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In-between Bike Sizes – How to Choose When You Fall Between Two Size Groups

between two bike sizes

At least 15% of bike buyers fall into two bike sizes

So, which one should you go for?

Sizing down = better maneuverability
Sizing up = better stability

Due to the accessibility and the large variety of bikes in the market, buying a bicycle online has now become more popular than ever.

A new bike is a big investment financially, therefore it is wise to ensure you’re making the right choice before you make the purchase.

While the bike size is not the only thing that will determine the success of your new bicycle purchase, finding the perfect fit will improve your overall cycling experience as well. When you ride on the right size bike that is adjusted to fit your body, you help prevent injuries, ride more efficiently, and feel comfortable for longer durations.

Back, knee, and wrist pain are common when your bike is too big or too small mainly due to uneven distribution of bodyweight and overreaching.

different types of bicycle frames

Each bike brand has its own size-recommendation chart which is generally based on a person’s height range. For road bikes, leg inseam, reach and stack play a bigger role.

How are bike sizes market?

Generally, each bike brand has its bicycle frame size recommendations lined up in sizes like Small, Medium, Large and Extra Large. Most of the time, the largest recommendation for a size small is the lowest for the size medium.

So, how to know which one to take?

  • Mountain Bike Sizes – XXS, XS, S, M, L, XL, XXL, XXXL
  • *Road Bike Sizes – 48cm, 50cm, 52cm, 54cm, 56cm, 58cm, 60cm, 62cm, 62cm
  • Hybrid, City bikes – S, M, L, XL
  • Cruiser bikes – One Size, 26″ (Size of the wheel)

*Choosing a bike frame comes down to three factorsLeg length, inseam length, and also the reach of the bike.

How To Choose – Body Preferences & Bike Size

What Size Bike For In-Between Bicycle Frame Size?

Long torso = Larger frame
Long hands = Larger frame
Long legs = Shorter frame

Short torso = Shorter framer
Short hands = Shorter frame
Shorter legs = Longer frame

*Find out how to measure down below


Quick Answer

Get a Size Smaller!

Shorter bike = Shorter wheelbase = More agile, nimble, and playful

CHOOSE IF you are into technical riding. 🏆

Best for cornering

Best for technical riding

Best for a person with a short torso or long legs

Get a Size Larger!

Larger bike = Longer wheelbase = Better stability on higher speeds

CHOOSE IF you prefer better stability on higher speeds over the technical aspect. 🏆

More stability on higher-speeds

Prefer more straightforwards trails

Best for cyclist with tall torso or tall back


In-Between Bike Size – How To Choose?

– Should You Go Size Up or Down?


5’2″ / 5’4″ and 6’0″ fall in-between two sizes, while a 5’4″ cyclist in this case also faces choosing between two completely different wheel sizes.  Different characteristics of wheel sizes are quite similar to the differences in frame sizes, too.




How does it work?
6 things to note before making your decision


1. Find your arm span to height ratio – The Ape Index

Measure the distance between your fingertips with your arms held out shoulder height, palms facing down, and shoulder blades down and back in a ‘neutral’ position.

This measurement is sometimes referred to as the ‘Ape Index’.

Compare this number in inches to your height in inches.

If your wingspan number is greater than your height, it may be preferable to choose the larger size frame when you fall between sizes.

If your arm span is smaller, the smaller frame may suit you better.


2. Get Your Leg Inseam Measurement

Stand with your back to the wall with no shoes. Put a hardcover book between your legs, up against the wall, and pressed firmly up into your crotch. Measure from the ground up to the mark.


3. Long vs short torso – which do you have?

*When you have long torso
To measure your torso length – 1.Sit on a chair by the wall 2. Place a book on the wall and measure from the chair to thebook mark’. If that is over half of your body height you have a long torso.


4. Do The Toe Touch Test

Slowly bend over with your legs locked out, and try to reach your toes.

If you can, you may prefer a longer head tube (larger frame), if not you can choose the smaller one, or work on your mobility.

While this test is rudimentary, when you consider it in the context of the other measurements, it is useful.


5. Go For a Test Ride

Regardless of whether you are between sizes or not, you should always take a bike for a test ride before making the purchase if you have the opportunity.

This is even more relevant if you are unsure about the fit.

If you are purchasing online, try to find the bike or a model with similar measurements at a local bike shop before you do.


6. Ask For a Recommendation

Whether you are planning on getting the bike from your local bike shop or from Craigslist, feel free to ask around about the fit of this specific brand or model.

bicycle rear brake in macro


What size bike should I buy when I’m between sizes?

The question depends mainly on these few things –

  • Personal preferences and feel of the bike.
  • Level of flexibility
  • Bodily measurements
    1. Leg length
    2. Arms length (wingspan-to-height ratio)
    3. Torso & back length
  • Bike frame measurements – top tube length, seat tube length


hybrid bike size chart

What if you are either 5’6″, 5’9″ or 6’0″?


How to measure bike frame size?

Bike frame size is usually determined either by the:

  1. Distance from the center of the bottom bracket to the top of the seat tube.
  2. Some manufacturers measure from the center of the bottom bracket to where the top tube meets the seat tube.

The length of the top tube is another key measurement to consider that isn’t factored into the bike size. This measurement will indicate how much you will have to stretch to reach the handlebars (adding a longer handlebar stem is a way of tackling a short top tube).

What measurements are used to size bicycles?

Hybrid, City, Electric and Mountain bikes are usually labeled in sizes like XS, S (Small), M (Medium), L (Large) XL (Extra-Large). You’ll see the occasional XXS and XXL mountain bike frames as well

Road bikes are generally measured in centimeters (cm) – 56cm, 58cm, 60cm which indicates the length of the seat tube.

Cruiser bikes have sizes marked in wheel sizes such as 24″ or 26″




How to Compensate for the Incorrect Bike Size?

Bikes are adjustable to a fine degree in a number of ways.

This means that even though bike sizes are fixed, you can still tailor the bike to suit your body and preferences. These are the main components that can be changed:

  • The seat post can be raised or lowered
  • Handlebars can be raised or lowered
  • The saddle can be moved forwards or backward
  • The handlebar stem length can be changed
  • Handlebar width can even be adjusted or changed

It’s worth noting that two distinct bike sizes may fit any one person due to the overlap and their ability to adjust. With all the measurements we mention, along with knowing preference and flexibility, you will have all you need in order to choose the size that you will enjoy riding the most.





Making a bicycle purchase is a big decision that requires thought and patience. Finding the right size can be difficult if you are between sizes. However, if you follow the advice in this article, you will put yourself in the best position to make the right choice.

It’s worth noting that having a local bike shop with a good reputation is extremely valuable. Take advantage of test rides, professional knowledge, and in-person customer service to help find the perfect bike for you.


Images Courtesy: Pexels.com



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One thought on “In-between Bike Sizes – How to Choose When You Fall Between Two Size Groups

  1. Larry Hull says:

    The size articles are extremely helpful. I’ve discovered that a Pacific Scorpio I purchased approximately 20 years ago, sizing by the seat of my pants, was the right size. It’s been dormant for the past ten years. I just had a tune-up,new tubes,etc. And nearing 80 years old, I’m going to start using it again as an exercise device.

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