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c-40 and company...trying to get STA from other measurements(9 posts)

c-40 and company...trying to get STA from other measurementsFrith
Mar 18, 2003 8:00 AM
I have my eye on an ebay bike (will show you all pics when i win it :)...all measurements are c-c...the seat tube and top tube are both 58cm. I wanted to know the STA so I e-mailed the seller asking for a measurement on the diagonal between the point where TT meets HT --to--> ST meets TT thinking I could used this imaginary line to figure out the angle of the triangle....
What he emailed me back was the head tube length and the down tube length.... so I now have the following measurements all C to C:
ST: 58
TT: 58
HT: 13
DT: 64
By now you've probably figured out that it's a classic steel... wait till you see it...gorgeous!! ;)
So is there any way I can get a good estimation of the STA given the above measurements...I hate to bug this guy again because he's been so good at getting me the info he thinks I want...He even drew me a little diagram.
short HT maybe, but show us the auction, someone will know. nmSpunout
Mar 18, 2003 8:02 AM
..oops, HT c-c. Total height should be around 165 for that?nmSpunout
Mar 18, 2003 8:03 AM
can't with this info...C-40
Mar 18, 2003 9:02 AM
The seller would have to know how to measure the "setback" to determine the STA. If it's stock, posting the make and model might be as helpful.

Setback is the horizontal distance from the center of the BB to the intersection of the seat and top tube centerlines.
what if i...Frith
Mar 18, 2003 10:37 AM
got the seller to measure diagonally from the ST+BB to the TT+HT intersections...couldn't I then use seat tube length, top tube length, and diagonal length to get the angles?
What kind of bike is it? It might not be hard to figure out (NM)DINOSAUR
Mar 18, 2003 9:06 AM
Mar 18, 2003 10:40 AM
Sorry I don't want to post the make or the ebay ad because I'm drooling over this bike so badly that I don't want to bring any extra advertising to it. selfish? probably... but you do funny things for love ;)
I promise to show everybody once I've bought it.
That's it. If I find out, I'm gonna buy it over your head! ;-)Spunout
Mar 18, 2003 11:41 AM
Why you little *&!!!!****DINOSAUR
Mar 18, 2003 2:37 PM
Old dino has a lot of time on his hands and I think I found the bike in question. I won't let the cat out of the bag. It is a nice bike!! I would not worry about the sta. I ride two bikes, one with a 73 sta and the other with a 74 sta. The only difference is where I position the saddle on it's rails. You can probably check the manufacturers website and look at the geometry charts. I don't think they have changed over the years. Good luck, I've bidded on stuff on ebay and it's fun.