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This bicycle is what size ?

Old 06-04-12, 04:18 PM
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Savagewolf
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This bicycle is what size ?

I was hoping some folks could help me out to make sure I'm doing my math correctly. I've been looking at a bike and I've seen a lot of pictures and am satisfied with what I see. The seller, however, I believe doesn't have a size that I'm familiar with for the bike but was able to give me some measurements.

From the crank to the top of the seat tube is 21", the wheels are about 27" and from the ground to the top of the handlebars (yes, I know that really doesn't help much due to stem size/angle/etc) is about 36". The tube does seem to have a good size angle to it, almost forming a V from the BB with the saddle not being over the crank (Saddle looks centered on seat post, front tip of it would be directly above the BB).

Going off the measurements of the seat tube, I am guessing that would mean that the bike is a 53 or 54cm. Am I correct in this math ? I thought I was right, but the owner says he's 5'8" and the bike is too big for him. That seems a bit off to me as the measurements seem like it would be a smaller bike.

Thanks for the help, guys.
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Old 06-04-12, 04:34 PM
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What brand and mode of bike? Mountain and hybrid bikes are often sized in inches. 21" is a common size. And a 21" mountain frame would be way too large for someone 5' 8".
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Old 06-04-12, 04:34 PM
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IF his dimensions are accurate it is a 53/54cm frame. I have no clue how the 5'-8" owner is built. Some people have a very long torso with short arms and legs, others like myself have long arms and legs compared to torso size. The fact that the nose of the saddle is behind the crank means either it is a crank forward bike or that the saddle is shoved way back on the seat post. FWIW my City Bike has a ground to handle bar measurement of 58" which doesn't mean much except I have it set up for some serious upright riding and it is a HUGE frame with 700c wheels.

Type of bike comes into to play too. Given it has 27" wheels I would have to assume a basic ten speed or possibly a city bike of some sort.

Aaron
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Old 06-04-12, 04:42 PM
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the guy aint got a tape measure..?

A standard measure:

CL of BB axis, to Top of top tube.. or CL of top tube + 1/2D

but if the TT is not Horizontal that means you need slope described..
& top tube virtual length as if it were horizontal.
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Old 06-04-12, 05:54 PM
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Originally Posted by wahoonc View Post
...FWIW my City Bike has a ground to handle bar measurement of 58" which doesn't mean much except I have it set up for some serious upright riding and it is a HUGE frame with 700c wheels.

Aaron
Aaron, your arms must be as long as an orangutan's to reach bar that are 58" off the ground. Are you sure you didn't mean 58cm?

edit: 58cm is 22" so that can't be correct....so????

Last edited by ratdog; 06-04-12 at 06:35 PM.
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Old 06-04-12, 07:16 PM
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Originally Posted by ratdog View Post
Aaron, your arms must be as long as an orangutan's to reach bar that are 58" off the ground. Are you sure you didn't mean 58cm?

edit: 58cm is 22" so that can't be correct....so????
Seeing is believing....(I lied they are actually 52" with the wheel sitting on the ground ) The frame measures out to 25" seat tube and a 23"+ top tube. I am 6'-2" with a 34" inseam and a 36" sleeve length, and have a hard time getting bikes to fit. This bike pictured is a Redline R530 in the XL. I believe they only made it for 2-3 years and only made the XL for 1 or 2 years. FWIW most of my road frames are in the 64/65cm range. Those are 700c wheels on that bike, look kind of small...

Aaron

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Last edited by wahoonc; 06-04-12 at 07:24 PM.
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Old 06-04-12, 07:34 PM
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Thanks for the help, guys. The bike is a Lotus 3000R road bike. I like the looks of it and it seems in good shape, I just can't see the size being big enough.
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