How tall a bike should you buy?

Answer 1

The old truth was that you should have 1-2" clearance between your crotch and the top tube, but current designs often use sloping top tubes whch messes up the old reference. There are plenty of sites that'll give you some guidelines, do a search for "bicycle fitting" and see what you'll come up with. Try a couple of the different methods and them pick a comparison from the middle of the group. The most crucial value is that when you're in the saddle you should be able to have your leg almost fully extended when the pedal is at its lowest position.

Answer 2

stand up straight with the frame of the bike between your legs. make sure that the bike seat touches your back. stand up straight. you should have no more than 1 1/2 inches between the frame and between your legs

Depends what kind of bike lol my frame is about up to my knee

Answer 3

The old truth was that you should have 1-2" clearance between your crotch and the top tube, but current designs often use sloping top tubes whch messes up the old reference. There are plenty of sites that'll give you some guidelines, do a search for "bike fitting" and see what you'll come up with. Try a couple of the different methods and them pick a comparison from the middle of the group. The most crucial value is that when you're in the saddle you should be able to have your leg almost fully extended when the pedal is at its lowest position.

1. Step1

   Measure your inseam. This is best done barefoot. Stand against the wall and put a book between you legs so it pressed right up against your pelvic bone. Make a mark with a pencil on the wall along the top of the book. Measure the distance from the floor to the mark in centimeters.

2. Step 2

   Use your inseam measurement to get a rough idea of your road bike size. Multiply your inseam by .65. This will give you a good estimate of you road bike size for bikes measured center to center. Thus if your inseam is 86 cm, you will fit a 56cm road bike (86 x .65 = 55.9). Note that many road bikes are measured center to top. To determine how to fit these bikes, multiply your inseam by .67.

3. Step 3

   Subtract an additional 10cm and convert this measurement to inches to get your mountain bike frame size, roughly. Thus, if you fit a 56cm road bike (c-c), you will fit a 46cm - or an 18" - mountain bike.

4. Step 4

   Consider top tube length. In many ways, this is the most important aspect of sizing a bike. Two 18" mountain bikes may have different length top tubes. Or a 54cm and an 56cm road bike may have the same length top tube. Given the same top tube length, the bigger bike may be more comfortable in that it will allow you to get the bars up a bit higher.

5. Step 5

   Know that women have longer legs and shorter top tubes than men. Unfortunately, most bikes are designed for men, and women often have a hard time finding a bike that will fit them well. Luckily, some manufacturers have begun to make women-specific models.

6. Step 6

   Test ride some bikes once you have gotten a rough idea of what will fit you. This will help you determine what is most comfortable for you.

Answer 4

The two most critical measurements are usually seen to be: # When you're in the saddle you should have a tiny, tiny bend in your knee when the pedal is at its lowest. # When you have both feet on the ground you should have some clearance between your crotch and the top tube. There's plenty more, but I suggest that you do a search for "bicycle fitting". Take the measurements, do the calculations and see what you get.

Answer 5

For BMX, I have no idea. But for adult sized bikes I'll post a couple of links

Answer 6

Do a net search for "bicycle fitting". do the math as suggested for two different calculator. Average the two and you have a nice ballpark value.