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perfect frame size

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perfect frame size

Old 06-20-10, 01:35 AM
  #1  
dooodstevenn
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perfect frame size

so i have decided to get a new carbon frame, and this time im not going to kinda guess my frame size. i want to try to find a perfect frame size, or as close to perfect as i can get it. correct stem length, etc. so im about 5' 3'' and my inseam is about 25 inches (not sure if i measured that correctly. did it myself) and im trying to decide what would be a better fit. i am currently riding a 50 frame and when i get off the saddle to stop i have to tilt the bike a bit so it doesnt hit me. and im deciding between a 44 or a 48 frame, since the manufacturer does not make anything else inbetween. i have also read that manufacturers have stopped using inseams as a measurement? also that reach is more important than the inseam because two people could have the same inseam but a significantly different reach. so any thoughts on how to decide? i am sure the "you just have to go and ride it to try for yourself" answer will come up, but i am ordering the frame online, and even if i were to go to a lbs i don't have id or a credit card to put up for collateral since my parrents are very much against me buying cycling equipment. and also saying i have to lose weight but at the same time, not supporting my cycling. (paid for all my cycling equipment so please no flaming) thanks ahead of time for any help
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Old 06-20-10, 01:39 AM
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competitive cyclist says i should be riding something in the 44cm frame area, but i have heard the site gives you smaller measurements for some reason. for example, your real frame size is a 50 but they tell you to get a 48
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Old 06-20-10, 03:59 AM
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competitive cyclist gives you a range of sizes, somewhat dependent on your riding style/preference. usually, the differences between the three fits are small enough that they do not span across more than 1-2 different "typical" frame sizes. pick the one that suits your style/preference the best.
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Old 06-20-10, 05:43 AM
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Grumpy McTrumpy
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where are you getting the 25"? that seems low.

Determine Your Proper Frame Size
To determine your proper frame size, you'll first need to get an accurate inseam measurement . Stand with your back against a wall, your bare feet 6" apart on a hard floor, looking straight ahead. Place a book or carpenter's square between your legs with one edge against the wall, and pull it up firmly into your crotch, simulating the pressure of your saddle while riding. Have a helper measure from the top edge of the book to the floor, in centimeters. (You can convert inches to centimeters by multiplying inches by 2.54.) Repeat two or three times, for consistency, and average the results to get your inseam length.

source
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Old 06-20-10, 07:24 AM
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I'm 5'3" and ride a 44 frame with a 50.9 effective top tube. My last frame was a 50 with I think about a 52 top tube and that just felt too big eventhough the LBS said it was perfect. A 44 should get you in the ballpark. Everything else like saddle height and stem length, etc can be bought or adjusted to fit.
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Old 06-20-10, 09:05 AM
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dooodstevenn
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the inseam is correct, i also had a friend help measure. i have straddled 48frames and it still hits.
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Old 06-20-10, 09:36 AM
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My wife is 5'2" and I got her a 650b.

She loves it, and the smaller wheels let the bike
have good geometry.
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Old 06-20-10, 09:55 AM
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i was thinking a 650 frame too..but where i live tubes and tires in the 650 size are hard to come by in 650. especially tires
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Old 06-20-10, 10:28 AM
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Rather than inseam, use your actual saddle height as an indicator of the proper vertical frame size. People with the same inseam could prefer a saddle height that differs by 2-3cm.

At your height, it would be rare where the appropriate frame size would not be the smallest offered.
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Old 06-20-10, 11:39 AM
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im trying to imagine a 44 frame on 700c wheels...looks funny
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Old 06-20-10, 01:58 PM
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Frame size also depends on your riding style and intended use of the bike. There's a good article on frame sizing/measuring from Rivendell Bicycle Works at
Bike Fit.
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Old 06-20-10, 05:48 PM
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so after reading the article i learned how to get a saddle height measurement, did that and got 22 inches as my proper saddle height, right now my saddle is all the way down and it is at 24 inches on a 50 cm frame

i want a 44 cm frame the 6cm differance is 2.4 inches thus giving me the 2 inches i need. does this sound right? if so im gonna pull the trigger on the frame.
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Old 06-20-10, 06:09 PM
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If you're looking for a carbon frame, I.E. moneys, then you might just go get professionally fit. If the bike doesn't fit, depending on the shop, they'll give you like a week to try another frame/size as long as the first one can be resold, IF they fit you. Like a fit guarantee. Even if they don't, you're likely to be fit well the first time anyway. Plus, when you start investing in more expensive bits and parts, its very beneficial to have a bike shop to go with them. When you start spending lots of money on bikes, don't think of it as on the bikes, but investing in whichever bike shop you get the best help at and like the employees the best, will make things in the future much easier, enjoyable, and smoother.
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Old 06-20-10, 06:12 PM
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well im purchasing the frame online, and stated above, if i were to go to my lbs i would have no collateral to try out a bike
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Old 06-20-10, 09:09 PM
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At 5'3" with a 25" inseam... a 48cm is probably going to be too big. My girlfriend rides a 48cm and she's 5'4" with 30" inseam. She seems to find fine on the 48cm bike (with 700c wheels)
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Old 06-20-10, 09:46 PM
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Originally Posted by dooodstevenn View Post
im trying to imagine a 44 frame on 700c wheels...looks funny
Sloping geometry, looks fine. Check out a Colnago size chart for their top frames.
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Old 06-20-10, 10:30 PM
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alright, thanks. i guess 44 it is.
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