WRENCH SCIENCE FIT SYSTEM

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The most important thing to get right when buying a bike is the fit. Thats why Wrench Science has developed the best online bike fit calculator for our website. It allows customers who live thousands of miles away to find the perfect size for their next bike.

Bike Fit System - where to begin?

For any bike fit system to work correctly, you need to be able to take accurate measurements of your body. To do this, we recommend you enlist the help of a friend who can measure and record those parts of the body which are essential to getting the perfect fitting bike.

The first question you will be asked when you click on our Fit System is what type of bike you will be buying. Whether you are looking for a racing bike, mountain bike, gravel, e-bike or commuter, each bike and riding style will impact how the bike should fit. Knowing this beforehand will help our bike fitting calculator find your best fitting bike.

Have the right tools

The tools required for recording accurate measurements are not specialized. You will simply need a tape measure, a pen, and a level or hardback book. Your assistant will then be able to help you take the measurements of everything ranging from your height and inseam to your arm length, shoulder width, trunk, forearm and lower leg length. We have provided helpful videos to explain exactly how each of these measurements should be properly taken.

Bike Fit calculator data input

Once you have recorded all the required measurements, you can input the data directly into the Wrench Science Fit System calculator on our website. In addition to the measurements you have taken, you will be asked to include your flexibility, shoe size and age. These are all important pieces of information that will allow our bike fit calculator to ascertain your ideal size.

Once you have received the results, you will be welcome to contact us and discuss the details of your bike build. Our experts will be happy to guide you through the exciting process so that you end up with the perfect bike. If you have any questions about how to use our bike fitting calculator, please feel free to reach out!

Welcome

We at Wrench Science believe bike fitting is critical to having the best cycling experience. We have the formula for the perfect bike fit. To use the WS Fit System follow the instructions and the bike fit calculator will do the rest.

You will need three tools, a tape measure, pen & a level. To insure accuracy take all measurements twice and use the average. Enjoy!

Height

In your socks or bare feet, stand with your heels and buttocks against the wall and your feet 8" apart. Set a level or hardback book on your head making sure the book is flush against the wall or that you have leveled the level and measure from the ground to the bottom of the book or level.

Sternum Notch

In your socks or bare feet, stand with your heels and buttocks against the wall and your feet 8" apart. Find the notch at the top of your ribcage/ bottom of your neck. Measure from the ground to the bottom of the sternum notch.

Arm Length

Standing with a pen in your hand make a fist with the pen coming out the bottom of your fist. Stick your arm out to the side parallel to the ground and measure from your armpit touching your ribs firmly to the centerline of the pen. (Approx. 1/3rd behind where you fingers join your palm).

Inseam

In socks or bare feet, stand with your feet 8” apart. Take a level approximately 2ft long and put it between your legs. Pull the level up with the same pressure you feel when sitting on a saddle, approximately 25lbs of pressure, and have your helper level the level and measure from the ground to the top.

A second option is to stand against a wall and place a large book with a 1" binding between your legs and firmly against the wall so that the book is at a right angle. Pull the book up against your pelvic bone with saddle pressure, approximately 25lbs, and measure from the top edge of the book to the floor.

Please note: inseam length is NOT the same as pant length. Pant length is typically 1.5-2.5 inches shorter.

Shoulder Width

Measure your shoulder width by the outside of the bony protrusions at the top of your shoulders. You want to have the tape measure running in a straight line and not wrapping around your back.

Flexibility

In your socks or bare feet, stand with your feet 8" apart and your knees locked. Bend over and see how far you can stretch based on the chart below. Please note: to take this measurement properly you want to be warmed up like you would be when riding your bike.

Trunk

For this measurements you need to be seated with your back pressed firmly against an upright surface such as a wall. Trunk length is measured from the seat you are sat on to the top of your shoulder with you sitting fully upright.

Lower Leg

For this measurement you need to be seated in your socks or bare feet. Bend your lower leg backwards to find the top of the fibula bone on the outside top of your calf muscle. Once you locate the bone move your hand around to the top of this bone. From here adjust your lower leg verticle and measure the top of your fibula bone to the ground. Repeat on other leg and take the average.

Forearm

With a pen in your hand make a fist with the pen coming out the bottom of the fist like in the arm length measurement. Put your elbow against the wall and measure from the wall to the center of the pen.

Shoe Size

Enter your cycling or street shoe size.

SAVE FIT

Enter email address to save your results.

SAVE FIT

Enter email address to save your results.

FINISH ACTIVATING YOUR ACCOUNT

This email address started a Wrench Science account previously but did not finish activation. We've sent another message to your email address. Open it and click Activate Account. We'll take it from there and don't worry we saved your fit measurements.

FIT SAVED!

Thank you! All the measurements you just took are saved to this email account. Now please goto your email to confirm and activate your account.

FIT SAVED!

Now that you know our Fit Recommendations, enter the WSLogic Bike Builder to build the bike of your dreams. Enter Bike Builder

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