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In all seriousness some of it is preference and some fit. Your overall height has less to do with it than your leg length or stand over and your upper body will depend on TT+stem and fore/aft position of seat. Of course how you play with these can affect comfort and handling which is why everyone will tell you to get properly fitted. I am 5'9 and my bikes are a 53 and a 54 (both standard geometry)
 
Hi guys noob here. Finally found the appropriate thread. I have kind of the same dilemma on my recent first road bike purchase. I'm 5'7.5 with inseam of around 30.5', and most online calculators put me on a 51-52 frame. Got a good deal on a cdale caad9 size 50 at a local lbs (50 and 54 only available). Great bike, overall fit felt ok and rode it long for a day and had issues with bad toe overlap. (i've read about it thoroughly and said it isn't really a big deal but for me it was). Aesthetically, didn't like the overall look of the 50 frame bike as well, twas like a lowrider, not a proper race bike stance IMHO only. Anyway to make the long story short, had it changed to the 54, rode it around the lbs and felt ok except had to reach for the brake levers a lil bit. Components are being exchanged so my bike would be not be ready until some few days.

I don't know if the 54 frame bike is too big for my aforementioned size eventhough it felt good (albeit short distance only).I know the 52 would probably be the best but not available. I very much would like to stay at this particular model even if the lbs guys wants me to go for a 51 on another model. I'm also worried that adjustments with both handle bar stems and saddle heights etc won't be enough. Sadly, there's a lot to be desired in terms of customer care at that lbs and professional fitting was not done/offered but the price and the bike was a major steal. Would welcome any comments. Also, if there are other guys out there who ride bikes a size or two bigger for some reason, how does it feel, any major issues etc. I'll keep you guys posted what happens.
 
True have to consider that as well. You see I'll proly be doing mostly short fast rides as I do mt biking more.It was a different model (c'dale synapse alloy) and I liked the firm/light/racier feel of the caad, it had lesser componentry (tiagra vs 105) and lastly, really didn't like the color scheme available. Kind of silly but hey i gotta like how it looks too before i buy hehe..just wanting to know if i could make the 54cm fit better through other means. I guess will know in a few days when i get the bike and do adjustments with them
 
You can probably make the 54 fit better, but you risk screwing up the handling.

Basically the same deal as sticking too short a stem on a mountain bike.
Thanks for the advice at least I know I can make the 54 work. Hopefully everything goes well once I get the bike. As a noob road biker I feel handling wouldn't be significant yet.

I'm also thinking as I ride more my body would adjust(?)..The waiting is killing me though I wanna ride! :cryin:
 
If anything, handling is more significant.

I think that it's to do with the length of the stem. Another poster here, who I respect, thinks it's to do with weight distribution, and the length of the stem is just a secondary effect.

The bottom line, though, is that on too big a bike, either because the front wheel is too far away or because of a change in the angle of force transferred from the handlebars to the steer tube, the handling is twitchy and a moment of inattention or a second guess in a corner has greater consequences. Doesn't mean you'll fall, but you'll have to pay more attention.

IME, 90mm stems are fine and 80mm stems are not.

Ultimately, you're the one who has to be satisfied one way or the other. See if the shop will put on a smaller stem. See what you think.
 
I didn't find my bike became unridable when I tried an 80mm stem. It was just less stable than I wanted. I also wouldn't be surprised if where the threshold is has to do with a person's proportions, etc. Bike stuff is almost never clear-cut. :p IMO, it's worth making a few phone calls, though, and seeing if someone has the bike you want in a 52 and checking out some other brands. Pre-orders and high-end bikes are one thing, but if a shop doesn't have a certain mid-priced bike in storage, I'm disinclined to believe they can get it.
 
Thought I'd give an update. Didn't push through with the bike, didn't like making the bike fit me so instead I waited for a special order for a bike of my size..2012 CAAD 8 compact! Road it around the shop and WOW. Very fast, responsive and light just like the CAAD9. Completely redesigned frame sold me (10-speed tiagra, BB30, SavE) and the color scheme. So glad I waited..can't wait to put miles on this baby...btw all reflectors, dork disk etc will be removed as required:)
 
I have a different take on this thread after taking some test rides today. All prior rides had been on 54's (I'm 5'8" w/32 inseam) and today's rides were Small (Wilier GT) and 51 (Cervelo RS & R3). These bikes felt VERY cramped, especially when out of the saddle. On the GT, I kept banging my knee on the handlebars when clipping in or out (ended up with swollen knee). My feet would actually hit the front tires on some turns.

They did a quick fit with some spring-loaded device and that was it. When I mentioned the R3 feeling cramped, they wanted to change the step. When I mentioned the size difference, he kept saying to himself softly that the 51 was the "right" size.

the other thing that I had to check was the geometry of these different sizes as the GT bothered a bad elbow.


Steve
 
I am also 5'7.5". I rode a 54 for years, but it was a pain (on my back :wink5:).
I changed to 50cm and I really like it. I like the shorter reach exchange for more drop. That being said I am not very flexible with short arms and an overall bulky build.
Everything will fit different, you can grab a shorter stem etc. to help with the fit, but it sounds like the 51cm felt the best.

By the way, at 50cm, my bike looks freakin' sweet.:D
 
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