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54cm vs 56cm

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54cm vs 56cm

Old 03-17-09, 11:15 AM
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I've been sized on a 54 for cx and road, but ride a 56 roubaix because I have a long torso. Since the synapse has a similar geometry to the roubaix, what you're saying makes sense.
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Old 03-17-09, 04:39 PM
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I'm about the same size, 5'8", 32" cycling inseam. I'm most comfortable on bikes 52 to 54cm. YMMV
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Old 03-17-09, 04:42 PM
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Originally Posted by yogi13
Suggest you go through the measurement process and fitting program on the competitive cyclist or wrench science sites and use that as a basis for comparison with the geometry of the bike you're looking at. On the competitive cyclist site, I'd probably use the "Eddy" fit.
Yes. Yes. Yes.

Using height or inseam alone, or even both is not what you need to do.
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Old 03-17-09, 06:07 PM
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Originally Posted by wcoastbikr
I'm about the same height/inseam as you. I wish I had gotten a 54. I feel too stretched out, I have my saddle slammed all the way forward, and have to put 20mm of spacers under the stem(100mm) to keep my back from killing me on longer rides.

I can't afford to buy a new bike/frameset now, so in the meantime I'm thinking about getting a no offset seatpost and a 90mm stem.

My next bike will be a 54.
Are you trying to adjust the reach to the handlebars by putting your saddle forward? That is the wrong way to adjust things. You should adjust your saddle positon to get your positon over the crank spindle correct (start at KOPS, adjust forward or rearward depending on taste), THEN adjust your reach with the stem and/or changing bars. You can easily go to a shorter 90 or 80 mm stem and maybe find some shorter reach bars also to make that bike fit better. Definitely can get those new parts for less than $100 for top quality, more like less than $50 for good mid range stuff. Don't let anyone fool you, 80mm stems have perfectly fine handling.
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Old 03-17-09, 06:55 PM
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I'm just over 5'10" and have a 30" inseam. I have a long torso and short legs. I use a 120mm stem on my 56 Madone 5.5 pro. This model has a shorter head tube than the other 5.5. Given my long upper body, I need the extra length. I was fitted between 54 and 56. I rode the 56 (I had a 54) and felt comfortable so went with the 56.
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Old 03-17-09, 07:45 PM
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I'm 5'8" - 32.5" and ride a 54 x 54.5 and a 55 x 54.5, both fit OK.
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Old 03-17-09, 07:57 PM
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I'm 5'6.5 and have a 32" inseam and am struggling with this as well. LBS fitted me smack in the middle of the 53cm and 55cm Gary Fisher ARC Super frame. We're going with the 55. I'm a little worried, but he thinks I'm going to prefer the length and more relaxed geometry. The 53 head tube would drop me quite a bit over the 55. He also said the bigger frame would keep my center of gravity lower, aiding in stability. (I'm a new rider, if you can't tell already).
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Old 03-18-09, 12:00 AM
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I'm amazed that no one has brought up the fact that different bike manufactures all use different geometry; hence, frame sizing is a good guideline, but certainly it can't be compared across makes.

For instance, in a (new) Trek Madone, I felt most comfortable on a 58cm. I'm ~5'11". However, on a Cannondale, depending upon the model, I'm a 54-56cm.

Sloping top-tube, virtual vs. actual size, etc. All of these need to be taken into consideration.
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