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6' tall...what's the right frame size?

138K views 39 replies 37 participants last post by  robt57  
#1 ·
I guess a totally newbie question...my current CAAD10 is 56cm as I listened to the bike shop...

As I do more and more research, I am starting to wonder if I should have gone with a 58cm. I am approximately 6 feet tall. When I ride my CAAD10, there are moments that I wish the bike is a bit taller, especially going uphill...may be it was really just my rookie legs that are giving up...

Your comments are greatly appreciated!
 
#2 ·
Don't worry about research and reading, you need to base the fit on first hand experience.

I am about 5'9" and I read I should be on a 53-54, but I ride 57, and it feels great. There is a lot of wiggle room in bike fit, we are only talking about a couple of cms and there are a lot more variables than height: aspect ratio, torso length, riding style, flexibility, etc...
 
#5 ·
summary of the longer answer...different manufacturers measure differently, top tube length is more important, some like "smaller" frames, some like "larger frames", not all 6' people have the same leg vs torso lengths, get a fitting (experienced eyes watching you ride is better data than you telling us how you feel) from a recommended fitter, when in doubt - and if it really bugs you- get on a custom builder's wait list who asks for your measurements, purpose and riding style.

(I'm 6', could ride "frame size" 55-61 depending on the bike and setup etc etc. Old bike is a 60, newer compact frames could be the 55. I currently would look more for effective top tube length of 58cm so I can adjust from there)
 
#8 ·
......different manufacturers measure differently, top tube length is more important,......, not all 6' people have the same leg vs torso lengths, get a fitting (experienced eyes watching you ride is better data than you telling us how you feel) from a recommended fitter,
Exactly.

A little longer seatpost and a longer/shorter stem makes frame size less of an issue especially if looking at a compact (sloping top tube) frame.

Extreme leg vs torso length issues can be an issue for sure, but I'm not sure what % of riders really have that situation.

So ideally you do use an experienced fitter.

Of course there are several on-line fit resources you could play with to see if you are in the ballpark.
 
#9 ·
Your 56cm Cannondale CAAD frame is too small. You need a 58cm Cannondale CAAD frame. I am 5'11" and ride 58cm CAAD frames. With 12cm stems. Setback seatposts. I use bikes with 57-57.5cm top tubes. The 58cm CAAD frame has 57.5cm top tube. At 6 feet, you will need a 13cm stem and plenty of setback to get properly stretched out. I bet you are riding the 56cm bike with a big hump in your back. Your back is supposed to be flat when riding, not round like a ball.
 
#10 ·
I got my first road bike last Saturday. I'm 6' 0" as well, and the salesman gave me a few bikes to try (one 54cm and another 57 cm). I, coming from mountain bikes, personally liked the 56 cm the best. Honestly, I couldn't tell a difference between the 56 and 57; however, the 54 made my arms in a odd and uncomfortable position.

If you're ok riding it then it's a good fit for you :D
 
#11 ·
Just go back to the LBS where they fit you, they did fit you right?, and tell them what is bothering you. A few measurements and they should be able to suggest a remedy-be it adjustment or part swap.

I am 6'2" and ride a 56, 57, 58 depending on brand but my torso is long, height is not the determining factor.

Good luck!!:thumbsup:
 
#18 ·
What is your inseam? I like standing over the tube of a 56" but like the feel of a 58" moving. I'm 6' with a 34" inseam. I think I will cycle-cross this fall and I will probably go with a 56".

I'm a noob so don't listen to me.
 
#19 ·
Despite the variations in body measurements, the majority of 6' tall people are best off on what would be considered a 58. Going by inseam or body length alone will play against a good fit, because someone with long legs is going to need a shorter top tube, but not a shorter stack. And someone with short legs needs the top tube length. Unless the person's proportions are so far off that they really need a custom, total height is one of the best predictors of frame size.

I've been doing this a long time, but now work at a shop that does the best fittings in the midwest. Our fitter starts with a blank slate, but I have yet to see someone who fits a stock bike and the size wasn't predicted by height. There are always exceptions, but those prove the rule, right?


I wouldn't use pros as examples of how to size a bike. Non-pros shouldn't be concerned with trying to find the lightest, shortest wheelbase, lowest stack frame they can fit on. Bikes fit that way are great for crits, not for all around use.
 
#29 ·
I''m 6' with a 32" inseam and slightly longer-than-average arms.
I'm 5'11.5" with a 32" inseam and longer than average arms and I ride a 54 cm frame with a 130 mm stem.

Everyone's built differently, so everyone should ride what feels comfortable and pay less attention to the measurements.
 
#24 ·
I'm 6'1" and shoot for a 57-58cm effective top tube and a 110-120mm stem. Like others said there is some wiggle room once you're in the right ballpark. Pro fitters can be really helpful, especially with things like cleat placement, stem length, and saddle height/set back, but fitting is more art than science.
 
#25 ·
As I do more and more research, I am starting to wonder if I should have gone with a 58cm. I am approximately 6 feet tall.
You can't answer that question just from your height. You could be 6 feet tall with long legs and a short torso, with medium legs and a medium torso, or short legs and a long torso. Each of these would lead to a different fit.

As others have said here, another variable is frame geometry. You can't reduce a frame to one measurement and the angles, ratio of seat tube to top tube, etc., will affect the fit. One company's 56 cm might fit you best, while another company's 58 might fit you best.

One thing I will say: unless you're really an expert cyclist, you probably won't notice the difference between a 58 cm frame and a 56 cm frame that the bike shop properly set up for you (raise the seat another inch, add 2 cm of spacers on the steering tube, and swap the stem for one that's 20 mm longer and presto, it's almost exactly like a 58 cm model).
 
#35 ·
Isn't the drop from the seat to the handlebars a problem for you? Your case interest me, because I'm in the same position, only moreso: I'm about 6'1", but the preliminary fitting at the bike shop had my inseam as 93.5cm (36.8 in). He recommended a large frame with a short stem, which seems similar to what you did. I'm only surprised your frame wasn't larger, because you mention having to use a longer seatpost. That's my concern, because the old mountain bike I'm riding now has the seatpost so ridiculously extended.