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Road Newbie with q's about bike fit(4 posts)

Road Newbie with q's about bike fitHedgehog
Jul 27, 2003 3:06 PM
I just bought a Pinarello Surprize from my friend. I think it is a little small (58cm, I'm 6'1) but It was a good deal. In order to make it fit I have made a few changes.

1. longer seatpost, is there any danger of causing harm to the frame with a longer post? The tip of the saddle is about 21cm above the top tube.

2. I have put on a +10 degree stem, other than not aesthetics, anything to worry about here?

3. Does this bike have a high BB? It seems that most recommendations are to have 17cm between the seat and top tube but I can't see how that would provide enough standover height. Even with this frame I seem to only have a couple of inches.

thanks for any answers.
too small...C-40
Jul 27, 2003 7:59 PM
Tall riders may tolerate a smaller frame if they have long arms. With the saddle only 17cm above the top tube, you should have about 4cm of standover clearance to "hard" contact in bare feet. The bars will also be 9-10cm below the saddle with a typical 80-84 degree stem and no spacers.

With the saddle 21cm above the top tube, a flipped stem with an angle of 96-100 degrees will probably be needed to minimize the steering tube spacers.

Clearance is measured to weight bearing top tube contact. I'll bet you can put blocks under the tires that are at least 3 inches thick before the top tube would produce weight bearing contact. That's twice the needed clearance.
re: Road Newbie with q's about bike fitGregJ
Jul 27, 2003 9:55 PM
I have a Pinarello Surprise and I quite like it. The 58 cm version (if you are measuring center to center, that is how Pinarello measures) will actually be 61 center to top of seat tube. This bike has a fairly generous head tube as well. The 58 fits me very well and I am 6 feet tall with a 34.75 inseam. I have no spacers under the stem with a 17 degree stem flipped upwards, to heck with the stem police, I think bikes look better that way.
Check your seat height, you may have your saddle set up too high, I think this bike should fit you fine with a standard seatpost unless you have really, really long legs. What is your inseam measure?
Jul 28, 2003 6:39 AM
Everyone's body is different. I'm 6ft and ride a 56cm Surprise. It fits very well. 58 was too tall and too long for my body. With the saddle 21cm above the TT, you'd probably be better off with a size up, but it is always hard to fit a bike over the internet.