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Just bought a new bike... Right size or go bigger?

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Just bought a new bike... Right size or go bigger?

Old 04-28-09, 12:22 AM
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dinandriver
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Just bought a new bike... Right size or go bigger?

Hi everyone, I'm new to the site! I'm just now getting back into cycling so I went out and bought a Specialized Allez Double at one of the local bike shops here in the Southbay area. Anyway, the day I came in all the store had was a 54cm frame that was put together and told me that it was the right size for me. After talking to a few riders I came across just ridding around, they seemed to think that I could have gone to a 56cm frame... I brought the bike back and they put a longer stem. I'm exactly 5'9"1/2 with a 32' inseam. What do you guys think? Should I go back and get the 56? Thanks in advance!
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Old 04-28-09, 12:34 AM
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Sounds a reasonable size.

Last edited by unbelievably; 04-28-09 at 01:35 AM.
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Old 04-28-09, 12:37 AM
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Rule of thumb the 54 is better for you than a 56.
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Old 04-28-09, 12:42 AM
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I've got about the same measurements and I feel better on a 56.
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Old 04-28-09, 12:45 AM
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Sounds right. I'm 5'11" and 56 fits me fine on my Specialized.
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Old 04-28-09, 01:20 AM
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dinandriver
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Thanks Mongo, so why is it that the smaller frame be better? That's good news for me...
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Old 04-28-09, 01:23 AM
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You don't fit a frame just by height; without pictures of you on the bike, there's no way to tell if it's a good fit or not.
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Old 04-28-09, 01:28 AM
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Originally Posted by dinandriver View Post
Thanks Mongo, so why is it that the smaller frame be better? That's good news for me...
Smaller frame has shorter tubes, and thus is lighter, has smaller front triangle and head tube and thus stiffer, and a shorter wheelbase and thus quicker handling.

You can't shorten a top tube or lower the bars below the headtube, but a change of stem will allow you to make a smaller frame fit the same as the next size up.
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Old 04-28-09, 01:39 AM
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dinandriver
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Toda snotrockets! I'm guessing you speak Hebrew
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Old 04-28-09, 01:40 AM
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dinandriver
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And yes I have to get some pictures...
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Old 04-28-09, 08:40 AM
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Originally Posted by snotrockets View Post
Smaller frame has shorter tubes, and thus is lighter, has smaller front triangle and head tube and thus stiffer, and a shorter wheelbase and thus quicker handling.

You can't shorten a top tube or lower the bars below the headtube, but a change of stem will allow you to make a smaller frame fit the same as the next size up.
Yes a longer stem will create the same fit but it also moves your weight forward which affects the bikes handling. This change in weight distribution may be for the better or for the worse.

Best is to have a fitter with experience look at you on the bike.
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Old 04-28-09, 08:48 AM
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Originally Posted by snotrockets View Post
You don't fit a frame just by height; without pictures of you on the bike, there's no way to tell if it's a good fit or not.
No doubt. I'm 6'1, all torso and no legs. I ride a 56, am comfortable on a 55. Fit fine on most 58s with some setup. Fit depends on so many things...
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Old 04-28-09, 08:54 AM
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Changing stem length does NOT alter the weight distribution significantly. A smaller frame might have a shorter F-C that increases the weight on the front. The only other things that significantly affect weight distribution are saddle fore/aft position and torso angle.

At your height and inseam (if it's a cycling inseam, not pants) the 54cm is plenty large enough. With an 83cm inseam and 73 cm saddle height, I'd choose a 52.

http://www.specialized.com/us/en/bc/...9Allez&eid=115

Last edited by DaveSSS; 04-28-09 at 11:01 AM.
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Old 04-28-09, 09:02 AM
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You should be fine on the 54. All that really matters is if you are comfortable.

For comparison, I'm a tad over 5'10" and am all legs. I have a 56 Specialized and a 56 Cannondale. Both have 100 mm stems.

My wife, who is a tad under 5'10" tall and is mostly torso, rides a 54 Specialized, also with a 100 mm stem.

I have ridden and raced her bike - mine were down for a while and one race included a massive, 17 percent climb and she has a triple. I can fit on her bike fine, though I prefer the fit of my bikes.
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Old 04-28-09, 11:41 AM
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I'm guess I'm the odd ball but I hate being cramped and sitting upright. I'm slightly over 5'10" and on average prefer a 58cm frame. Of course it depends on how it's measured too. If I get a 54cm frame then I have to have a skyjacker seat post.

To me a 56 and 58 are medium sized frames. Getting into 52 to 54 is small. going into 48-50 is extra small and damn near requires 650c wheels. My wife is 5'3" and rides a 51. That thing feels like a clown bike to me. I couldn't imagine riding that further than a couple miles.
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Old 04-28-09, 12:06 PM
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Thanks everyone! I'm heading out this afternoon on a long ride (long for me... 15 miles). I should know when I get back how the bike feels. FYI I have a 12cm stem on ther know and do feel a tad stretched.
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Old 04-28-09, 12:15 PM
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size does matter

i have a 56 felt f75 iam 5-11 32'' inseam tried a 54 but did not feel the same go try a 54 and see which feels the best good luck
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Old 04-28-09, 01:10 PM
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Originally Posted by dinandriver View Post
Thanks everyone! I'm heading out this afternoon on a long ride (long for me... 15 miles). I should know when I get back how the bike feels. FYI I have a 12cm stem on ther know and do feel a tad stretched.
120mm stem is a reasonable length stem, toward the long end of the typical range. If that's too stretched out for you, you might go to a 110mm, and 110 is just about in the middle of the range of typical stem lengths.

Thus if the bike fits you with a 110-120 mm stem, you likely are on the right size frame.

Looking at the alternative if a 54cm frame, 110 stem fits, then you'd likely need a 90mm stem on a 56cm frame, and that's starting to get to the short end of the range of stems.
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