Road Bike Size Top Tube Or Seat Tube

There s much more to understanding road bike frame sizing than effective top tube length stack and reach and choosing the right size is key to proper fit and handling. A sloping top tube does not look right to me. Again it s trickier than it sounds.

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Complete Bike Frame Size Guide Bike Frame Measurement Size

Bottom Bracket Drop Bottom Bracket Seat Tube Simple Bicycle

Road Bike Sizing What Size Bike Do I Need Road Bike Frames

I think its a cost cutting measure.

Road bike size top tube or seat tube. The instructions below explain how to measure a classic road bike. Some bikes like the trek madone have a. The classic style road bike frame is most commonly found on road racing touring and commuting bikes. In contrast trek s boone cyclocross bike has a slacker head tube angle of 72 a 45mm fork offset and a much higher trail of 67mm.

Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube. Trek s madone road race bike we ll talk about a 56cm size here has a head tube angle of 73 5. You save a lot of weight on bikes by have nice light rims and alloy or stainless steel spokes and a shorter seat post plus narrow handle bars and run skinny 25 or 22 tires. The weight you would save is very small.

When it comes to the top tube the angle of the head tube and seat tube will have an impact if a bike has a 55cm top tube and a 70º angle and another has a 73 5º angle effectively the. The top tube is parallel to the road giving the frame more stability and support. This along with a 40mm fork offset and the wheel tyre size results in a trail of 58mm. Historically women s bicycle frames had a top tube that connected in the middle of the seat tube instead of the top resulting in a lower standover height this was to allow the rider to dismount while wearing a skirt or dress the design has since been used in unisex utility bikes to facilitate easy mounting and dismounting and is also known as a step through frame or an open frame.

The frame size is determined by measuring the length of the seat tube in centimeters.