Sizing yourself for a bike is one of the most important things to do before purchasing a bike. You don't want the bike to be too large or small for you to ride comfortably!
Also, check out this Biktrix Live video discussing sizing yourself for an eBike.
Step 1: Measure your inseam
The most important measurement to take when sizing yourself for a bike is your inseam length. This is essentially the inside length of your pant leg from crotch to floor. We don't want you to base this simply on your pants size - this is the primary measurement used to calculate your best-fitting bike. Here is how to most accurately measure your inseam length:
Stand with your back against the wall
Spread your feet 6-8" apart on a hard, smooth surface
Place a book between your legs and up against the wall with the spine of the book facing upwards.
Raise the book up until it is snug against your crotch (this mimics the bike seat).
Have another person measure from the top of the book (the spine) down to the floor. This measurement is your inseam length.
The image below illustrates just what is meant by "Inseam Length".
Step 2: Using your inseam measurement with bike measurements
Now that you have the inseam measurement the next step is looking at the measurements on the bike pages. The most important ones are the "Standover Height" and "Min/Max Seat Height" as these are most applicable to fit onto your bike.
Standover Height: This is the measurement of the lowest part of the bike where you will have to mount to stand over the bike. Generally, you would like this measurement to be at least 1"/25mm less than your inseam length. This will allow for you to stand flat-footed on the ground with one leg to either side of the standover when stopped.
Min/Max Seat Height: This measurement describes the highest and lowest level the seat can go from the ground to the top sitting surface of the seat. Generally, the ideal seat/saddle height is 4"-6"/100-150mm taller than your inseam length. You might need to look at this differently depending on being a tall or short person.
Ideally, the minimum saddle height shouldn't be at the top of your ideal saddle height measurement, it could be too tall. Having some extra room to adjust your saddle down and up will help ensure your ride is comfortable.
A tall person needs to look at the Max Seat Height. You want to make sure your inseam is within 4"-6"/100-150 of the Max Seat Height. If you need more height on a bike consider getting a Thudbuster seat post - this can add 4"-6"/100-150 to your maximum seat height.
A short person needs to look at the Min Seat height. You want to make sure your inseam is approximately 6"/152mm higher than the Min Seat Height stated. You may also want to use a Thudbuster seat height to make this work better for yourself.
Note that these measurements aren't an exact science - some bodies are longer or shorter than others.
Saddle Height: In order to prevent stress injuries to your legs and knees, it's important to position your saddle to the correct height for maximum leg extension on the down stroke. You want to just have your tip toes touching the ground when you're seated on your saddle. When standing flat-footed on the ground with the bike between your legs, your saddle should be positioned just above the bum.
Look at these images below for references on bike fitting:
With this information, you can find a bike that will best fit you. If you have any more questions about bike fit feel free to Contact Support with your inseam measurement and they can help you find a bike that will best fit you!