Hi
Fit should be the main consideration when buying a new bike. After all, even 
the most expensive bike won't seem that great if it's too big or too small.
   
Steps:
1.
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.
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.
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.
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.
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.
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.
   
Tips:
 
You old bike is a great reference point. Measure the distance from the center 
of the bottom bracket to the top of your seat on your old bike. This assumes
that you have your seat adjusted to the proper height. If in doubt, see related 
eHow "Determine the Correct Saddle Height for Your Bike." Bring this 
measurement,
along with your inseam measurement and a tape measure, when you go to look at 
new bikes.
   
Once you have the right size frame, you can fine tune the fit with different 
stems and bars.
Finding the right saddle height will make you more efficient on the bike and 
will help prevent knee pain or injury.
   
Steps:
1.
Put on your regular cycling shoes.
  
2.
Sit on you bike. Stabilize yourself by placing one hand on a table or counter.
  
3.
Swing the pedals around to the bottom of the pedal stroke.
  
4.
Place your heel on the pedal.
  
5.
Adjust the seat height so that when your heel is on the pedal, your leg is 
perfectly straight - this way, when the ball of your foot is centered on the
pedal, you will have the right amount of bend in your leg.
  
6.
Fine-tune the fit. Put your feet on the pedals so that the balls of your feet 
are centered on the pedals, and pedal backward. Do your hips rock back and
forth? If so, the seat is too high. Conversely, if you feel cramped, it is 
probably too low.
  
7.
Go for a ride. If you don't have a quick-release seat, bring a 5-mm Allen 
wrench with you.
  
8.
Fine-tune the seat height during the ride. Experiment a bit, and go with what 
feels most comfortable.
   
Tips:
 
Mountain bikers may want the saddle slightly lower, especially if they ride a 
lot of difficult terrain.
   
Knee pain in the front of your knee can often mean your saddle is too low. Knee 
pain in the back of your knee can often mean your saddle is too high.
   
As you get in better shape, you may find yourself raising your saddle a bit.
   
 
Warnings:
 
Always wear a helmet when riding a bike.
   
  
   

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