seat height.
 

I have my seat height 72cm my bike have horizontale top tube. Is cannondale R300. From the horizontale top tube to the top of the seat is 5". The frame is 58cm. My height is 5'7 my inseam is 32". Because the seatpost is only 5" higher than the top tube that is means that bike is too tall for me?

There is no way someone can fit you to a bike by reading a post.

Especially not that one. Oy.

OP - post a side picture of you sitting on the bike. You can lean against a wall or have a friend hold it for you. Have your leg extended all the way down on the pedal, in the 6 o clock position. This will aide the forum in getting your saddle to the proper height.

Pictures are required. However, with a 32" inseam a 58cm frame is likely to be at the top end of what will fit you. How much seatpost is showing is not a reliable guide. When all road bikes had horizontal top tubes it was usual for only about a fistful of seatpost to show.

I'm 5'-11" with a 32 inch inseam and my Cannondale is a 54cm. I've tried a 56cm in two different models (CAAD 10 and Synapse) and the 56cm is just too big. I'm guessing your 58cm is too big for you.

What would make the bike too tall for you is if you don't have sufficient room between top tube and crotch when you're standing over it. The seat height adjustment is a separate issue.

If you can ride comfortably, then ... what is "fit" anyway?

As far as I understand, the only measurement which really matters is seat-BB-pedal spindle, where it is generally accepted that your knee at the top fo yuor stroke should be somewhere over the pedal spindle (it is Under ... whew, Serious problems.) Once you get the relationship between seat and BB/pedal spindle right the rest is comfort and preference.

People used to ride giant frames with very little exposed seat post and little bar-seat drop (and huge bar drops) but now the trend is small frames, a lot of seat post, more seat-bar drop and compact bars. A rider who might have "needed" a 60-cm frame by one system might "need" a 56 or 54 by the other. Both work in general---what works for you, only you can really decide.

Pretty basically, if you are very serious, pay $50-$100 for a pro fitting, and then hope the guy who fits you isn't just trying to sell you a new frame or components. If you are just riding to ride a bike ... if it doesn't hurt it is probably okay, and if it is actually comfortable, what more could you hope for?

Based on inseam and height, I'd say your frame is Big for you, but not necessarily Too big. I assume with a very short stem, 0-setback seat post and high bars you could ride it very comfortably----maybe you already do. Question is, do you want to go bike-shopping, or do you need to? Can you ride comfortably?

If you were to buy a new bike, I would go to a few shops and try some smaller models. But if you like your current bike and you can ride it as far as you like without discomfort .... then it fits.

All stated facts are actually opinions. Reader beware.

this works .... you may need a few minor tweaks but start off with what is suggested according to your measurements:

Bike Fit Calculator | Find Your Bike Size | Competitive Cyclist

+ 1 with 6th post, Can You stand flat bare footed straddling the top tube?

1) I never understood why standing barefoot was the way to choose, since not many people ride a road bike barefoot. Of course, doing so does provide a margin for error in one direction.

2) I used to ride a 58 cm/23" bike, because (shoes + leg length) was greater than (pedal + crank + seat tube + seatpost + saddle). It's just that I came down on the top tube hard one day, and that hurt ...um... a lot. I switched to a 54 cm/21" bike, and I could actually straddle the top tube with 1-1.5" between me and the tube.

The maneuver that hurt on the 58 did no damage on the 54. Alas, with added weight and years, the gap between me and the top tube has shrunk, which come to think of it is another benefit of switching from toe clips/straps/road shoes to BMX platforms and Five-Tens (thicker soles)....

The bike fit i want to do. But for now because all my bikes i have buy used i try see if i have selct the correct sizes. But 54cm bike i want to try.

What is "comfortable"?