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Anyone ride a 50cm IRO Mark V?

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Anyone ride a 50cm IRO Mark V?

Old 10-21-08, 11:04 PM
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Mxhunter
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Anyone ride a 50cm IRO Mark V?

Hey, was wondering if anyone here owns a 50cm iro fixie? I don't know whether I should go for the 53 or 50... I'm 5'5 1/2". I heard the 50 had slanted top tubes as opposed to horizontal which I don't want... but i don't want a frame too big for me obviously. but it's better than being cramped, etc. =(
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Old 10-21-08, 11:06 PM
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brandonspeck
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what is your inseam?

Make sure your inseam is an inch or two bigger than the standover height. that usually works for me.
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Old 10-21-08, 11:08 PM
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I'm 5'8" but i've got short legs so I ride a 53 mark v even though my junk like just hits the top tube when i'm standing over it.
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Old 10-22-08, 12:18 AM
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If it helps, I'm 5'8" with a 31 inch cycling inseam. I have about an inch of room between my crotch and tt. I'm thinking of swapping to a 50cm frame when my lbs gets one as I feel that the 53 is a little big for me.
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Old 10-22-08, 02:28 AM
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Mxhunter
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Wow, 50cm as 5'8? MMmm, I guess my question has been answered.
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Old 10-22-08, 12:26 PM
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ahand
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my friend is 5'5" and rides a 50cm angus.
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Old 10-22-08, 12:40 PM
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Stand over height (inseam) and your total physical height aren't the only issues.

Top tube length (reach) is just as important, as you can have two people with the same height, but have different leg/arm/torso reach.

Here is something I posted for another user regarding an Alien, but same issue

Originally Posted by JaeOne3345 View Post
I suggest you print out the geometry specs of the Alien Frame, take them to a local shop, and sit on bikes. Find a bike that has an EFFECTIVE top tube length (because so many bikes have compact geo now) that works for you, and choose the Alien which has a similar effective top tube length.

I know plenty people who based their bike simply on stand over/inseam and they ended up with a bike that was actually stretched out too far, or had them too crunched up.

For example, I usually ride a 50-51 cm seat tube bike as long as it has the common 52ish (520mm) top tube length with a 90mm stem. I could never ride a Leader 51 because their 51 is made with a 54.6cm top tube length. Yea I could run a 70mm stem as opposed to 90, but that's a band aid fix. See what I mean?

Hope I don't sound condescending or rude. Just trynna explain how seat tube length isn't the by all end all equation to sizing an off the shelf frame.

Have you played with any fit calculators to see what they have to say?
Tiemeyer Cycles, Wrench Science, and Competitive Cyclist all have calculators that will give you some BALLPARK ranges that shouldn't be taken as gospel, just for comparison. I haven't used the CC fit calc but Tiemeyer and Wrench Science, incorporate torso and arm length in addition to leg inseam.

I am pretty average in terms of body proportions so the bike I have now actually falls into what both wrench science and tiemeyer recommend for someone with my measurements. I was surprised it was fairly close
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Old 10-22-08, 10:23 PM
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i ride a 53... and the top tube slightly tilted (not horizontal). just letting ya know!
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