HELP!!! ? regarding frame size: c-c vs. c-t vs. standover height

Quoted post said:

Originally posted by roubaix
Someone help me please.

I am looking at a new road frameset and have roughly a 30.5" inseam.

I was looking at LeMond frames as well as others but I know LeMond measures center to center and other manufactures measure center to top....what framesize between the two numbers would be "equal"? 51 and 53? 49 and 53?

HELP ME PLEASE!

Also, what about standover height? Can that be used alone as a means to pick the right frame size?

Thank you!!!!!!!

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Is that cycling inseam or pants inseam? Makes a big difference. Frames are measured c-c,c-t and c to top of extended seattube. Toptubes, and seattube angle also vary within the same nominal frame size,further complicating things.. Quit trying to guess and go find a LBS that can properly size and fit you.... Standover gets you in the ball park, then you have to wory about toptube length and ability to get the bars the right height.

A good way to start is to stand in your socks on and measure from the floor to your crotch. You can use a level and another person to do this. Simply put the level up to your crotch and pull up tight, level the level and have someone measure to the top of the level. In cm is the best way to measure it or convert to cm. Take that number and and multiply by .883 to get your saddle height from center of crank to top of saddle. If you take your inseam measurement and multiple by .65 that will get you in the ball park for frame size. Now you can go into a bike shop and measure frame sizes and saddle heights and see what frames feel the best to you. These measurements are not exact but they give you a starting point. There is nothing worse than going into a bike shop and not knowing anything. Maybe with this information you might know more that the employee so look at different shops to find someone that is helpful and knowledgeable. If you are buying on e-bay good luck. Do not be worried to much about weather it is c-c or c-t, you are still in the same ballpark. Top tube length is nexted and you can do this by riding bikes of the same size and thinking about different different stems. If you can get someone to measure your knee over the pedal spindle do that before deciding on the top tube length. Hope this helps.