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First fixed gear purchase

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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

First fixed gear purchase

Old 03-11-12, 09:21 PM
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First fixed gear purchase

Looking at getting my first fixed gear bike mainly for recreation. Would just like a bike to hop on and ride and not worry about gearing up, already have a road bike.

I have read on this forum people think very highly of the kilo tt. Was thinking about getting that bike, but then on my local Craigslist there is an Iro Mark V in a size 56 available. Here's the the link:

https://southjersey.craigslist.org/spo/2877887548.html

I'm 5'9" and am just wondering if the 56cm will fit, have read that there sizes run smaill. Other than that I guess I just want to know if this is a good buy or not and if I should stick with the Kilo TT or some other recommendation.

Was going to order an Iro Mark V directly from there website since I have found out more about them, but the only size left available is a 53, no size 56. Did email Iro directly to find out if there will be any more size 56 available.

Thanks for any help.
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Old 03-11-12, 09:31 PM
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https://www.competitivecyclist.com/za...LCULATOR_INTRO.

Something tells me that a 56cm could be too big.

Also don't get your hopes up that IRO will email you back.
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Old 03-11-12, 09:45 PM
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Originally Posted by Dannihilator
https://www.competitivecyclist.com/za...LCULATOR_INTRO.

Something tells me that a 56cm could be too big.

Also don't get your hopes up that IRO will email you back.
Damn it, you beat me to it.
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Old 03-11-12, 09:57 PM
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I am 5ft 9 and I had the 53cm IRO it fit nicely. I guess I could have rode the 56 too. Depending on your body proportions 56 could fit. Go try it out before buying.
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Old 03-12-12, 10:23 AM
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It all depends on your body shape. I am 5ft10, but thats mostly leg. So i ride a 56. But some one with more average perportions or short legs it would not work out.
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Old 03-12-12, 09:11 PM
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Always guess small. It's much easier to make a small frame fit than a too big one. Also, I find the IRO's fit a teensy bit large. Go 53cm, even if you need a monsterous Stem.
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Old 03-12-12, 09:29 PM
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Originally Posted by David Broon
Always guess small. It's much easier to make a small frame fit than a too big one. Also, I find the IRO's fit a teensy bit large. Go 53cm, even if you need a monsterous Stem.
Both are a bit ridiculous. It's better to get fitted so you know what size fits you.
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Old 03-12-12, 10:09 PM
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Bike fit has very little to do with your height. It's more about your inseam. IF you know your inseam, great. Take that number in inches, multiply it by 2.54 to get your standover height in cm. Then subtract the bottom bracket height of the frame in question. that will be your ideal seat tube length. You have a few cm wiggle room but as someone above stated, round to the smaller frame size.

If you don't know your inseam:

1. get a yard stick/level/long, straigh something, stand in front of a wall, put in between your legs and pull it up into your gooch
2. make sure your stick is level and put the end of it on the wall and mark it on the wall.
3. measure from the floor to your mark.

This is your stand over height. Follow the instructions at the beginning of this post.

Example: (a common BB height on road bikes is 30cm)

if your measure your standover to be 32 inches:

35 x 2.54 = 88.9 (Stand over height)
88.9 - 30 = 58.9

So, you would need either a 58, 59 or 60cm seat tube. this would depend on the length of the top tube that best fit you.
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Old 03-12-12, 10:21 PM
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I just did that measurement with my numbers, and there is no way a 51cm seat tube would work for me on a road bike. Proper fit here for me is 54cm at the seatube.

There are a few schools of thought for bike fit. Dirt Jump mtb's go by the top tube.
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Old 03-12-12, 10:22 PM
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I got an IRO for my first fixed gear bike and I like it immensely. Decent components, decent frame at a reasonable price. Perfect for my recreational/commuting needs.

For sizing reference, I am 6'3, but mostly torso. The 59cm fits me fine.
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Old 03-12-12, 10:30 PM
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Yes, Dirt Jumpers and mountain bikes in general are generally measured differently. My method was for road bikes. Anything bike you jump will be measured by the top tube since the seat and seat tube will be as low as possible to avoid a saddle shaped suppository. To the best of my knowledge the seat tube on a regular mountain bike should be your road bike size - 4-6 cm, again, depending on the top tube.

I am 6'4 and ride a 58. I can ride a 59 or even a 60 comfortably but they are usually have too long a top tube.
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Old 03-12-12, 10:35 PM
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I would be more concerned with top tube length rather than stand over. Its not ONLY inseam but how long your arms your torso your legs
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Old 03-12-12, 10:45 PM
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Originally Posted by Mr. Mcshiny
Yes, Dirt Jumpers and mountain bikes in general are generally measured differently. My method was for road bikes. Anything bike you jump will be measured by the top tube since the seat and seat tube will be as low as possible to avoid a saddle shaped suppository. To the best of my knowledge the seat tube on a regular mountain bike should be your road bike size - 4-6 cm, again, depending on the top tube.

I am 6'4 and ride a 58. I can ride a 59 or even a 60 comfortably but they are usually have too long a top tube.
My range depending on make is 54-56 on the road.
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Old 03-12-12, 10:58 PM
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Originally Posted by Benson
Its not ONLY inseam but how long your arms your torso your legs
Very true, there is no one magical dimension of a bike frame that determines fit. It's the unique dimensions of your body as well as the bike's intended use.
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Old 03-12-12, 11:25 PM
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There was a fitment calculator on post #2.
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Old 03-12-12, 11:31 PM
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Originally Posted by Jaytron
There was a fitment calculator on post #2.
They must have missed it without a lemur and a multicolored background...
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Old 03-12-12, 11:33 PM
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Originally Posted by Nagrom_
They must have missed it without a lemur and a multicolored background...
FITMENT QUESTION?



>>>FITMENT CALCULATOR<<<
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Old 03-12-12, 11:47 PM
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Mission Complete.
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Old 03-13-12, 02:38 PM
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thanks for all the suggest guys, really appreciate it. will check out my lbs this week and see what kind of ssfg they have for sale at a reasonable price. If nothing appealing will probably go with the kilo tt as originally planned.
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Old 03-13-12, 03:10 PM
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Originally Posted by Nagrom_
Mission Complete.
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