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57 or 58 Fit Question(12 posts)

57 or 58 Fit Questionbikeid123
Aug 22, 2003 6:27 AM
I am trying to decide between a 57 and a 58 Specialized s-works frame.
The seat tube, top tube, and head tube on the 57 is 530, 570, and 160. For the 58 they are 540, 576, and 170. The head and seat angles are the same. I think that either would fit, but I am worried about the stack height being too high on the 57. It may be unlikely, but I am concerned about excessive flexing/strength of the carbon steerer. This bike is going to be used for recreation/exercise and will be ridden around 1000 - 2000 miles a year. The bike I currently ride on the road is a hybrid with a seat to bar drop of about 1/2". I do not anticipate being able to increase my drop, and I am wondering if I am "stretching" the fit limits of the 57. I am 6' 1 1/2" (187cm), I have a 34" (86.5cm) biking inseam, and weigh 200lb. I've seen this issue discussed before, but was just wondering if anyone had any insight into my specific situation (similar height, inseam, bike frame, etc.) My only biking experience is on a road oriented hybrid (cosmic elites, drop bars) and a full suspension mtn bike. I do not have any experience fitting a road bike, so any suggestions would be greatly appreciated.

Aug 22, 2003 6:49 AM
I'd get the 58- the only way I'd even consider a 57 is if the top tube was significantly longer than the the seat tube. Are there no built bikes to test ride? Even in a different model that shares the same geometry?
Ditto the 58.KG 361
Aug 22, 2003 6:53 AM
I also agree that you should see if they have a bike that is comparable that you can ride. I ride a 57 and am just shy of 6' tall and my cycling inseam is about 33 inches, FWIW.
Aug 22, 2003 6:59 AM
I am 6' with a 34.5 inseam. I ride a 58 c-c and have ridden larger bikes in the past. With the shallow amount of drop you want, I would say a 58. This is a very nice frame but riding 1-2000 miles a year is not a lot. Have you considered one of the Allez models? They may be priced more appropriately for this kind of use. Best wishes.
Aug 22, 2003 7:02 AM
I held my tongue... but when he buys this frame, he'll be riding 1000 miles/month before he knows it... he doesn't know what he's getting himself into.
Allez very nice in steel, comfort should be considered IMO nmSpunout
Aug 22, 2003 7:20 AM
re: 57 or 58 Fit Questionbiggearlover
Aug 22, 2003 7:30 AM
By the look of it, you'll need a 58 cm, assuming it's center-top measurement. By comparison, my height is 1.84, inseam 85 cm, weight 170. I ride 58 c-t, with 56 toptube, which could be 56,5 to suit me a little better. 120 mm stem.
My bars are pretty low, more the race outfit, although I seldom ride down in the drops anymore. Still a very comfy setup, for me.
If it's your first roadbike, you'll have to allow a period of I'd say two years to find the best setup for you, and to get your body to adjust to this new way of physical excercise. You should try some out at least, before buying. I started with a 61 c-t, then a 59, and now, the past 15 years, 58. Maybe the next one is a 57!
re: 57 or 58 Fit Question; correctionbiggearlover
Aug 22, 2003 8:56 AM
Excuse me bikeid123, I got confused with the numbers; taking my bike as reference you'll need a 60 cm c-t, and considering the more recreational use, possibly a 61. Try it out at a bikeshop is the best you can do.
You need to ride to decideMel Erickson
Aug 22, 2003 8:27 AM
Or at least talk to a LBS that has experience fitting this bike. Given your measurements (almost exactly mine, save the weight which has little to do with fit) I would even consider the 61. Too bad there's such a big jump in their sizing (58-61). It's really unclear what their effective seat tube sizing really is. A 594mm top tube on the 61 could very well stretch things out too much but a 576mm (58) could be a little tight. A 57 is too small, IMHO.

I encourage you to ride some comparable bikes (Allez is sized comparably in the 58 and 61) to find out what works best for you.
re: 57 or 58 Fit QuestionPMC
Aug 22, 2003 10:53 AM
Both of those sizes in the S-Works have pretty short headtubes, if you factor in the integrated headset, for a guy your height.

I'd hit a Specialized dealer and test a Allez Comp or Pro in a 58 to give you a better idea on fit.

I'm 1/2 inch shorter than you (but inseam is 1.25 inches longer) and wouldn't consider a 57 in that frame.
Expect Problems...C-40
Aug 22, 2003 12:23 PM
Neither of these frames really has enough head tube length for someone who cannot tolerate a substantial drop from the saddle to the bars. Frames with conventional headsets would have a headset & headtube length in the 180 to 190mm range.

To have any hope of getting the bars up to the desired height, you would have to have a very high rise stem. You do not want to use a big stack of spacers to raise the bars.

This bike would produce a saddle to bar height difference of about 7cm, or almost 3 inches, with 2cm of spacer and an 84 degree stem. To reduce that drop to 2cm or less, would require about 5cm of additional stem rise.

A 73 degree stem flipped upside down would provide the necessary rise, but even a 130mm length stem will only have a horizontal reach of 107mm, once it's flipped. You may need the very longest stem available.
re: 57 or 58 Fit Questionbikeid123
Aug 22, 2003 1:14 PM
Thanks All, that's kind of what I thought. I have rode the 58 allez, and I did like it. I hadn't noticed the differences in the head tube between the allez and the s-works. I didn't know how much difference there would be going just 1cm down, but since the head tube is shorter on all of the s-works versus the allez, the allez may be the way to go. The reason I was looking at the s-works to begin with though, is because I liked the allez. The allez frames that I have seen for sale are often equal to or more expensive than the s-works.
Thanks again for the input!