Road Bike Fit - How To Measure A Bike Frame

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Road bikes are measured in many different ways. This makes choosing the right size for you difficult. GCN are here to help!

With so many different frame sizes and measurements on the market, choosing the correct size can seem daunting. Whether you are looking at a horizontal or sloping top tube, an integrated or standard seatpost, Daniel Lloyd takes you through how to measure each frame so that you can make an assessment about which bike is for you.

Stay with GCN for the next instalment on choosing the correct frame size for you!

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I’ll save you some time: The frame size of your bike is the seat tube length

isaacakhigbe

i think its also important to note that the different manufacturers have different sizes i.e the geometry and what not. So if your looking for a new bike make sure that you can try a size bigger or smaller because it is ultimately about your comfort when riding

megaman

Erm, yes that's definitely what we meant! It should be 130mm.

gcn

Top tube length is correctly measured parallel with the ground, not along the centre line of the tube, as shown in the video. That Focus bike doesn't have a level top tube, despite what is said in the video. You will get a smaller number if you measure the slope of the top tube than if you measure it level.

derosa

Stack and reach is harder to measure, but so much easier to determine if you actually fit a bike! Otherwise the fit coordinates only really match if the geometry angles are the same. Measure how much length there is in front of the bottom bracket to the head tube as this determines how long the bike will fit (saddle position is relative to the BB and thus no matter if the bike has a 72 degree or 75 degree seat angle, giving different top tube lengths the reach might be the same to the bars.)

JordanOroshiba

5 inches = 130cm? Must tell the mrs that in future.

Frazzle

Similarly with stack which is the height to the headset from BB, if that matches your bar setup then you are most likely golden. The exception is those with very small or no saddle to bar drop. In which case you need to also make sure your seat can go low enough.

JordanOroshiba

5 inches, or 34.6 kilometers, or 948 leagues, or approximately 3 fathoms.

allbunsglazing

So when people say frame size which measurement are they talking about?

sonomama

You should do a series on the best bikes at certain prices. I'm looking for a new bike, but it's overwhelming how many there are, and it's hard to narrow it down. (It also probably doesn't help that I spend most of the time looking/dreaming at >£10000 bikes.)

chrismilbourne