Posted in Cycle
bike size guide wiggle

Welcome to our bike size guide

It's important to get the right size bike; because if the fit is good, your bike will be faster, more comfortable and easier to handle. This Wiggle bike size guide makes it easy to pick the right size bike for you, and explains how to use the specific size charts on each bike product page. You will also find geometry charts on the product pages for bikes sold at Wiggle; these are useful for those who know their bike size and geometry preferences.

If after reading this guide, you're still not sure on what size you need, then just book an appointment to talk to one of our experts - we offer a call-back service, to discuss sizes, and anything else you may like to know.

Once you've provisionally chosen your bike size, our qualified team of mechanics will still individually check each order against measurements supplied by you; to ensure the size chosen is correct.

All this should provide you with great confidence, when you are buying a bike from Wiggle!



How do I choose the right size bike?

Bikes are generally measured and defined by the length of the seat tube - this is the tube on the bike that the seat post (and saddle) slide into.

Traditionally, this measurement is given in metric (cm) for road bikes, and imperial (inches) for mountain bikes; however some bikes are also sized as small, medium, large etc.

The way that manufacturers measure their bikes, can differ slightly from one brand to the next. This is why Wiggle measures all of the bikes that we sell in the same way, and provide these universal measurement standards on our product pages for bikes.

bike size guide wiggle



What measurements do you need?

There are three measurements that will assist you in choosing the right size bike for your body shape: your height, your inside leg measurement, and your reach.


Stand over height

Your inside leg measurement will determine your stand over height - this is the clearance between the top tube of the bike, and your crotch; when stood just in front of the saddle. We suggest a clearance of at least 2 inches as minimum; to enable you to hop off quickly, as and when you need to!

bike size guide wiggle



If your height and inside legs measurements put you in-between two sizes, then your upper body should be the deciding factor in selecting the best sized bike for you. Your upper body dimensions determine your reach; which affects how 'stretched-out' you'll be along the top tube of your bike. To work out if you have a long or short reach, you need to determine your 'Ape Index' (arm span minus height).

  • If you have a positive Ape Index (i.e. your arm span is greater than your height), then we suggest you go for the larger of the two bike sizes.
  • If you have a negative Ape Index (i.e. your height is greater than your arm span), then you will probably be more comfortable on the smaller of the two bike sizes.

Example: 152cm (arm span) - 163cm (height) = minus 11. In this example, you have a negative 'Ape Index', and should go for a smaller frame size.

bike size guide wiggle



Do I need a women's specific bike or a unisex bike?

On average, women have longer legs and shorter torsos than men of the same height; so female specific bikes have a shorter top tube, with narrower handlebars and female specific saddles.

However, people are not "average", and a bike should be the perfect fit for you individually; whether it is a unisex bike or a women's specific fit.

As a general rule, if you are shorter than about 5ft 5 (165 cm), or you have felt too stretched on men's/unisex bike before; then you may be more suited to a female specific bike, which offers smaller frame sizes.

If in doubt, feel free to book an appointment with one of our experts; who can call you back help find the right bike for you.

View our range of Women's Specific Bikes at Wiggle

womens bikes at wiggle



How do you choose the correct size kids bike?

Children's bikes are measured and sized in a different way from adult bikes. They are usually categorised in age ranges and wheel sizes.

Below are some key points you should keep in mind when sizing your child:

  • Never use an age range to size your child for a bike, as this is simply for guidance. If your child is the tallest in the class, then you may need the next size up!
  • Height and inside leg measurement is still a key factor when sizing. Keep this in mind when picking your children's bike.
  • It is common to look for a "grow into" bike. Try and avoid this, as we wouldn't want your child to become scared of riding due to riding a bike that is too large/wobbly! Love and enjoy the sport for all ages!
  • Always contact us, if you need help!

View our great range of Kid's Bikes at Wiggle

kids bikes available at wiggle bike shop



Bike sizing charts

For reference, here are the generic bike size guide for different range of bikes sold at Wiggle.

Click on the bike size guide to take you to the relevant range of bikes.

mountain bikes at wiggle

hybrid commuter urban bikes at wiggle

road bikes at wiggle

road bikes at wiggle

child kids bikes at wiggle