FastTT Complete Cockpit Combo: A Technical Deep Dive

What's in the Box

Price: $1,825–$1,945 depending on configuration (saving over $200 versus buying components individually)

The Complete Cockpit Combo combines FastTT's Xénos318 base bar with their 2.0 tri bar extensions, favored by professional triathletes like Grace Thek and Marta Sánchez.

Included in the kit:

• Xénos318 base bar — 400mm width, single-side-up design with a 20mm drop, natural UD carbon finish
• 2.0 tri bar extensions — available in four sizes (S, M, L, XL) and two finishes (matt or gloss black)
• Standard or extended adjustable angled risers (your choice)
• Spacers in 20mm and 10mm sizes
• Full set of M6 mounting bolts
• Integrated BTA bracket for bottle cage or top-mount hydration

This system is a true bolt-on solution, mounting directly to any standard 31.8mm stem, meaning no proprietary setup and no new frame required. This is a significant advantage — you keep your existing bike and simply transform the front end.

Shifter Compatibility

FastTT supports all three major electronic groupsets:

• Shimano Di2 / SRAM Clics
• SRAM AXS Wireless
• Campagnolo EPS

Shifters and cradles are not included, which is standard for aftermarket cockpits. If you already own compatible shifters, you're ready to go. If not, factor those into your budget. SRAM AXS Blip Cradles, for example, cost $38 through FastTT.

Real-World Performance: On the Road

Build Quality and First Impressions

The build quality is immediately apparent out of the box. The carbon layup is clean, the hardware robust, and the riser system offers satisfying adjustability — enough to fine-tune your position without frustration.

The standout feature is the ergonomic shaping of the extensions. The hand position feels natural, allowing for long efforts without numbness or wrist fatigue. The elbow pads (available in Monochrome Camo, $39) are among the most comfortable tested — a crucial detail for long hours in the aero position.

Ride Feel

On the road, the system is stiff and responsive. There's no flex or creaking under load, inspiring confidence during aggressive cornering and climbs. The aerodynamic profile is sleek — the Xénos318 base bar tucks in tightly, and the 400mm width keeps your frontal area compact.

However, there's a practical concern: the base bar's shape could potentially allow slipping if athletes over-extend their position. This brings us to an important topic.

A Note on Reach: The 60mm Rule

FastTT recommends no more than 60mm of forward reach on the extensions. This is crucial for two reasons:

1. Structural integrity — FastTT has tested for performance within this range and is transparent about the limits rather than over-promising.
2. Built-in reach — The Xénos318 base bar design already provides approximately +50mm of reach compared to conventional setups.

While 60mm of additional extension might sound conservative, you're actually getting a total forward position that's more than adequate for most athletes seeking a comfortable, aero setup. If you need extensions pushed to extreme lengths, this system may not be for you — but for most triathletes, it's more than enough.

The question of long-term durability at full extension remains: when force hits that center piece of carbon during bumps and road vibration, does the system hold firm over thousands of miles? It's a fair concern that warrants monitoring over time.

Big Kahuna Twin BTA Kit: Solving the Hydration Problem

The Long-Course Challenge

Price: $239

Anyone who's raced a full-distance triathlon in the heat knows the math: you need more fluid than a single between-the-arms bottle provides, but traditional dual-bottle setups can turn your cockpit into an aerodynamic disaster. The Big Kahuna is FastTT's answer to this problem.

What You Get

The kit uses a vertical stacking design — two bottles positioned horizontally between the arms using:

• A 130mm integrated cone tower for the bottom bottle
• An aero bottle cone for the top
• A twin stack bracket and all necessary mounting hardware

The bottles sit centered and low, and the aero-optimized profile is designed to minimize frontal drag. It's compatible with FastTT's mono and twin stack adapter plates, as well as other cockpits using 62–65mm bottle threads.

Important: Bottle cages are not included. Budget for those separately.

On-Bike Performance

The stacked design keeps weight distribution centered, meaning bike handling remains largely unaffected even with two full bottles. The cone system holds bottles securely with no rattling on rough roads, and the horizontal orientation makes it easy to grab and replace bottles without breaking your aero position.

However, a concern remains: the tower components are primarily 3D-printed. While this keeps weight down, the front end of a triathlon bike takes a beating — road vibration, rough pavement, the occasional accidental knock in transition. A machined aluminum or carbon tower would better match the premium quality of the rest of FastTT's lineup and provide more confidence in long-term durability.

It's also worth acknowledging the elephant in the room: those aero cone caps at the end of the bottle cages look an awful lot like fairings. As one forum commenter noted, now that FastTT is an official upgrade option on Quintana Roo bikes (an IRONMAN sponsor), it's unlikely anyone will challenge this under current equipment rules. But the fairing debate is real, even if the enforcement is "vibes-based."

Compatibility Note

The Big Kahuna is not compatible with the Specialized Shiv Tri mono riser model. If you're running a Shiv, verify your setup before ordering.

The $4,000 Question: Upgrade vs. New Bike

This is where the FastTT value proposition becomes most compelling. Let's use a real-world example.

Cervélo P-Series vs. P5: A Case Study

The current price difference between a top-of-the-line Cervélo P-Series and the P5 is approximately $6,000. The primary difference? The cockpit and front end. The P5's integrated system is undeniably fast and smooth — but it's also harder to travel with and more complex to maintain.

Now consider this math:

Is the FastTT setup identical to a fully integrated P5 front end? No. But it gets remarkably close for roughly one-third the price. And it comes with advantages the P5 doesn't offer: easier travel, universal stem compatibility, and the ability to move the system to a new frame if you upgrade down the road.

Who Benefits Most?

The FastTT upgrade path makes the most sense for:

• Riders on frames with standard 31.8mm stems — Quintana Roo V-PRi, Cervélo P-Series, Canyon, and many others
• Long-course athletes (70.3 and full-distance) where hydration strategy directly impacts run performance
• Owners of older TT bikes looking to modernize their cockpit without replacing the entire frame
• Aero road bike riders looking to add a proper triathlon cockpit
• Travel-heavy racers who need a system that's easier to pack and reassemble than an integrated setup

For someone already riding a top-tier integrated bike, this isn't a necessary upgrade. But for the vast majority of age-groupers and even competitive pros on non-integrated frames, the value proposition is strong.

Industry Context: FastTT's Growing Presence

From Radar Blip to Race Day Staple

FastTT's trajectory is worth noting. The brand first appeared on the reviewer's radar at the women's IRONMAN World Championship in Nice — easy to overlook initially, as new triathlon equipment brands come and go. But when they earned a legitimate spot in Kona bike counts (and were accidentally omitted, prompting a well-deserved correction), it was clear FastTT had moved beyond novelty status.

The Quintana Roo partnership is a significant milestone. Being offered as a factory upgrade option on a major triathlon bike brand validates FastTT's engineering and quality standards in a way that independent sales alone cannot.

Competitive Landscape

FastTT now sits alongside established players like Profile Design — a brand that took decades to refine its cockpit systems. That FastTT is being mentioned in the same conversation after a fraction of that time speaks to the quality of their engineering and their responsiveness to what triathletes actually need on race day.

The forum response to this review also highlights some competitive alternatives worth noting. The Culprit Adjustable BTA Riser with Dual Stack Bridge ($200) was cited as a potentially stronger and more affordable hydration option, using machined 6061 alloy with more height and angle adjustability. This kind of competition ultimately benefits athletes — and may push FastTT to address the 3D-printing concern in future iterations.

What the Community Is Saying

The forum discussion around this review revealed several recurring themes worth addressing:

On value: Some commenters questioned the price point, with one noting "$2K aerobars" as a barrier to sport growth. However, as others pointed out, this is the price for an entire cockpit system — not just extensions — and $3,000 disc wheels have been standard for over a decade. In context, the pricing is competitive for what you receive.

On the Big Kahuna's construction: Multiple users raised concerns about 3D-printed components and potential twisting when removing bottles from the tall riser stack. This appears to be partially dependent on the specific bottle cages used, but it's a valid concern that warrants attention from FastTT.

On the fairing question: The aero cones on the Big Kahuna continue to generate debate. Current IRONMAN equipment rules are inconsistently enforced in this area, and the Quintana Roo partnership likely provides additional insulation from enforcement — but it's a gray area athletes should be aware of.

The Verdict

FastTT has built something genuinely impressive here. The Complete Cockpit Combo delivers clean aerodynamic performance, long-distance comfort, and enough adjustability to accommodate a wide range of athletes and fit preferences. The build quality rivals — and in some ergonomic respects exceeds — systems from brands with decades more history.

The Big Kahuna Twin BTA Kit solves the dual-bottle hydration challenge elegantly and without significant aerodynamic compromise. The 3D-printed construction remains the one area where the product doesn't quite match the premium standard set by the rest of FastTT's lineup, but functionally it delivers.

Are they cheap? No. But when you compare the total investment of roughly $2,100 against a $6,000 premium for an integrated bike, the math favors FastTT for most athletes. You're getting a professional-grade, race-ready front end that:

• Mounts to virtually any standard-stem triathlon bike
• Offers superior adjustability to most integrated systems
• Travels more easily than proprietary cockpits
• Can follow you to your next frame

Key Takeaways

• Build quality is excellent — clean carbon, no flex, no creaking
• Ergonomics are best-in-class, particularly the elbow pads and extension shaping
• Value proposition is strong at ~$2,100 vs. ~$6,000 for an integrated upgrade
• Watch points include extension slipping at extreme positions and 3D-printed hydration components
• Compatibility is broad but verify your specific frame (Specialized Shiv excluded from Big Kahuna)

Next Steps

1. Check compatibility — Confirm your bike uses a standard 31.8mm stem
2. Get a professional bike fit — Particularly important to stay within FastTT's 60mm extension recommendation
3. Assess your racing distance — The Big Kahuna adds the most value for 70.3 and full-distance events
4. Run the numbers — Compare the FastTT upgrade cost against the price gap between your current bike and its integrated-cockpit equivalent

If you're looking to upgrade your cockpit and hydration system without buying an entirely new bike, FastTT has built a compelling case that deserves serious consideration. Visit FastTT's website to explore their compatibility guide and configure a setup for your frame.

Disclosure

Disclosure: The product reviewed was provided by FastTT at no cost. No additional compensation was received for this review.