across, and the outside walls are approximately 5.5cm tall, measured from the highest point of the wall to the center of the armrest pad (image below).

The back of the armrest to the tip of the extension grip rises approximately 15cm in the medium size.

As a point of reference, here is a stock 2024 Cervelo P5 Disc with one stock extension installed on the left, and a Vision Metron TFE Team extension on the right:

WEIGHT CONSIDERATIONS

We found the TFE Team extensions to weigh slightly more than the weight posted on the FSA/Vision website. Nonetheless, these are the lightest full-arm, one-piece extensions we have come across. The extension weights are posted below, with the "full system" weight including velcro, pads, bolts, and cyclometer mount in parentheses.

1. Small pair: 422g (546g)
2. Medium pair: 475g (599g) (shown below)
3. Large pair: (not yet available)

INSTALLATION CONSIDERATIONS

These are some of the most forward and simple extensions to install. They are Shimano Di2 or SRAM AXS (wired Blips are okay) specific, and we are not aware of a good way to run mechanical derailleur cables through the extensions, though with some creativity it could theoretically be possible.

Two M5 bolts with conical washers mount the extensions to your armrest support. The bolt spacing is 1.5cm (exactly the same as found on the stock Cervelo P5 EX10 extension and pad mount). There are a total of 12 mounting holes, and half these holes are drilled in an oval pattern to provide some bolt spacing flexibility.

Di2 or SRAM Blip wires run straight through the extension, with a generous exit holes. We typically use a standard derailleur cable with a brake ferrule on the end to pull a Di2 cable through.

A rubber spacer fills the gap for the mounting plate and hardware. This rubber spacer also has a few grooves to hold your Di2 or Blip wire.

This all fits in nicely, and the extension has a relief groove in it to remove any chance of your electronic wire being pinched under weight. The armrest pad holds the rubber spacer in securely.

Travis is a mechanic at our shop and a pro triathlete who uses the Vision TFE Team extensions on his LTD edition Cervelo P-Series. He pairs the extensions with the Vision Metron pad mount and a Profile Design base bar.

From the front, the extensions blend well with the rest of the bike.

A photo from the rear shows the clean setup when paired with SRAM AXS Wireless Blips.

Lastly, here are 45-degree angle photos from both the front.

IMAGES OF THE VISION TFE EVO EXTENSIONS W/ CERVELO P5 ADAPTER PLATE

[11/1/25] Vision has released an adapter plate to integrate the TFE Extensions with the Cervelo P5 Disc cleanly. We love this add-on, and it is now our go-to adapter for the P5 Disc.