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Fit question for C40 and other gurus(11 posts)

Fit question for C40 and other gurusj-son
Jun 14, 2003 3:23 PM
I just got a new frame, a Pegoretti Fina Estampa. I ordered it from a reputable on-line dealer after much research. I consulted the geometry chart and all seemed well. The frame has pretty basic Italian geometry (standard, not sloping): 55cm TT, 15.3cm setback, 73.5 SA, 73 HA. The frame replaced a Serotta with a 73 SA and 54.5 cm TT.

The problem: the frame feels huge. Very tall. With the saddle at the right height, there is only a few cm of seatpost showing and the bars are nearly even with the seat. It looks a little funky and doesn't feel quite right.

Any advice? Should I return it, and take a hit on restocking fees? Keep it, and deal with a stubby seatpost? Any other words of advice?

re: Fit question for C40 and other gurusj-son
Jun 14, 2003 3:39 PM
Here's close-up photo of the amount of seatpost showing. I actually need to drop the seat about another 1cm or so.
how to do it next time...C-40
Jun 15, 2003 5:48 AM
Measure the dimensions of your current frame, IF it fits reasonably well. You can't easily measure seat tube angle, but setback can be measured with a plumb bob. Frame size (center to center) and top tube length are easily measured.

The top of the saddle should be about 16-18cm above the top tube (measured vertically). The saddle in your picture has an unusual dropped nose. The measurement should be taken from a relatively level portion of the saddle, ignoring the dropped nose. If you Serotta is not close to this, then it's probably the wrong size too.

Stock frames of the same c-c size rarely vary much more than 1cm in any dimension. If you measure properly, it should be simple to get a frame that is the correct size. That's why I suggested that you measure the frame that was shipped to you. It's so huge, that there is no way it could be close to the size of your Serotta (unless it is also way too big).
How does the TT feel ? [NT]268generation
Jun 14, 2003 5:01 PM
No Text
re: Fit question for C40 and other guruskoala
Jun 14, 2003 8:20 PM
The effective tt difference is just over one cm. What are the seat tube measurements of these two frames? Unless the picture is deceiving, the frame looks small. Problem is with the Peg having the longer top tube a larger frame exacerbates this problem. What length stem were you using on the Serotta? My feeble mind needs these questions answered before a good answer can be rendered.
I meant the frame looks big...bed time for bonzo.koala
Jun 14, 2003 8:22 PM
re: Fit question for C40 and other gurusj-son
Jun 15, 2003 1:08 AM
I'm using a 120 on both. I also figured an effective TT length increase of about 1 cm. The TT feels okay, the bike just feels very tall and the seat is pretty much sitting on the toptube. Not a pretty arrangement for such a pretty frame.

The Serotta seattube measures out to 53cm (c-c) and the Fina at 54 (also, c-c). But, the Fina has a raised seat collar and an elevated headtube. Side by side, the Fina is visibly much taller than the Serotta.

I'm terribly bummed. I'm resigned to boxing it up and shipping it back on Monday.

re: Fit question for C40 and other guruskoala
Jun 15, 2003 4:36 AM
Does the sreotta fit well? Seems like you might go two sizes smaller with the Peg and be O.k. The two sizes smaller will give you about what the serotta has for a top tube and have a lower center of gravity. This Fina is standard geomety ?
WRONG size...C-40
Jun 15, 2003 5:31 AM
You goofed big time. You must have totally ignored the "vertical size" of the frame when comparing dimensions, or you were sent the wrong size.

Have you measured the frame size from the center of the BB to the center of the top tube? That's how Pegoretti and Serrota are both measured.

If you can return it you should.

Vertically, the frame must be 4-6cm too large. Not even close to the proper size.

IMO, the minimum distance from the top of the top tube to the top of the saddle should be 15-16cm, measured near the nose of the saddle.
WRONG size...j-son
Jun 15, 2003 1:21 PM
Thanks for the words of advice. One problem I have always had is that my torso is long and my legs are short. So, whatever frame I ride tends to be tall if its is long enough, or short thru the TT if it is the right 'height.' A curse of my physiology, I guess. I did screw up big time on this frame though. I should have more carefully considered the geometry. I got in a hurry and let my emotions overwhelm my rational side.
a possible solution....divve
Jun 16, 2003 5:34 AM your case you might want to look at a frame with a sloping geometry. It will allow for a long top tube and maintain proper stand over height with a reasonable length of seat post showing. Deep inside we all strive for that ultimate effect:)