Frame sizing help please- confused
05-28-12, 03:44 PM
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Frame sizing help please- confused
Needing a little help with some frame sizing.
I'll state first off I'm a newb, havnt had near any saddle experience on a road bike past a few parking lot tests. I mostly road 58cm bikes ( vaguely measured by inexperienced person based on a stand over). I tried a fuji 58 and 56. The 56 did feel on the cramped side but I only did a sit over, no ride.
Now to the part where I'm conflicted. I did a fit test at Competative cyclist website.
Results
Competative c-c 56, C-t 58, top tube 54.5
Eddy fit. C-c 57.5, c-t 59, top tube 54.5
French fit c-c 58-59, c-t 60, top tube 56
Confused because this is steering me towards much smaller bikes than a 58 typically.
I'm 5'11" with a 34" inseam.
What should I be looking At? Do I need to give the smaller frames a better shot here?
Edit: wrench science recommend s me either a 56c-c or a 58 c-t with a overall reach of 74cm and saddle hieght of 76cm
Edit: I also ask this because I'm currently looking at a good deal on a cannondale caad8 r1000 in 58cm. Butim wondering if I should let it go for possiblly being to big? Would be frustrating because I've lost out on three other bikes so far by being to slow to them lol. Cannondale measure c-t correct?
geometry for Cdale in this size indicate Top tube of 57.5
I'll state first off I'm a newb, havnt had near any saddle experience on a road bike past a few parking lot tests. I mostly road 58cm bikes ( vaguely measured by inexperienced person based on a stand over). I tried a fuji 58 and 56. The 56 did feel on the cramped side but I only did a sit over, no ride.
Now to the part where I'm conflicted. I did a fit test at Competative cyclist website.
Results
Competative c-c 56, C-t 58, top tube 54.5
Eddy fit. C-c 57.5, c-t 59, top tube 54.5
French fit c-c 58-59, c-t 60, top tube 56
Confused because this is steering me towards much smaller bikes than a 58 typically.
I'm 5'11" with a 34" inseam.
What should I be looking At? Do I need to give the smaller frames a better shot here?
Edit: wrench science recommend s me either a 56c-c or a 58 c-t with a overall reach of 74cm and saddle hieght of 76cm
Edit: I also ask this because I'm currently looking at a good deal on a cannondale caad8 r1000 in 58cm. Butim wondering if I should let it go for possiblly being to big? Would be frustrating because I've lost out on three other bikes so far by being to slow to them lol. Cannondale measure c-t correct?
geometry for Cdale in this size indicate Top tube of 57.5
Last edited by cazten; 05-28-12 at 04:18 PM.
05-28-12, 04:14 PM
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6ft with a 34 bike inseam.
60 cm for me.
https://i256.photobucket.com/albums/h.../Hawkiepic.jpg
https://i256.photobucket.com/albums/h.../9000mione.jpg
I have a large Cannondale T-1 and it is Too Small for my taste.
60 cm for me.
https://i256.photobucket.com/albums/h.../Hawkiepic.jpg
https://i256.photobucket.com/albums/h.../9000mione.jpg
I have a large Cannondale T-1 and it is Too Small for my taste.
__________________
Fred "The Real Fred"
Fred "The Real Fred"
05-28-12, 04:47 PM
#3
Senior Member
Forget about the term "frame size" entirely. If you're looking at brands that list the stack and reach, that's all you need to define the fit. Rather than inseam, which is often mismeasured, go by your actual saddle height, assuming that you have a bike with a properly adjusted saddle height.
As an example, if your cycling inseam (not pants inseam) is 34 inches or 86cm, then your saddle height should be around 76cm. From there, a saddle to bar drop range, and an appropriate stack height can be figured. A stack height of 555-560mm would provide a racing fit with a saddle to bar drop in the 7-11cm range, depending on the stem angle. If a more recreational fit is desired, then increase the stack height by 20-30mm.
If a brand does not list the stack and reach, then you can only compare head tube length and TT length, with corrections needed for any difference in the seat tube angle. Steeper STAs make the reach longer, by about 1cm per degree.
On pitfall to the reach concept is that it is only valid at ONE stack height. If you're comparing frames with different stack heights, then corrections must be made to the reach. A taller stack height reduces reach by about 3mm for each 10mm of additional stack height.
https://www.cervelo.com/en_us/bikes/2012/R3/geometry/
As an example, if your cycling inseam (not pants inseam) is 34 inches or 86cm, then your saddle height should be around 76cm. From there, a saddle to bar drop range, and an appropriate stack height can be figured. A stack height of 555-560mm would provide a racing fit with a saddle to bar drop in the 7-11cm range, depending on the stem angle. If a more recreational fit is desired, then increase the stack height by 20-30mm.
If a brand does not list the stack and reach, then you can only compare head tube length and TT length, with corrections needed for any difference in the seat tube angle. Steeper STAs make the reach longer, by about 1cm per degree.
On pitfall to the reach concept is that it is only valid at ONE stack height. If you're comparing frames with different stack heights, then corrections must be made to the reach. A taller stack height reduces reach by about 3mm for each 10mm of additional stack height.
https://www.cervelo.com/en_us/bikes/2012/R3/geometry/
05-28-12, 07:53 PM
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Forget about the term "frame size" entirely. If you're looking at brands that list the stack and reach, that's all you need to define the fit. Rather than inseam, which is often mismeasured, go by your actual saddle height, assuming that you have a bike with a properly adjusted saddle height.
As an example, if your cycling inseam (not pants inseam) is 34 inches or 86cm, then your saddle height should be around 76cm. From there, a saddle to bar drop range, and an appropriate stack height can be figured. A stack height of 555-560mm would provide a racing fit with a saddle to bar drop in the 7-11cm range, depending on the stem angle. If a more recreational fit is desired, then increase the stack height by 20-30mm.
If a brand does not list the stack and reach, then you can only compare head tube length and TT length, with corrections needed for any difference in the seat tube angle. Steeper STAs make the reach longer, by about 1cm per degree.
On pitfall to the reach concept is that it is only valid at ONE stack height. If you're comparing frames with different stack heights, then corrections must be made to the reach. A taller stack height reduces reach by about 3mm for each 10mm of additional stack height.
https://www.cervelo.com/en_us/bikes/2012/R3/geometry/
As an example, if your cycling inseam (not pants inseam) is 34 inches or 86cm, then your saddle height should be around 76cm. From there, a saddle to bar drop range, and an appropriate stack height can be figured. A stack height of 555-560mm would provide a racing fit with a saddle to bar drop in the 7-11cm range, depending on the stem angle. If a more recreational fit is desired, then increase the stack height by 20-30mm.
If a brand does not list the stack and reach, then you can only compare head tube length and TT length, with corrections needed for any difference in the seat tube angle. Steeper STAs make the reach longer, by about 1cm per degree.
On pitfall to the reach concept is that it is only valid at ONE stack height. If you're comparing frames with different stack heights, then corrections must be made to the reach. A taller stack height reduces reach by about 3mm for each 10mm of additional stack height.
https://www.cervelo.com/en_us/bikes/2012/R3/geometry/
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