If all three have a 15 frame there will be a height difference between them due to their wheel size.
Bike seat tube sizes.
Old us bicycles mostly bmx and older bikes that used one piece cranks was 1 25 4 mm.
While not all bicycle frames have a size label it ll save you some work if yours does.
Schwinn bikes come in two variations.
British and italian standard for seat tube diameter was 1 1 8 28 6 mm.
One size that fits the average population of adults and other bikes that come in different sizes just like clothes.
The seat tube contains the seatpost of the bike which connects to the saddle.
The seat tube is the long tube that the bike seat post sticks into.
First bicycle frames were made mostly from steel with steel tubes of a standard outer diameter.
Again it s trickier than it sounds.
On some bikes this is achieved using a quick release lever.
The seat tube length also stands for the bicycle size is measured along the seat tube starting at the center of the bottom bracket and ending at the end of the seat tube.
If the size isn t given.
Frames made to british or italian standards will typically have 1 1 8 28 6 mm seat tubes older french bicycles used 28 mm.
You can find them with 26 wheels 27 5 wheels or 29 wheels.
This is marked with a minimum insertion mark.
Old american style commonly used on bmx bicycles and other bicycles that use one piece cranks uses a 1 seat tube standard outside diameter accommodates standard lugs and clamp on parts such as front.
Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube.
The saddle height is adjustable by changing how far the seatpost is inserted into the seat tube.
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.
The seatpost must be inserted at least a certain length.
Schwinn bikes that come in one size if you are an average sized adult male or female you will be able to fit 90 of schwinn s bicycles that come in a single size.
The top tube length is measured along the top tube starting at the center of the seat tube and ending at the center of the head tube.
While there are now fewer frame sizes to choose from for many mass produced bikes deciding on a frame size remains a convoluted process.
We usually give four sizes for the complete bicycles and three sizes for the frames.
Older french bicycles used 28 mm tubing.
Some bikes like the trek madone have a.
As for the saddle the seat tube may be.
Most steel bicycle frames have tubing of standard outside diameter.
Mountains bikes now come in three different wheel sizes.
