Bike Sizing Charts

Use these bike sizing charts to find the perfect sized bike or bike frame for your needs.

All offers below are brought to you in partnership with Chain Reaction Cycles, Wiggle, Evans Cycles and ProBikeKit.

The best bikes and cycling accessories from most popular online cycle retailers, bringing you the best deals on mountain bikes, road bikes, bmx bikes, bike lights and all other cycling accessories.

Now that the 2016 bike ranges have rolled out, there are still many 2014 – 2015 bikes available at massively discounted prices, and another bonus with buying pre 2016 bikes is, in many instances they’ll have better specifications than the new bike models.

Bike prices have increased a lot in recent years, whilst at the same time, the brakes, mechs, shocks etc on this years bikes may have been downgraded from the previous years, so grab yourself a 2014 – 2015 bargain while there are still some to be had, it’s good news all round for bargain hunters at this time of year.

Some bike retailers are offering big discounts on their original prices, if you go to Chain Reaction Cycles to buy a bike or bike accessories, they have regular sales of up to 64% off some of the top bike brands.

***Special Bike Sale Offers***

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Offer 3 Chain Reaction Cycles are offering up to 35% off their range of cycle clothing, click anywhere here to see the special sale offers.

Offer 4 Wiggle are also having their sale of cycle clothing, bike accessories, bike components, cycle shoes and other cycling products, there’s plenty of bargains to be had, click anywhere here to see the special sale offers.

Bike Sizing Chart

Choosing the correct frame size is very importance when you buy a new bike. A correctly fitted bike will mean you’re comfortable in the saddle, it will make your cycling more efficient and you’ll have more fun riding

Selecting the right sized bike can be confusing, even for the more experienced cyclist, the correct size frame will depend on the type of bike you want, your height, your style of riding and your preference. This guide aims to give you general advice on choosing the right sized bike for your needs. It is intended as a guide only

Please view the bike size guides below, or click the desired link to take you to the relevant bike sizing section:

Mountain bike sizing chart (hardtail & full suspension)
Women’s mountain bike sizing chart (hardtail & full suspension)
Road bike sizing chart
Women’s road bike sizing chart
Hybrid (commuting) bike sizing chart
Triathlon and time trial bike sizing chart
Jump and Trials bike sizing chart
Folding bike sizing chart
BMX bike sizing chart
Children’s bike sizing chart

How bike frames are measured

The size of a bike is determined by the size of the frame, which is based on the seat tube length. Bike manufacturers tend to measure from the centre of the bottom bracket up to the top of the seat tube where the seat post is located.

frame_size

On the other hand, some manufacturers measure things in a different way, their measurements might be from the intersection of the top tube and seat post to the bottom bracket, which can make a muddle of the sizings. Different manufacturers give sizes in different ways, some may measure them in centimetres, others in inches, and others might simply call a frame size small, medium, large or extra large.

Although frame sizes are based on the measurement of the seat tube, it isn’t just the seat tube that changes dependant on the size, the proportions of the frame change in relation to the frame size.

Getting the right size bike to match your height

To help you choose the right size bike, we give you a suggested height for the various types of frame sizes available, this should fairly accurately match your height to the right rame, but it’s essential that you measure your height accurately.

If your height is right on the edge of 2 size ranges, then your reach may well be the deciding factor in which size to purchase. In order to find discover if you’ve got a long reach or a short reach, you can measure this using the “ape index”, to do so, stand against a wall with your arms stretched out wide, measure the distance from one of your middle fingertips to the other. Then subtract your height from your arm span measurement. If the arm span is bigger than your height, you have a positive ape index, so go for the larger size, if you have a negative ape index go for the smaller size.

Stand over height

Stand over height is important, this is the clearance between the top of the top tube (your cross bar) and the bottom of your crotch. It’s important that you have enough clearance in this area to avoid contact with the top tube when you are at a standstill and astride the bike. For road bikes and hybrid bikes, 1 to 2 inches of clearance is, for a mountain bike, you need 2 to 4 inches.

The sizes recommend in the sizing charts do take stand over height into consideration. If you’ve got a close to average inside leg measurement our size chart recommendations will be fine. If you’ve got a short or long inside leg measurement in relation to your height, we recommend talking to your local bike retailer in store to make sure you purchase the best fitting bike.

What type of bike do I need, and for what type of cycling?

All types of bike are sized in different ways, for example, a 57cm road bike will be a completely different size to a 57cm time trial bike, so it’s important that you look at the correct sizing chart that matches the type of bike that you’re intending to purchase.

Road bikes, time trial bikes and triathlon bikes are the most important to size correctly, the reach factor can determine feel and the frame size required, stand over height is not as important.

The style or type of riding that you do will also affect which size you need, for example, a mountain biker who wants to ride a bit more aggressively and to be able to throw the bike around a bit more, may prefer a size smaller than they would normally ride. Likewise a cross country racer that is looking for a flatter and speedier mountain bike may prefer a size slightly larger than they would normally use. Basically, there’s no right or wrong when it comes down to size, personal preference will play a big part, as will how comfortable you feel and what is right for the type of riding that you do.

Mountain bike sizing chart (hardtail & full suspension)

Rider Height Frame Size Suggested
Feet and Inches Centimetres Inches Size
4′ 10″ – 5′ 2″ 148 – 158 13 – 14 XS
5′ 2″ – 5 ‘6″ 158 – 168 15 – 16 S
5′ ‘6″ – 5’ 10″ 168 – 178 17 – 18 M
5′ 10″ – 6′ 1″ 178 – 185 19 – 20 L
6′ 1″ – 6′ 4″ 185 – 193 21 – 22 XL
6 ‘4″ – 6’ 6″ 193 – 198 23 – 24 XXL

Women’s mountain bike sizing chart (hardtail & full suspension)

Rider Height Frame Size Suggested
Feet and Inches Centimetres Inches Size
4′ 10″ – 5′ 2″ 148 – 158 13 – 14 XS
5′ 2″ – 5 ‘6″ 158 – 168 15 – 16 S
5′ 6″ – 5′ 10″ 168 – 178 17 – 18 M
5′ 10″ – 6′ 1″ 178 – 185 19+ L

Please note

Women’s mountain bikes have specific differences to men’s mountain bikes.

Road bike sizing chart

Rider Height Frame Size Suggested
Feet and Inches Centimetres Centimetres Size
4′ 10″ – 5 ‘0″ 148 – 152 47 – 48 XXS
5′ 0 “- 5′ 3” 152 – 160 49 – 50 XS
5′ 3″ – 5′ 6″ 160 – 168 51 – 52 – 53 S
5 6″ – 5′ 9″ 168 – 175 54 – 55 M
5′ 9″ – 6′ 0″ 175 – 183 56 – 57 – 58 L
6′ 0″ – 6′ 3″ 183 – 191 58 – 59 – 60 XL
6′ 3″ – 6′ 6″ 191 – 198 61 – 62 – 63 XXL

Please note
The sloping geometry found on Colnago road bikes are 4cm smaller than traditional geometry. For example a 56cm Traditional frame will be equal to a 52cm sloping frame

Women’s road bike sizing chart

Rider Height Frame Size Suggested
Feet and Inches Centimetres Centimetres Size
4′ 10″ – 5′ 1″ 147 – 155 44 – 45 – 46 XXS
5′ 1″ – 5′ 3″ 155 – 160 47 – 48 – 49 XS
5′ 3″ – 5′ 5″ 160 – 165 50 – 51 – 52 S
5′ 5″ – 5′ 8″ 165 – 172 53 – 54 – 55 M
5′ 8″ – 5′ 10″ 172 – 180 56 – 57 L

Hybrid bike sizing chart

Rider Height Frame Size Suggested
Feet and Inches Centimetres Inches Size Centimetres
4′ 10″ – 5′ 1″ 147 – 155 13 – 14 XS 47 – 49
5′ 1″ – 5′ 5″ 155 – 165 15 – 16 S 50 – 52
5′ 5″ – 5′ 9″ 165 – 175 17 – 18 M 53 – 54
5′ 9″ – 6′ 0″ 175 – 183 19 -20 L 55 – 57
6′ 0″ – 6′ 3″ 183 – 191 21 – 22 XL 58 – 61
6′ 3″ – 6′ 6″ 191 – 198 23 – 25 XXL 61 – 63

Triathlon and Time Trial bike sizing chart

Rider Height Frame Size Suggested
Feet and Inches Centimetres Centimetres Size
5′ 0″ – 5′ 3″ 152 – 160 49 – 50 XS
5′ 3″ – 5′ 6″ 160 – 168 51 – 52 S
5′ 6″ – 5′ 9″ 168 – 175 53 -54 M
5′ 9″ – 6′ 0″ 175 – 183 55 – 56 L
6′ 0″ – 6′ 3″ 183 – 191 57 – 58 XL
6′ 3″ – 6′ 6″ 191 – 198 60 – 61 XXL

Jump and Trial bike sizing

As a general rule Jump and Trial bikes are one size fits all; catering for people from heights of 4′ 10″ – 6′ 4″ (148cm – 193cm). There are a few exceptions to this rule where size options are offered, if this is the case, please see your local bike shop for details.

Folding bike sizing

As a general rule of thumb, folding bikes are one size fits all catering for people from heights of 4′ 10″ – 6′ 4″ (148cm – 193cm).

Please note

Brompton bikes will require you to fit a telescopic seatpost if your inside leg measurement is larger than 35 inches (89cm).

BMX bike sizing chart

Rider Age or Height Wheel Size Suggested
Feet and Inches Centimetres Age Inches
3′ 7″ – 4′ 0″ 110 – 122 5 – 7 years 16
4′ 0″ – 4′ 10″ 122 – 147 7 – 11 years 18
4′ 10″ – 6′ 4″ 147 – 193 11+ years 20

Children’s bike sizing chart

Rider Age or Height Size Suggested
Age Feet and Inches Centimetres  
2 – 5 years 2′ 10″ – 3′ 7″ 85 – 110 Runner bikes
2 – 4 years 2′ 10″ – 3′ 4″ 85 – 100 12 inch wheel diameter
3 – 5 years 3′ 1″ – 3′ 7″ 95 – 110 14 inch wheel diameter
5 – 7 years 3′ 7″ – 4′ 0″ 110 – 120 16 inch wheel diameter
7 – 9 years 4′ 0″ – 4′ 5″ 120 – 135 20 inch wheel diameter
9 – 11 years 4′ 5″ – 4′ 9″ 135 – 145 24 inch wheel diameter
11+ years 4′ 9″+ 145+ 26 inch wheel diameter

Choosing the correct frame size is very importance when you buy a new bike. A correctly fitted bike will mean you’re comfortable in the saddle, it will make your cycling more efficient and you’ll have more fun riding.