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Bike Sizing

What size bike do I need?

Choosing the right frame size for your new bike makes all the difference, because if the fit is good you will be more comfortable when cycling, the handling will be easier and you will be able to ride more efficiently. In this bike size guide we will explain how you can use the bike size charts and sizing calculator to get the ideal fit.To choose the right size bike you will need to match your height and inside leg measurement to the frame size recommended by the manufacturer. 

 

Road Bike Size Guide

How are road bikes sized?

Road bikes are usually sized either in centimetres or with a general size like medium or large. It is the frame size that determines road bike sizing. Classically, frame sizes are based on the length of the seat tube, measured from the centre of the front chain ring to the top of the seat tube. Compact road bike frames, with a sloping top tube, will either show a measurement based on a classic frame or a general size like small or medium. Sizes will vary slightly between manufacturers.

Measure your height

Take your shoes off and stand on a flat surface next to a wall with your legs together and shoulders back.

Place a pencil on your head holding it horizontally, make a little mark on the wall and measure the distance from there to the floor.

Measure your inside leg

With your shoes off, stand with your back against the wall. Place a book or ruler between your legs at your crotch and make sure it is level.

Get a friend to measure from the top of the book/ruler to the floor.

 

 

 

Road Bike Sizing Chart

Height

Insideleg

Road bike size

152cm / 5’.0"

71cm / 28”

48cm (XX Small)

160cm / 5’3”

75cm / 29.5"

51cm (Small)

170cm / 5’7”

80cm / 31.5"

54cm (Medium)

175cm / 5’9”

83cm / 32.5"

56cm (Large)

180cm / 5’11”

85cm / 33.5"

57cm (X Large)

188cm / 6’2”

89cm / 35"

60cm (XX Large)

196cm / 6’5”

93cm / 36.5"

63cm (XXX Large)

 

 

Mountain Bike Size Guide

 

What size mountain bike do I need?

Getting the right mountain bike frame size will make all the difference to your riding. A good fit will mean you are more comfortable on the bike, the handling easier and you will be able to ride more efficiently. In this guide we will explain MTB sizing, show you how to use the size charts and bike size calculator so you can get the best mountain bike fit.

 

Typical Mountain Bike Sizing Chart

Height

Inside leg

Mountain bike size

152cm / 5’.0"

71cm / 28”

15" (X Small)

160cm / 5’3”

75cm / 29.5"

16" Small)

170cm / 5’7”

80cm / 31.5"

17" (Medium)

175cm / 5’9”

83cm / 32.5"

18" (Medium)

180cm / 5’11”

85cm / 33.5"

19" (Large)

188cm / 6’2”

89cm / 35"

20" (Large)

196cm / 6’5”

93cm / 36.5"

21" (X Large)

 

What mountain bike wheel size is best for me?

Mountain bikes are available in a range of wheel sizes and each one has their own distinct advantages. Smaller wheels are nimbler and quicker to accelerate while larger hoops carry speed better over rough terrain so tend to be faster. Smaller wheels also tend to be stronger and lighter than larger ones.

As well as performance, wheel size also has an impact on the overall fit of the bike. Smaller mountain bikers will find smaller wheels more manageable, while larger riders often prefer the fit that larger wheeled bikes offer.

Some brands, including Cube and Scott, offer a split size strategy for wheel size. Small frame sizes are offered with 27.5" wheels while the larger sizes roll on 29" wheels, medium frame sizes are available with either 27.5" or 29" wheels.

 

26" wheels

This is the traditional mountain bike wheel size but most MTBs now feature larger wheels. 26” wheels are still a good option for junior riders and smaller adults who will find them more manageable than larger hoops. Most dirt jump MTBs still roll on 26” wheels.

 

 

27.5" (650b) wheels

 

This is now the most common wheel size on all mountain bikes from trail bikes to downhill steeds. 27.5” wheels offer the ideal balance between the nimble handling characteristics and rapid rolling performance. Some manufacturers offer 27.5” wheels on smaller sized models with 29” wheels for the larger frame sizes.

 

 

 

27.5"+ (6Fattie) wheels

 

With 2.8” and 3.0” tyres on a 27.5” rim these tyres have a similar overall diameter to 29” wheels and are often compatible with 29er MTBs that feature BOOST axle spacing on the fork and back wheel. Offering more grip and more float (cushioning) this wheel size is ideal for hardtails although the extra weight will make them slower to accelerate.

 

29" wheels

29ers are becoming increasingly popular, especially with cross country, enduro and downhill racers. While slower to accelerate, these larger hoops carry speed much better over rough terrain so tend to be faster and offer more grip due to the larger contact patch of the tyre on the ground. They are less nimble than 27.5” wheels and some smaller riders will find them a bit of a handful in technical terrain.

 

What size MTB should I choose if I am between sizes?

Sometimes our bike sizing calculator will recommend two different sizing options. This means that both the larger and smaller sizes recommended will both be suitable. It is a personal choice which size to go for, but most mountain bikers tend to opt for the larger size. So you don’t feel too stretched, you can (depending on the model) fit a shorter stem to improve the fit of a larger bike without adversely affecting the handling. This is the opposite to a road bike where it is better to lengthen the stem rather than shorten it.

 

 

Hybrid Bike Size Guide

 

How are hybrid bikes sized?

Hybrid bikes combine aspects of both road and mountain bikes and are either sized in inches (or occasionally centimetres), based on the length of the seat tube, or with a general size like medium or large, depending on the manufacturer. Sizes will vary slightly between manufacturers.

Typical Hybrid Bike Sizing Chart

Height

Insideleg

Hybridbike size

152cm / 5’.0"

71cm / 28”

15" (X Small)

160cm / 5’3”

75cm / 29.5"

16" (Small)

170cm / 5’7”

80cm / 31.5"

17" (Medium)

175cm / 5’9”

83cm / 32.5"

18" (Medium)

180cm / 5’11”

85cm / 33.5"

19" (Large)

188cm / 6’2”

89cm / 35"

20" (Large)

196cm / 6’5”

93cm / 36.5"

21" (X Large)

 

What size hybrid bike should I choose if I am between sizes?

Our bike sizing calculator will sometimes recommend two different sizing options. This means that both the larger and smaller sizes recommended will be suitable for you. Which one you choose comes down to personal preference but, if you are unsure, the general rule of thumb is to go for the smaller size option.

This is because it is easier to make a small bike bigger (by raising the saddle height and/or fitting a longer stem) than it is to make a large bike smaller. However, on a hybrid bike, if you feel too stretched, you can also shorten the stem without adversely affecting the handling.


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