Getting the Right Size Bike

Bike Size Chart Guide

If you’re in the market for a new bike, knowing what size bike you need can really come in handy. After all, bikes come in all shapes and sizes, so learning how to measure for a bike is important to ensure you ride away on the model that’s right for you.

If you’re not sure what size bike you should get, then don’t worry. Whether you’re looking to hit the trails on a mountain bike or whizz away on a road bike, our handy bike frame size guide makes finding the right size bike easy. Take a look at our full bike size charts and guides below including tips on how to measure a bike frame:

Bike sizing differs from bike to bike and the things you’re looking for will vary depending on which type you’re considering, so make sure to choose the guide most relevant to you. Don't forget that bike sizes can vary from brand to brand too; one brand's 18" isn't necessarily the same as another brand's. Not sure what kind of bike you'd like? Head over to our bike buyers guide to find out the differences and help you decide.

Bike Size Guide Chart

Below is a typical bike size guide to help get you started.

Please note that this is a general chart and, as previously mentioned, bike sizing will differ from bike to bike and between bike types. We therefore recommend always referring to the specific size guide provided on the product page for your chosen bike.

Height (Centimetres & Feet) Inside Leg Road Bike Frame Size (CM) Mountain Bike Frame Size(CM)
152cm / 5'.0" 71cm / 28" 48cm (XX Small) 15" (X Small)
160cm / 5'.3" 75cm / 29.5" 51cm (Small) 16" (Small)
170cm / 5'.7" 79cm / 31" 54cm (Medium) 17" (Medium)
175cm / 5'.9" 83cm / 32.5" 56cm (Large) 18" (Medium)
180cm / 5'.11" 85cm / 33.5" 57cm (X Large) 19" (Large)
188cm / 6'.2" 89cm / 35" 60cm (XX Large) 20" (Large)
196cm / 6'.5" 93cm / 36.5" 63cm (XXX Large) 21" (X Large)

What size frame do I need if I’m in-between sizes?

You might find that the results you’re getting from bike sizing charts or our bike size calculator seem a little inconclusive and you’re being offered two different frame sizes.

What this means is that you’re effectively between sizes, and both the larger and smaller frames would be suitable.

So how do you narrow it down to find the best sized frame for you? Well, the key measurement is ‘reach’. This is basically how long the bike feels when you’re in the riding position. Your reach is influenced by your upper body length (also known as your ‘trunk length or sitting height).

If your trunk length is longer than average, then we’d recommend the larger of the two sizes that you’ve been given. If your trunk length is shorter than average, then go for the smaller of the two sizes instead.

If you’re still unsure what size bike frame is right for you, or need a helping hand, then nothing beats actually trying the bike out in person. Simply pop into your local Halfords store and we’ll be happy to help find you the right size bike for your next journey!

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