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San Diego Bike Fitting

Bicycles are symmetrical, humans are not.

We believe that a bike that fits you properly is the best kind of bike for you. Whether you ride short distances or long, on road or off, a riding experience that is comfortable and pain free is achievable with the proper bike fit. Using the most comprehensive and technologically advanced tools in the industry, we'll help you become one with your bicycle.

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What you'll get from a professional bike fit

Our fit practices are based on industry leading methodology to generate optimal performance and efficiency for all cyclist disciplines. 

A proper bicycle fit is transformative in terms of comfort, efficiency, and power output. Every fit is conducted with attention to detail yielding a holistic and dynamic result. Ultimately, each cyclist appreciates real gains in performance, health, comfort and enjoyment regardless of the individual's experience or style or type of bike they ride as a result of a correctly executed fit. 

A professional bike fit is the true foundation for providing a more pain-free, efficient and enduring experience on your bike providing the tools to achieve the individual's goals on the bike. 

Simply put, a proper bike fitting has the effect of making you forget about the bike and allow you to focus on the ride.

Schedule Your Fit

Have a question about bike fit? Email us at

By scheduling your fit appointment, you are agreeing to the terms of our cancellation policy. Please read before booking.

Explore The Retül Process

The Retül Fit Process video is a great overview on how we'll approach your bike fit, but be sure to keep scrolling for even more info.


Retül Fit makes riding more enjoyable by making you more efficient while reducing the chance of injury and increasing comfort on the bike.

Increased Comfort

No matter your level of riding, comfort is crucial for sustaining time spent on the bike.

Injury Prevention

The correct position on the bike keeps your body aligned on the bike, helping to prevent injuries.


An optimal position not only increases comfort - it maximizes both power and endurance.


Using Vantage 3D motion capture technology, the Retül system accurately measures every degree of movement and millimeter of distance providing you and the fitter with data to support the choices made during the fit process.


Data is collected in real-time while you pedal providing the most accurate details of your riding position.


Learn more about your body, the root cause of your aches and pains, and how a proper fit will help you achieve your cycling goals.

Data Driven

Supports the decisions made by the rider and fitter for cycling equipment and riding experience.


Step 1:

Starting with a pre-fit physical assessment, your fitter will take into account your body’s limitations, previous injuries and pains, and what your goals are on the bike.


From there, the fitter will have you get on the bike (either your existing bike or fit bike) to place LED markers on 8 anatomical points of your body which will be tracked by the Retül Vantage Motion Capture system.

Step 3:

Data is compiled into the Retül fit software so that the fitter can look at the numbers and make adjustments to your bike based on the fit data, pre-fit physical assessment findings and your goals on the bike. This also may include any equipment changes, such as saddle, shoes, and footbeds.


The fitter will create a digital map of your final bike set up using the Retül Zin tool. The bike data and Zin tool measurements are generated into a complete report that you can reference at any time.


Retül Fit


2.5 hours

(Road, Cyclocross, MTB, & Fitness)

Retül Aero Fit


3 hours

(Triathlon & Time Trial)

*Aero fits are more complex and require more time with a professional fitter.

Comprehensive Fit


1 hours

(All bike types)

Bike Sizing

FREE with Bike Purchase

15 minutes

(All bike types)


Q: What is Body Geometry Fit?

The tailored suit of bicycle fitting. Any rider who is looking to ride longer, faster, in greater comfort and with less risk of injury can benefit from a Body Geometry Fitting. During your fitting, your certified fit specialist will learn about how you ride, your cycling goals, and other pertinent information to understand your needs as a rider. Next, we will take you through a 22-step physical assessment to help guide the customization of your bike position. Once on the bicycle, we assess the way that you ride and optimize the position using Retül technology and make it a complete, tailored bike position. In the end, saddle selection and position, shoes, footbeds, cleat position, and handlebar position are all optimized to your body.

Q: What is Retül?

Retül is our 3D analysis system that allows us to better tailor the bike to you. LED markers are strategically placed on eight anatomical points of the rider: the wrist, elbow, shoulder, hip, knee, ankle, heel, and toe. As the rider pedals, Retül's sensor bar gathers real-time, three-dimensional data of the rider's pedal strokes and movements. The rider's data is compiled into a reader-friendly report for analysis by the fitter. The fitter can then assess the rider's position and make necessary adjustments. The Zin, Retül's handheld digitizer, allows the fitter to digitally measure the rider's bike at 13-15 points, depending on the bike. The Zin can measure fixed points, contours, and curves, and provides a complete digital map of the bike.

Q: What's the difference between a “Fitting” and a “Sizing”?

A fitting will allow for a custom tailored position on your bike. Taking into account the unique and subtle biomechanical nuances of your riding position and solving basic and complex issues alike, a fitting will cover every aspect of your relationship with your bike. It will address any equipment or position related ailments, and optimize your position for comfort, efficiency, and power. A sizing typically refers to an industry neutral setup. A sizing will take you through some of the basics of bike positioning while using averages. A sizing typically does not take into account most of the rider specific considerations (such as flexibility, knee tracking, and core strength).

Q: Which service do I need?

We believe that every cyclist can benefit from a professional fit, but we also realize there are bank accounts, significant others, and various life things to be taken into account. Typically, if you are running into more complex issues such as knee pain, inconsistent or asymmetrical saddle issues, or numbness issues, then a fitting is truly more appropriate. This will allow your fit specialist to find the root cause of the issue(s) and put appropriate solutions into place. If your questions and concerns are more basic, a sizing may offer everything you are looking for. If you have any questions on this before signing up for a service, please contact any one of our fitters.

Q: I’m not a racer. Should I get the Body Geometry Fit?

Any type of rider can benefit from the Body Geometry Fit! Whether you're riding on your local group ride or just getting back into riding after years away from the bike, no one should ride in pain. If you want to be more comfortable on the bike and be as injury preventative as possible, then the Body Geometry Fit is a great option for you.

Q: Who uses Body Geometry Fitting process?

Some of the biggest names and teams in all disciplines of cycling use the Body Geometry Fit process. Some heavy hitters include World Champion Peter Sagan and the entire Bora-Hansgrohe team, Marcel Kittel and Quick-Step Floors, World Champion Amalie Dideriksen, and U.S. National Road Race Champion Megan Guarnier of Boels-Dolmans. Professional triathletes Gwen Jorgensen, Ben Hoffman, and Javier Gomez. Mountain bikers Kate Courtney, Annika Langvad, and Simon Andreassen. Check out the complete list of riders and teams at S-Racing.

Q: Is cleat fitting part of the Body Geometry Fitting process?

Yes! We refer to our cleat portion of the fitting as “z-plane” analysis. As we assess rider position, our z-plane analysis not only takes into account knee tracking as a result of cleat adjustment, but also takes into account rider rotations on the saddle, which can create abnormal knee, hip, and upper body positioning.

Q: What should I bring with me to a bike fit?

Please bring the following items to your session • Your bike – During your session your bike will be placed in a trainer to allow for your cycling biomechanics to be recreated inside the studio • Your shoes - If you do not have shoes or want to purchase new shoes prior to your fit, please allow extra time before your scheduled appointment • Your pedals - we stock cleats for most pedal systems should your cleats need replacing • Cycling shorts or tri suit - these need to fit well to ensure we can take accurate measurements • Jersey or base layer - we need to be able to see your shoulders for the most accurate measurement • Helmet – In particular instances we may want your Triathlon/TT helmet • Headwear and Sunglasses - In some cases, something as simple as the bill on your cycling cap or the rim on the top of your sunglasses may be leading to that nagging neck pain. • Proprietary parts - If your bike has any kind of "integrated" stem, seat post, or tri bar set up, please bring all spacers and fittings provided with the bike. *Please also check stem bolts, seat post, saddle clamps and seat post clamps for corrosion prior to your fit to ensure that these parts can be easily adjusted during the fit process.

Q: It’s the day of my fitting. What do I do?

Please arrive 15-20 minutes early in order to give yourself ample time to find parking, change clothing if needed, and bring your equipment into the store. During the summer our fit appointments book incredibly tightly so please do arrive on time. If you are more than 15 minutes late, you may be subject to reschedule.

Q: Can I ride my bike to my session?

Yes! If it’s inclement weather, please try and dry off a bit by the door on the way to the studio.

Q: Do you stock stems of different lengths and size?

Absolutely! While we hope to carry all of your needs on hand, on occasion we do need to special order a part that is required for your position. We apologize for any delay in getting you back on your bike.

Q: Do you offer test saddles?

Unfortunately no. Each of our studios are stocked with a wide variety of saddles for purchase. While we don’t have a test saddle program, our fit specialists will work with you with our sit bone measuring equipment and on hand product in order to find the perfect saddle solution. We have a 30-day refund policy on any product that you and your fit specialist decide on during your session.

Q: Other shops don't charge for a bike fitting. Why do you?

In order to promote the experience we believe all riders should be able to enjoy, we are proud to employ a dedicated full time staff of Certified Master Fit Specialists. This staff represents the most knowledgeable, thorough, and professional fit personnel in the industry today. All of our fit professionals have been trained and certified by Specialized and The Boulder Center for Sports Medicine, and will offer the most up-to-date methods and solutions found in the cycling world today. What does that mean for you? It means solutions instead of theories, proven technology, thoughtful support on your position, and a decreased wait time to get in for your service.

Q: Should I get a new fit every year?

As your biomechanics change, as your weight varies, as your strength grows and fades, your position on the bike is subject to change. Re-evaluating your position on a yearly basis is a great idea to consider if you are serious about your cycling ventures.

Q: Will a bike fit make me faster?

Possibly! While we really want to say everyone will get faster through a fitting, it will completely depend on where you are currently with your bike position and fitting experience and how much your position changes during the service.

Q: What types of bike do you fit?

We fit nearly all kinds of bikes including road, MTB, fitness, cyclocross, triathlon, and time trial bikes.

Q: I have an injury. Will your bike fit fix it?

While bike fit is incredibly important to not aggravate or exacerbate current injuries or cause repetitive motion injuries, it’s probably not going to cure you. Unless your doctor says, ”go ride a bike, it’s going to cure that heart ailment, weight issue, etc.” Then, we say listen to your doctor!

Q: What if I bought my bike elsewhere?

No problem! We fit all types of bikes from any vendor. If you have a specific seat post or stem that is proprietary to a manufacturer, please do make sure and bring all required pieces as our relationships limit some of our ability to order small parts from all vendors.

Q: What if it turns out that the bike I have doesn't fit?

On occasion, we do run into a bike that is too far from a sound position that it may not make sense to invest any further into that particular bike. In these cases, your fit specialist will either work with you to find a reasonable solution on your current bike or recommend you work with one of our knowledgeable team members to find that perfect fitting new ride.

Q: I had a bike fit from you and something isn't right, what should I do?

With the purchase of the Body Geometry Fit, you also receive a full year of complimentary follow-ups! This allows us to adjust the position as needed as you start to ride your bike after your fitting.

Q: Thinking about getting new equipment during your fit appointment?

Great! Your fitter can help you find all the new equipment that you need. Because our fitters can have multiple appointments in the day, we highly recommend that you reach out to your scheduled fitter to set some extra time aside for this process.

Q: What is your cancellation policy?

We very much dislike having to charge for no-shows and cancellations, but they can be extremely costly to us. If you need to reschedule, no problem - just try and give us ample notice. During our busy season, our fit specialists see many clients each day. In order to keep our wait times down and to avoid using up other’s paid appointment time, please arrive 15-20 minutes early. If you are more than 15 minutes late you may be subject to reschedule. By making a booking you are accepting the terms of our cancellation policy. We currently ask for CC information to schedule any of our bike fit appointments. If you do need to cancel or reschedule your appointment, our policy is as follows: Less than 48 hour cancellation - 25% No Show - 50% Less than 24 hour reschedule – 15% (at our discretion) More than 15 minutes Late – Reschedule (at our discretion)

About Aaron Hauck

Professional Bike Fitter at Black Mountain Bicycles

As a lifelong athlete across a variety of sport disciplines, I naturally gravitated to the field of exercise science. I obtained my degree in exercise science at the University of Arizona and was fortunate to work as an adjunct coaching staff in many of the sports programs on campus. Following my formative college years, I continued to work in my community assisting vulnerable clients with physical rehab, furthering my understanding on human mechanics and functioning of the body.

As my personal interests veered back to my childhood admiration for cycling, so did my quest for learning. I availed myself to several bicycle fit theories which complimented my knowledge base in exercise science enabling me to provide top quality, science backed bicycle fits to my clients.

Today, I have amassed 25 years of experience in the field of exercise science. My education and practical experience, through its application, compliment my uniquely acquired fine-tuned understanding of human movement. As a cyclist, I appreciate the importance of a professional bicycle fit.

When opportunities arise, I enjoy presenting informational seminars to help educate athletes (cyclists of all levels), on the importance of ergonomics and efficiency. I strive to serve as a powerful advocate in educating individuals on how they can set themselves up for success to achieve their ultimate goals.

The personal and educational training and experience I bring to the table is unique. I have acquired the skillset of identifying skeletal discrepancies and/or soft tissue issues, which is important to address in a bicycle fitting as those issues often cause imbalances and discomfort on the bike.

Ultimately I truly enjoy bridging the gap for individuals through a top notch bike fit. A proper bike fit is one more tool in the belt for my clients to achieve their ultimate cycling goals even when the goal is simply to live a healthier and happier lifestyle.

There is a personal fulfillment gained when I follow up with my clients and they are experiencing a level of comfort they didn't realize they could have prior to their fit and finding products that work with them, not against their body makeup.