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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)

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Old 01-23-05, 09:55 PM   #1
moxfyre
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IRO Hub dimensions?

I'm trying to buy spokes to use with my new IRO flip flop hub (36 hole, 126 mm version). Does anyone know the dimensions for this hub (Sheldon Brown diagram).

Thanks!
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Old 01-23-05, 11:25 PM   #2
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Invest in some basic calipers, one of the best things you will ever buy. I think I use mine the most out of any tool I have, besides maybe an adjustable wrench. Regardless, I KNOW you own a ruler with millimeters on it.
I believe that for most high-flange track hubs measurement d will be 62.5mm or 67mm, and w for both sides (assuming flip-flop) is often about 30mm give or take about 2mm for some hubs, down to 27 for the Suzue.
Sorry I don't know the specific answer, I'm just referencing a spreadsheet for most of this.
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Old 01-23-05, 11:35 PM   #3
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Check IRO's website under Specifications.
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Old 01-23-05, 11:35 PM   #4
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Quote:
Originally Posted by ryan_c
Invest in some basic calipers, one of the best things you will ever buy. I think I use mine the most out of any tool I have, besides maybe an adjustable wrench. Regardless, I KNOW you own a ruler with millimeters on it.
I believe that for most high-flange track hubs measurement d will be 62.5mm or 67mm, and w for both sides (assuming flip-flop) is often about 30mm give or take about 2mm for some hubs, down to 27 for the Suzue.
Sorry I don't know the specific answer, I'm just referencing a spreadsheet for most of this.
Thanks for the tip on calipers. I'm actually not lazy so much as just ridiculously impatient (or so I like to think).

As it happens, an IRO employee is working late and responded to my email with the specs: d = 62.0 mm (flange diameter), WL = WR = 31.0 mm (width from center to flange).
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Old 01-24-05, 12:54 PM   #5
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IRO employee hahahaha, you mean tony?
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Old 01-24-05, 01:26 PM   #6
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IRO employee hahahaha, you mean tony?
Uh... yeah! Is it a one man operation or something? He's very helpful, in any case.
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Old 01-24-05, 02:44 PM   #7
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IRO's more or less a one man operation though I get the impression that Tony has some folks who work part time for him. But he's the dude with the email. It pays to be the boss, or something.

Also, if you're going to get hub dimensions, you don't need real calipers. Getting the width is easy enough (just lay the ruler flat across the hub flanges and measure away). You can probably pretty easily eyeball the flange diameter (spoke to spoke), but if that's not good enough for you, and it shouldn't be, you can take an old spoke, bend it until it exactly spans from one spoke hole to the hole across without any additional tension necessary on your part. Now measure the separation with your ruler. That's gonna be as accurate as your caliper measurement.

-Trevor, who just ordered an IRO track hub and will be using this same procedure to get dimensions off it.
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Old 01-24-05, 03:40 PM   #8
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-Trevor, who just ordered an IRO track hub and will be using this same procedure to get dimensions off it.
Well, you shouldn't need to measure the dimensions because I got them from Tony himself, and I assume he knows what he's doing. They're in my above post: 62.0 mm flange diameter and 62.0 mm distance between flanges (31.0 mm center-to-flange for both flanges, since it's a flip flop).
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Old 01-24-05, 03:49 PM   #9
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Yours is a 126mm hub, mine is the track spacing, 120mm.

Maybe the the only difference will be 6 mm subtracted from the flange-to-flange span. Or maybe not.
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Old 01-24-05, 03:58 PM   #10
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Gotcha. In any case, I'm going to send the dimensions to the Spocalc database soon as I can verify them!
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Old 01-25-05, 08:41 AM   #11
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Quote:
Originally Posted by bostontrevor
Yours is a 126mm hub, mine is the track spacing, 120mm.

Maybe the the only difference will be 6 mm subtracted from the flange-to-flange span. Or maybe not.
Not.

The hub body is the same size. Spacing is achieved with, wait for it.......spacers.
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Old 01-25-05, 09:52 AM   #12
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Hah. Love it.

Anyhow, mines's gonna show up sometime today, I'll measure because I'm pedantic like that. Also, it looks like Herr Tony has put up a new page. Good on him: http://www.irocycle.com/fixedgearand...inc/id119.html
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