How Do You Measure A Road Bike Frame Size

The instructions below explain how to measure a classic road bike.
How do you measure a road bike frame size. 51 cm mountain bike. I need some advice regarding a road bike frame size. I look to buy a entry level model or second hand but i want to make sure the frame is the correct for me i m 5 9 which indicates a medium size frame 54cm 55cm but my inseam is 87cm points to a larger bike. The frame size is determined by measuring the length of the seat tube in centimeters.
Method 3 bike size chart by height. Look for a size label on the bottom of the seat tube first. First consider what kind of bike you want sizing varies greatly between road and mountain bikes as well as between men s and women s models and even between. If you look near the bottom of this tube about 3 inches 7 6 cm up from the chain sprocket you ll see a glued on label that states the bike s frame size.
Consider the bike type. Imagine your leg inseam is 74cm then the best frame sizes for you are. 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. Whether you re looking to hit the trails on a mountain bike or whizz away on a road bike our handy bike frame size guide makes finding the right size bike easy.
The most important consideration to make as you decide which frame to go for is the effective top tube length. Take a look at our full bike size charts and guides below includng tips on how to measure a bike frame. The classic style road bike frame is most commonly found on road racing touring and commuting bikes. Road bike height charts should not be used as the only resource for sizing a road bike but are a good starting point for the basic frame size you should be looking for.
The top tube is parallel to the road giving the frame more stability and support. Some brands such as moots even mix the two. The seat tube is the long tube that the bike seat post sticks into. Some road bike charts are more specific with up to 6 or 7 categories of bike frame sizes.