Aero Bike Fit Specialists

The Right Aero Bike Fit for YOU – Guaranteed

We have been competing for more than 20 years, and as Engineers have studied and experimented with bike fit from day one. We have created our own fit protocols, philosophy, and tools, including our patented automated fitbike. We pioneered online fitting.  We focus on aero – triathlon and time trial – bike fitting. We do road bike fits too, but aero is our heart and soul.  Thousands of happy clients and countless victories later, we still keep learning and honing our craft every day.

We stand behind and have pride in our work. It actually matters to us that our services help YOU have the best athletic experience possible. Looking for the right tri bike? We will find it for you. If you have a bike already we will make sure your fit is optimized. Either way, you will LOVE your bike. That is our money-back pledge. If something isn’t right, we will fix it or give you a full refund on any and all fitting charges. No bull. Please talk to any of our thousands of customers. Talk to the coaches who send us their athletes. We look forward to working with you.




Motion Analysis Bike Fitting

Aero and Road

Aero and Road

Visit us in out fit studio in Warren, RI for a comprehensive fit session. We use digital video motion analysis, Spin Scan, our proprietary automated Vertex Fit Cycle, and a rotating fit platform along with out decades of experience as competitors and fitters to ensure the best outcome for you.


Online Bike Fitting

Aero and Road

Aero and Road

Can’t visit us in person? Send us a video and we will use the same digital video motion analysis we use in-house to give you a great bike fit. We will send back a narrated video explaining what you need to change, and go back and forth until you are satisfied. 


Prebuy Fitting - In Person or Online

Aero and Road

Aero and Road

Planning to invest in a new bike? Don’t make an expensive mistake – make sure you get a bike that works best for YOUR fit. Visit us in RI and we will put you on the Vertex Fit Cycle, dial in your fit, and provide a list of specific bikes and sizes that will fit you well. No bias – you get a list of all appropriate bikes. Looking for a “Super Bike”? We have proprietary calculators that determine the exact configuration that works for your fit – no guesswork – build the bike right the first time.  And yes – we also can do this online via video, even if you don’t have a tri bike. 


Bike Sales and Custom Builds

Aero and Road

Aero and Road

While we are first and foremost fitters, we do sell and custom build bikes. Or we will customize your bike for the fit and performance you are looking for. Extensive experience with electronic shifting conversions and builds. 


PRO: Bike Fit Systems and Services

Our Own Designs

Our Own Designs

We have created our own patented, automated Vertex Fit Cycle and fit systems. Soon we will be making our designs available to shops, fitters, coaches and training centers. Want to get a bike fit certification? Well, we don’t believe you can become a fitter in two days. But look for comprehensive fitting apprenticeship programs coming soon. We are accepting indications of interest now. Note that applicants will need to be accepted into this program based on background and technical ability. 


PRO: Consulting Services

Product and Fit

If you are a firm that produces bicycle components or frames, and would like a fitter/engineer’s assistance with geometry and ergonomics, please




What Do Our Clients Say?

  • meganPSLice1

    Meg Pennington – Custom bike builds and fitting

    “I wanted to thank you for such an amazing build and fit you did with my Cannondale!! I truly had an absolute blast riding it at the Lake Placid Ironman – and I’m excited to tackle the distance again to apply what I learned. I would not have had such a successful first Ironman without your incredible talent getting such a good fit!!”

  • marceves

    Marc Eves – in-person Fit on Vertex Fit Cycle

    My fitting from last fall won the bike leg in my age group at Ironman Lake Placid, and placed 3rd in my age group to qualify for Kona! Thanks for the fit!
    See you in hawaii! – in-person Fit on Vertex Fit Cycle

  • patMcCrannIMTX

    Pat McCrann, Endurance Nation – Multiple in-person fits, custom bike build

    Can’t say enough good things about what you have done for my bike fit and overall performance. Hard to believe you can keep finding more speed for me…thanks!!! (2015 IMTX 5th overall amateur, 4:44 bike split) – Pat McCrann, Endurance Nation – Multiple in-person fits, custom bike build

  • ECole

    EC – In-person Fit

    I wanted to send you an email just to let you know how GREAT my “new” bike (fit) is! I rode over 100 miles on it last weekend, after the fit, and felt so strong and comfortable. I’m so shocked how effortless the power and speed are now (especially when I’m in aero). And, I’m actually climbing better too! I raced the Cedar Lake Triathlon (a local super sprint that takes place every other Thursday night through the Summer) and I actually PRd the bike course and felt fantastic coming off the bike and onto the run!
    You have a gift. THANK YOU, THANK YOU! – EC – In-person Fit

  • NeilWbike

    NW – Multiple in-person fits and custom Kestrels

    “Just wanted to say thanks for selling me another great bike!

    My new Kestrel worked great in St. Croix and I got another Kona spot, despite a very choppy swim, strong winds on the bike and heat on the run. For me, it’s still all about the bike”. – NW – Multiple in-person fits and custom Kestrels

The Vertex Fit Cycle by TTBikeFit – Available January 2017

We developed and patented the Vertex Fit Cycle because we could not find a satisfactory fit platform on the market. Frankly, we cannot imagine fitting without this amazing machine. The Vertex is the ONLY fitbike that keeps the rider stationary and move the contact points around the rider. This allows us to easily change one fit variable while keeping other variable constant. Traditional fitbike designs cannot do this since the saddle and rider move. After working with our production prototype (shown in the lower 2 videos) for 2 years in our studio, we are finally ready to release the production version (top video). We plan to sell initially very limited numbers of the Vertex to select fitters, coaches, and teams. Please contact us if interested.


Our YouTube Channel has millions of views! Some Favorite Videos:

Next year I age up to older THAN shit ... See MoreSee Less

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If you travel 6000 Km (3700 miles) for a new bike, it better be good! Our friend and ironguides athlete Stefano picked up his custom Ventum One today - custom built and fit on the Vertex Fit Cycle- on his way from Lima, Peru to Syracuse 70.3 . ... See MoreSee Less

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Amazing feedback on Argon 18 Nitrogen aero road bike - I have 2 of them out in the wild and it seems like a fantastic bike from these reviews. I guess the fitting was ok too...

"To begin, the bike is very fast, on a flat road, in an aero tuck, the bike just hauls. It really feels like every pedal stroke goes right to the wheels and it feels super slippery in the wind. For an “aero road” bike it climbs remarkably well, Finally, it handles like it’s on rails, it is stable and corners very well. If I compare it to my other “aero road” bike - my Cervelo S3 - I would have to say it is much more nimble and climbs much better. The S3 is also a fast bike but to me it always felt a little “clunky” and “heavy” - it didn’t climb well at all, hammering up a hill the beck end of the bike felt kind of mushy (compared to a Cervelo R5 (a climbing bike) where the back end felt like it wanted to propel you forward on a climb) and I never felt like it handled and cornered all that well. it always felt kind of “cumbersome” to me. None of that with the Nitrogen.

By the way, you reallly nailed the fit - bike fit like a glove from the first moment I sat on it. " - FR

"It's such a great bike - handles beautifully and is so responsive and quick, but I feel very solid on it. It's a comfortable ride and I've had no problems with the brakes. I've taken it out four times so far on rides from 18 -34 miles on a variety of long uphills, flats and curvy downhills, and I love it more every time I ride it. The thing I think that is making the biggest difference for me though is the fit of the bike - it's amazing. I feel so much better being lower on the bike, I'm more comfortable, feel like I have better control on the bike and more power. It's at least a 1000% improvement. It fits me so perfectly. I can't thank you enough for your expertise, and taking the time to find the perfect riding position and bike for me. I will definitely be back when I am ready to buy a tri bike." - KD
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Another Ventum One getting ready to hatch - custom build with Enve bars ... See MoreSee Less

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