How To Measure A 20 Inch Bike? Simple Steps With Chart


Everyone loves to ride, and whether you are a kid looking for your first ride or an expert, you have likely to ride a bike at least once in your life.

And one of the common bikes we all have seen in almost any home is the 20-inch bike.

To get the ideal and best 20-inch bike, first of all, make sure it fits you properly. And how can you do that? Pretty simple! You have to measure it, of course!

Measuring a 20-inch bike is quite simple, but sometimes simple things can look complicated and make things hard for us.

So, we thought, why not give you a short tour about measuring your 20-inch bike for a perfect fit.

A 20-inch bike looks quite small but it is slightly larger than a 16-inch bike though and can be ridden by older and taller kids and adults as well.

It means 7 years old may fit on it or 4 years too may fit on it. Yep! It’s pretty confusing and we also know the look on your face right now! And we also know you are thinking that then what age range is actually a 20-inch bike for?

What we would say is that age is not an important factor in determining whether the bike is for you or not! Rather it mostly depends on the inseam and height of the rider.

If your kid’s or maybe your inseam is 19 to 25 inches and height is 45 to 54 inches, then you are perfectly good to go with a 20-inch bike!

Okay, let’s get to the point of measuring a 20-inch bike.

Measure a 20-inch kids bike:

If you are measuring the 20-inch bike for a kid, then remember that kid’s bikes are measured by wheel size, not by frame size.

• You can measure the diameter of your bike’s tire or look at the tire for the size. If you are looking on the bike for the size of the tire, then look for this format: an” X n.n”.

You should also find the diameter clearly labeled on the bike’s packaging or box. Or you can also ask the sales associates at the store if you are not sure where to find the diameter of the wheel.

If you want to measure it, then using a measuring tape, start measuring from the outside of the tire and pull the tape straight across until you reach the other side of the tire vertically or you can also do it horizontally, or which seems better to you.

And the number on the measuring tape is the diameter of the bike’s tire.

• If you find the size of the tire, then the first dimension is the tire diameter and the second dimension is the thickness of the tire.

• Now, keep a record of the tire diameter, as this is also the frame size of the bike.

Note that, you have to use this measured diameter (frame size of the bike) to find the right size bike for you.

Don’t worry if the kid’s age is around 5 to 9 years or height is 100 cm to 144, a 20 inch will fit them perfectly.

Measure a 20-inch adults bike:

Again in the case of a 20-inch bike for adults, you have to measure the frame size.

It also varies according to manufacturer, brands, and types of bike. Road bikes are mostly measured in centimeters (cm) and mountain bikes in inches (in).

You can measure the top tube, the horizontal distance between the centerline of the head tube and the centerline of the seat post.

You can also get the frame size by measuring the seat tube, which is the straight line distance between the center of the bottom bracket and the top of the seat tube.

Keep in mind that the frame size is generally the same as the length of the seat tube in centimeters!

Below we have attached a size chart for adults according to the frame size so that it might help you get a perfect-sized bike.

But before that, note that size charts vary according to different types of bikes.

Road bikes size to measure:

As we have said before, road bikes are sized cm, using a combination of your height and inseam. And only 1-inch clearance is needed over the top tube or crossbar.

Road bike sizes also vary according to manufacturers.

Riders height in feet Riders height in cm Inside leg in inches Inside leg in cm Suggested frame size in cm
4.10 – 5.0 147 – 152 24 – 26 61 – 66 47 – 48
5.0 – 5.2 152 – 158 25 – 27 64 – 69 49 – 51
5.2 – 5.4 158 – 163 26 – 29 66 – 74 51 – 52
5.4 – 5.6 163 – 168 28 – 30 71 – 76 52 – 53
5.6 – 5.8 168 – 173 29 – 31 74 – 79 53 – 54
5.8 – 5.10 173 – 178 30 – 32 76 – 81 54 – 56
5.10 – 6.0 178 – 183 31 – 33 79 – 84 56 – 58
6.0 – 6.2 183 – 188 32 – 34 81 – 86 58 – 60
6.2 – 6.4 188 – 193 33 – 35 84 – 89 60 – 62
6.4+ 193+ 34+ 81+ 62+

Hardtail mountain bike to measure:

These types of bikes have smaller frames than road bikes. It allows the riders to move around more freely on challenging terrain. Their heights are much lower than road bikes.

Compared to the road bike, the seating position on a mountain bike is more upright, with arms wider apart and weight positioned further back.

Riders height in feet Riders height in cm Suggested frame size in inches
4.10 – 5.0 147 – 152 13
5.0 – 5.2 152 – 158 14
5.2 – 5.4 158 – 163 15
5.4 – 5.6 163 – 168 16
5.6 – 5.8 168 – 173 17
5.8 – 5.10 173 – 178 17 – 18
5.10 – 6.0 178 – 183 18 – 19
6.0 – 6.2 183 – 188 19 – 20
6.2 – 6.4 188 – 193 21 – 22
6.4+ 193+ 23+

The tables above are for providing a general guide only.

Alright! Thanks for reading our informative content for measuring the bikes properly.

Daniel D. Harris

I am Daniel D. Harris, an enthusiastic biker who loves to ride bicycles. I keep on sharing my experience of cycling through this blog. I do keep writing to assist you in finding the city bikes, bike lights, bike pedals, and many more things related to bicycles. You may find my blog useful once you read some posts. Find me on twitter. Have a good day bikers!





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