To find the correct sized bike you will need to measure your height and your inside leg.
Mens bike frame size guide.
Move your saddle up or down until you have nice bend behind your knee.
Hybrid bike inseam in cm x 0 685 your frame size mountain bike inseam in cm x 0 66 your frame size road bike inseam in cm x 0 70 your frame size.
That s a system used for some road bikes too.
Merida s road bikes go through s s m m l and l.
For your height stand against a wall and mark the wall with a pencil so it s level with the top of your head.
It should be something around 30 but don t.
It is fairly simple.
Now run the measuring tape up your seat tube.
A quick guide to sizing your bike frame.
If it is just the frame this will be the center point in the bottom bracket shell.
When searching online for advice about bike sizing you will.
That s not true of mountain bikes where the frame size is usually marked s m l etc.
Sizing varies greatly between road and mountain bikes as well as between men s and women s models and even between individual manufacturers.
Bike frame sizes are measured in the same way for all styles of bicycle.
When you reach the end of the seat tube you have your frame size.
To measure your bike s frame size take a measuring tape and place the tape in the center bolt of your bike s cranks.
Then measure from the ground up to the mark having someone to help might make this easier.
51 cm mountain bike.
Lean to the wall with your elbow sitting on the bike or let someone help you as shown on the picture but your leg to lowest point but parallel to the ground.