Bike Sizing Guide

What size bike is right for me?

As a rider you want to feel comfortable on your bicycle. Choosing the correct size of bicycle is one of the most important decisions when buying a bicycle to make sure that your riding position is the most comfortable possible and maximises your efficiency whilst on the bike.  So how do you choose the correct size?

The easiest way is to estimate the correct size based on your height. Fortunately, Chappelli bicycles only come in 4 sizes so it makes it a lot easier to work out which bike is likely to be best for you. If you are between sizes we suggest that you go up a size as most people prefer to have a little more room and be a little more stretched out on a bicycle so generally a slightly bigger frame is better than a  smaller frame. Another way slightly more complex method is to work out your leg length and match that to the stand over height of a bicycle.

How are bicycle sizes worked out?

Bicycle sizes on road bikes and commuter bicycles are measured in centimetres and usually refer to the length of distance between the seat tube (where the saddle goes in) to the head tube (where the handlebars and front fork are). It usually corresponds to the length of the top tube if it runs straight from the seat tube to the head tube. The longer the top tube is the more stretched out you will be. Chappelli Cycles mostly use square frame geometry which means the length of the top tube is also the length of the seat tube. The stand over height is the height of the bicycle from top tube to ground and should be similar to your inseam length so that if you stand over the top tube with the bicycle between you legs you can stand comfortably with your feet flat on both sides.

Bike Geometry

Chappelli Sizing Guide

Chappelli Mens and Unisex bicycles are currently made in four frame sizes: Small (50cm); Medium (54cm); Large (58cm) and Extra-Large (61cm) that should fit the majority of people.

Chappelli women’s bicycles only come in Regular 50cm frames which should fit a most female riders.

Suggested frame size Small /Reg (50cm) Medium            (54 cm) Large                 (58 cm) Extra-Large (61cm)
Approx height cm 153cm-165cm 166 -178cm 179-185cm   185cm+
Approx height inches 5’1-5’6 5’7 – 5’10 5’10 -6’1  6’2+

How do I work out my leg length?

The second may to determine the best bike size is measuring your leg length. You may need a friend to help you out and you’ll need a measuring tape.

  1. Take off your shoes and socks, and stand with your feet shoulder width apart.
  2. Take a book or something similar and hold it between your legs as if it were the saddle of your bike. It should be as high as it will comfortably go.
  3. Now, measure from the top of the book to the ground making sure the measuring tape is straight. This measurement will usually be slightly less than half of your height.
  4. You can use this measurement to calculate the distance from your saddle to the bottom bracket ie. the centre of the crank.
  5. The distance from the top of the saddle to this bottom bracket should be ~110% of your leg length measurement. Remember the saddle tube can be adjusted to obtain the correct saddle height.

Another quick check, we often use when you come into store is to sit on the bicycle and looking at the angle your knee is bent at the bottom of the pedal stroke. Ideally you should have approximately a 30′ degree angle in your knee. Much straighter and you risk over-extending, much more bent and you won’t be getting maximum power from each pedal stroke.