How do you work out what bike frame size yuo require?

Answer 1

Stand over the saddle; your groin should be clear of the seat by between one and two inches.

Answer 2

To determine your proper frame size, you’ll first need to get an accurate inseam measurement . Stand with your back against a wall, your bare feet 6" apart on a hard floor,
looking straight ahead.
Place a book or carpenter’s square between your legs with one edge against the wall, and pull it up firmly into your crotch, simulating the pressure of your saddle while riding. Have a helper measure from the top edge of the book to the floor, in centimeters. (You can convert inches to centimeters by multiplying inches by 2.54.) Repeat two or three times, for consistency, and average the results to get your inseam length.

Source(s):
Frame size refers to the length of the frame’s seat tube. Pro frames are measured along the seat tube in one of two ways, center-to-top (C-T) or center-to-center (C-C). C-T measures the distance from the center of the bottom bracket to the top of the top tube or seat lug (See image bellow). C-C measures from the center of the bottom bracket to the center of the top tube. Since C-T measures to a point higher on the frame, a frame measuring 55cm C-T would also measure roughly 53.5–54cm C-C, a difference of 1–1.5cm.

To size your C-T road frame, we use a guideline of .67 x inseam length. For example, if you have an 85cm inseam, your C-T frame size would be .67 x 85cm, or 57cm.

LeMond’s formula, from his former coach, Cyrille Guimard, establishes C-C size by the formula .65 x inseam length, which yields virtually the same frame size when you add the 1–1.5cm difference between C-C and C-T.

Larger riders (6'0" and up) may find that this formula puts them on a too small, and uncomfortable, road frame. A taller cyclist who wants a more comfortable frame may be better off selecting a frame 27–28cm less than inseam length, C-T.

For a mountain bike, we start by recommending a frame in the range of 10–12cm smaller than you take in a road frame. For example, if you ride a 55cm C-T road frame, look for a 43–45cm (17–18") C-T mountain frame

Answer 3

Measure your inseam. Convert to centimeters by multiplying inches by 2.54. For a road bike the frame size should be .67 X Inseam. A mountain bike frame should be 10-12 centimeters smaller.

Answer 4

I have normally worked on the basis of being able to get the heel of your shoe onto the pedal when it is in its lowest position when sitting on the saddle; or if you are getting a bike and you need to know what size to aim for I have used Inside Leg measurement less 10 (In old money - inches.) This then gives the length of the down tube needed. To convert to new money - cms multiply by 2.54

Answer 5

You really have to go to a specialised bike store. There they have special measurement equipment, which tells you what frame size fits you the best. But also, and this is very important too, they are able to determine the total configuration of your bike. Because frame size is one, but if the rest of the bike doesn't fit well, you will cycle yourself injuries.

Answer 6

Go to a bike shop an try some out sit on them and when u can just about reach the floor with ur tip toes that is the size u need.

Answer 7

Go to bike store... Whatever kind of bike you choose, your knees should be slightly bent when the pedal is in the downswing (nearest the ground) The saddle (seat) should adjust some to help for raising or lowering you a bit.

Answer 8

You should consult your local bike shop, then test ride a few sizes based on their recommendations and see which one you like the feel of.

Answer 9

Stand astride the bike over the seat and let your toes settle flat on the floor/road (not your whole foot.

Answer 10

You want the seat height to be such that when you have your heel on the pedals in the lowest posistion your leg is straight. That way when you pedal using the ball of your foot there is a slight bend to it.