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Should I select frame based on seat tube or TT size

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Should I select frame based on seat tube or TT size

Old 04-27-09, 02:04 PM
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aca
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Should I select frame based on seat tube or TT size

I am going to buy Look 565 frame but I have some concerns about frame size.

My inseam is 81cm, which gives 53cm seat tube or size M frame.

On the other hand I am 168cm tall, 63cm arms - so I have to use very short steam to get proper reach since top tube for M frame size is 545. So, based on torso height I suppose to pick S size.

Any recommendation what size should I select?
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Old 04-27-09, 02:19 PM
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Do you have a bike at the current moment? It would help to know its complete geometry plusthe stem length/rise, seatpost setback, saddle setback, seatpost extension. Only from that would it be possible to tell the correct size for you, other than you just getting on the bike and test riding it.
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Old 04-27-09, 02:41 PM
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I attached frame geometry. Don't have bike yet, I suppose to pick-up the frame in a couple of days.

My geometry
Height
167.00 cm
Sternum notch
138.00 cm
Inseam length
81.00 cm
Arm length
63.00 cm
Shoulder width
44.00 cm
Flexibility
6
Weight
63.00 kilo
Attached Files
File Type: pdf
geometrie585.pdf (80.3 KB, 11 views)
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Old 04-27-09, 02:44 PM
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Standover height is irrelevant, top tube length is the key.
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Old 04-27-09, 02:46 PM
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Do you really want strangers on the internet telling you want size frame to buy based on some numbers. You are going about this all wrong.

Put the bike on a trainer with a qualified fit expert and go from there. This is the only way to buy a bike (especially an expensive one).
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Old 04-27-09, 02:51 PM
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If you don't have a bike yet, I highly recommend test riding any bike before you buy it, and buying it from a store that will offer a comprhensive fitting after you buy it.
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Old 04-27-09, 05:25 PM
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I look at toptube first, but, seattube and headtube are also considerations.
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Old 04-27-09, 06:57 PM
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I agree with urbanknight, don't make a really expensive mistake. Get a fitting.
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Old 04-27-09, 07:08 PM
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Originally Posted by cdubb View Post
I agree with urbanknight, don't make a really expensive mistake. Get a fitting.
Thank you. I should mention that I bought 3 frames in 3 years due to a lack of education in frame geometry and some oddly proportioned legs.
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Old 04-27-09, 08:26 PM
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And, of course, some oddly proportioned hair.

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Old 04-27-09, 08:51 PM
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Originally Posted by mkadam68 View Post
And, of course, some oddly proportioned hair.

As you would imagine, my students love that picture.
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Old 04-27-09, 09:33 PM
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Originally Posted by jrobe View Post
do you really want strangers on the internet telling you want size frame to buy based on some numbers. You are going about this all wrong.

Put the bike on a trainer with a qualified fit expert and go from there. This is the only way to buy a bike (especially an expensive one).
+1
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Old 04-28-09, 06:45 AM
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Do you really want strangers on the internet telling you want size frame to buy based on some numbers. You are going about this all wrong.

Put the bike on a trainer with a qualified fit expert and go from there. This is the only way to buy a bike (especially an expensive one).
It's not wrong at all.

Purpose of this exercise is to save time and hassle.

Of course I am going to do proper fitting and for that I need complete bike. But it's much easier to switch the steam or to adjust the seat back or forth than to move components from one frame to the other in case of incorrect frame size.

If I get right frame size from the beginning from someone who has more experience in frame geometry and body proportions that would be great.
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