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Need help with compact frame sizing

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Need help with compact frame sizing

Old 05-16-05, 10:12 AM
  #1  
PixelPaul
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I'm confused about the sizing of compact frames and receiving conflicing advice. Hoping someone who has more experience bike fitting can help. Here are some of my measurements using the wrenchscience website:

Height: 67"

Sternum notch: 55.5"

Inseam length: 31.75"

Arm length: 27.125"

Weight: 145 lbs

Based on this information and the chart below, what would be my ideal frame size? A few people have suggested a MEDIUM, but I got an email from the factory and they say SMALL. I have had others say that sizing isn't as big a deal with compact frames - use a longer seatpost ot stem. Any input would be most helpful.
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Old 05-16-05, 10:51 AM
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biker7
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Paul,
Though your intentions are in the right place, it is real tough to say definitively which frame you should purchase. BTW..what kind of frame is it?...top tube lengths are relatively short relative to frame height for that mfr. If you want to subject yourself to the forthcoming onslaught of debate and assault as there will be no consensus...post more information....crunch both the Wrenchscience and CompetitiveCyclist's programs and post all the numbers. This will help. Is it absolute?...nope because personal preference in terms of reach in particular comes into play. Also, experience with previous bikes is a huge asset in deciding the best frame that is right for you...if you have that experience. Even long time cyclists are forever tuning and fretting about ideal frame size.
Good Luck,
George
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Old 05-16-05, 10:59 AM
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sydney
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Originally Posted by PixelPaul
I have had others say that sizing isn't as big a deal with compact frames - use a longer seatpost ot stem. Any input would be most helpful.
That's nonsense.You also have to consider TT length and ability to get the bars high enough.And you can only do so much within reason with a stem.
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Old 05-16-05, 10:59 AM
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There really is no way to answer your question with the information provided. Too many other variables come into play - no one here knows how flexible you are, how high you want your bars, what your saddle fore/aft should be, how you like to ride (upright, flat, etc.)

On the one side, there are fit experts that use measurements to get you onto the ideal frame holding things like stem and seatpost extension constant.

On the other side, there are fit experts that start with a ballpark frame size and vary seatpost extension and stem length to get you fit to their liking.

The only way for you to know is to sit on the bike and decide what feels right. In order to decide what bike to buy without doing that activity, you have to have a solid understanding of what you need from a geometry perspective. And it sounds like you don't.

Get some LBS fit help, in person. Any framesize advice (especially when it comes to compact) you get here is going to apply to the person offering it, not you.
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Old 05-16-05, 11:00 AM
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sydney
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Originally Posted by Trogon
There really is no way to answer your question with the information provided. Too many other variables come into play.

On the one side, there are fit experts that use measurements to get you onto the ideal frame holding things like stem and seatpost extension constant.

On the other side, there are fit experts that start with a ballpark frame size and vary seatpost extension and stem length to get you fit to their liking.

The only way for you to know is to sit on the bike and decide what feels right. In order to decide what bike to buy without doing that activity, you have to have a solid understanding of what you need from a geometry perspective. And it sounds like you don't.

Get some LBS fit help, in person.
What he said.Except beware of LBS 'fit experts' that really aren't. I know, tough call,but there are alot of nose pickers masquerading....
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Old 05-16-05, 11:38 AM
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PixelPaul
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Thanks for all the replys. I agree ideally the best situation would be to ride the bike, but it is a frame for sale and not built up. They have a Small and Medium available and I'm trying to make the best decision possible. Somebody suggested the Competitve Cyclist and Wrenchscience fit calcualtors, and here are the results:

Competitve Cyclist
---------------------
Seat Tube C-C: 53-53.5
Seat Tube C-T: 56-56.4
Top Tube: 56-56.4
Stem Length: 11.2-11.8
BB-Saddle Position: 73.9-75.9
Saddle-Handlebar: 54.2-54.8
Saddle Setback: 4.2-4.6

Wrenchscience:
------------------
Overall reach: 68.135
Frame Size: 55C-T or 53 C-C
Saddle height: 72.05

Not sure if this helps at all. Somebody had asked what brand, it is a Wilier. Thanks again.
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Old 05-16-05, 12:00 PM
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I don't think riding it is important - in my view test rides are a complete waste of time.

What's important is sitting on something with a similar geometry. And all that really matters is where the bars fall (height), the reach and where you end up sitting with respect to the center of the BB.

It doesn't have to be the same frame, just one with similar dimensions.

I read the responses you received over on RBR - not bad advice, but again no one knows how you're going to feel bent in half or all stretched out or however you might end up.
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