Adults Bike Size Guide

Find Out What Size Bike You Need

If you're looking for a new bike but find yourself asking 'What size bike do I need?' then look no further! We've pulled together an easy to use bike size calculator which will help you find the right frame size for you based on your height, inside leg measurement and the type of bike you're interested in.

Like doing things the old fashioned way? No problem! We've also listed out all of our bike size charts which show bike frame sizes by category. These charts are great if you've not decided exactly which bike model you're looking for but if you're looking for something a bit more specific then take a look at our product pages, each of our models has it's own bike size chart to make sure you get the perfect fit. You’ll know which size bike you need in less than a minute... It's really that easy!

Calculate Your Bike Size


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How are bikes measured?

Bikes are measured by their seat tube length. This measurement is normally from the centre of the bottom bracket or the centre of the bolt that attached the crank arms. Bike frame sizes are most commonly measured in inches however certain types of bikes, particularly road bikes, are measured in centimetres as standard.

Does it matter which bike frame size I choose?

Choosing the right sized bike depends on the type of bike, your height, inside leg measurement and your riding style. A correctly fitting bike will be more comfortable, more efficient and more fun to ride allowing you to go further for longer. The type of bike that you buy will have a significant impact on the frame size that you need, for example, it is possible for a person buying a classic bike to need a 17” frame size in that style but to need a 14” frame size in an urban bike. Our bike size charts provide you with a general guide to sizes for each bike type to give you an idea of which size to choose. For model-specific information just take a look at the individual size chars on our product pages.

How do I measure myself for a bike?

The most accurate measurement to determine which size bike you need is your inside leg measurement.  To get this measurement simply stand against a wall with your feet flat on the floor without shoes on and place a book between your legs as high as is comfortable, next measure the distance between the top of the book and the floor. If you don’t have this measurement to hand then we’ve matched leg measurements to their average height and you can use this value instead.

If you find that you’re between sizes or you’re unsure of which of two frame sizes would suit you best then other factors that can be considered are your cycling confidence level and your reach.  If your cycling confidence level is low or you’re getting back on your bike after a long break you may find it easier to choose the smaller of the two sizes as this is likely to allow the balls of your feet to rest comfortably on the floor whilst you’re sitting on the bike.  To find out if you have short or long reach you will need to measure your arm span against your height.  To do this, stand against a wall to gauge your height and place the tip of your fingers level with your height.  Next try to touch the floor using the tips of your fingers on the other hand if you cannot touch the floor then you have a shorter than average reach and may be more comfortable with the smaller size.

What happens if my new bike is the wrong size when it arrives?

We know that mistakes can happen and it’s important that your new bike is a perfect fit, so that’s why we offer Free 14 Day Returns on all of our products sold online.  If your bike isn’t the right size for you just let us know and we can arrange to collect it from you free of charge.*

Urban Bikes Size Guide

Our stylish urban bikes are popular for weekday commutes and weekend adventures; you can use our urban bike sizing chart below to find the perfect fit for you. Our urban bikes are available in a wide variety of bicycle frame sizes to suit a range of different heights and also come in a choice of frame style. Urban bike frame sizes are measured in inches and you’ll be able to choose between a crossbar or open frame design which will affect the size of bike you’ll need.
Alternatively try our handy bike frame size calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full urban bike range while you’re here?

Leisure Bikes Size Guide

Comfort and function are at the forefront of our Leisure bike designs, so if it’s a smooth ride you’re after with sophisticated styling then look no further. Our Leisure bikes are available in a wide variety of bicycle frame sizes to suit a range of different heights and also come in a choice of frame style; you can use our Leisure bike sizing chart below to find the perfect fit for you. Leisure bike frame sizes are measured in inches and you’ll be able to choose between a crossbar or open frame design which will affect the size of bike you’ll need.

Alternatively use our handy bike fitting calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full leisure bike range while you’re here?

Mountain Bikes Size Guide

It’s time to take the road less travelled with our range of mountain bikes; explore off-road and free your inner adventurer. Our mountain bikes are measured in inches and are available in a wide variety of bicycle frame sizes to suit a range of different heights; you can use our mountain bike size chart below to find the perfect fit for you.

Alternatively try our handy bike frame size calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full mountain bike range while you’re here?

Classic Bikes Size Guide

For timeless designs our classic bikes can’t be beaten, featuring the perfect combination of comfort and traditional British style. Classic bike frame sizes are measured in inches and are available in sweeping open frame style designs in a choice of frame sizes. Simply use our vintage bike sizing chart below to find the perfect fit for you.

Alternatively use our handy bike frame size calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full classic bike range while you’re here?

Road Bikes Size Guide

Our road bikes offer speed and efficiency coupled with ergonomic frame design and excellent shock absorption to make them comfortable enough to ride for hours at a time. Road bike frame sizes are measured in centimetres, you’ll be able to find additional sizing information and full geometry charts on individual product pages. Our road bikes are available in a wide variety of bicycle frame sizes to suit a range of different heights because we know that with road bikes getting the perfect fit is imperative for speed and endurance.

You can use our urban bike sizing chart below to find the perfect fit for you, or alternatively, try our handy bike frame size calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full road bike range while you’re here?

Adventure Bikes Size Guide

Our Adventure bikes are inspired by the gravel bike movement; designed to provide the ultimate riding experience on all terrains and built for speed & agility they’ll be your perfect companion on road or trail. Our Adventure bikes are available in a wide variety of bicycle frame sizes to suit a range of different heights just use our sizing chart below to find the perfect fit for you.

Alternatively try our handy bike frame size calculator at the top of this page to figure out which bike frame size you need. Plus why not check out our full Adventure bike range while you’re here?

Electric Bikes Size Guide

Our electric bikes have power-assisted pedalling that makes it easier to cycle for longer and tackle hills without slowing down. As our electric bikes span a range of bike types and frame styles we can’t offer a catch-all size guide for electric bikes but we’ve provided electric bike sizing charts for each of our models so that you can find the perfect fit for you. Most of our electric bikes are available in crossbar or low step frame styles with many available in a range of frame sizes. Why not check out our full electric bike range while you’re here?