Unicyclist Community 32" rim on 90mm hub for road?
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 2016-01-28, 07:56 PM #1 Alice Arctan rhymes with dark tan     Join Date: Feb 2013 Location: anglophone North America Posts: 271 32" rim on 90mm hub for road? Bad idea?
 2016-01-28, 09:25 PM #2 juggleaddict late-night rider     Join Date: Aug 2009 Location: Grand Rapids, MI Age: 30 Posts: 1,281 Quick math here, 762.5mm ERD for a 36er ~660mm (-4in) for a 32...er? hub flange width for a 100mm is 68mm hub flange width for a 90mm is 58? assuming here. tan^-1(68/762.5) = 5.0962 tan^-1(58/660) = 5.02218 I would say you're OK. The higher the number here, the stronger the wheel will be. It's fuzzy math, but at first glance I'd say it will be fine. It will be a similar stiffness as a KH 36er. I would check the ERD of the actual rim to make sure it's close to 660mm. Keep in mind that current 32mm rims are single walled, and not nearly as strong or stiff as a Stealth 2 36er rim, so that "similar stiffness" statement above was a lie. It will only be a similar (not exactly the same) stiffness if everything were equal. and stiffness is relative to the wheel size too I believe. In short, I'm not a wheel builder, so don't trust what I have to say. __________________ Steel is real! => I ride a Nimbus!
 2016-01-28, 09:54 PM #3 LanceB This space available     Join Date: Oct 2012 Location: Northridge, CA Age: 67 Posts: 1,701 I think it would be fine. I have the 32" Kent wheel, and it's pretty stiff. I ride it with a Schlumpf hub, so the geometry is different, but I think the setup you suggest would be good. Just my opinion. __________________ "I'm a unicyclist. I make my own reality."
 2016-01-28, 10:17 PM #4 saskatchewanian ERIC P     Join Date: Jan 2007 Location: La Ronge, Saskatchewan, Canada Age: 34 Posts: 6,472 First I am going to say: From a strength perspective you should be fine with a 32" wheel built on a 90mm hub. In fact it should be about equivalent to using a 125mm disk hub for lateral stability. Now that that is out of the way I am curious why you would want to? I like slightly off-colour projects but staying within established standards make things easier and cheaper. __________________ My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton
2016-01-28, 11:33 PM   #5
Alice Arctan
rhymes with dark tan

Join Date: Feb 2013
Location: anglophone North America
Posts: 271
Quote:
 Originally Posted by saskatchewanian Now that that is out of the way I am curious why you would want to?
I've discovered I like narrowness for road.

 2016-01-30, 09:09 PM #6 Alice Arctan rhymes with dark tan     Join Date: Feb 2013 Location: anglophone North America Posts: 271 Thanks to all for the answers.
 2016-01-30, 10:28 PM #7 GizmoDuck Adventure Unicyclist     Join Date: Apr 2002 Location: Wellington, NZ Age: 41 Posts: 3,680 I use the Nimbus Eclipse (92mm) hub laced to a 700c Mavic Open Pro rim, which I find excellent. It's lighter than the 100mm Nimbus Equinox hub, and still fits in a 100mm frame if there is a bit of flex (I can get it in my 29" Triton). It's such a great set up I'm building another one with a slighter wider road rim. This is the 92mm hub in a custom frame: Attached Images   Last edited by GizmoDuck; 2016-01-30 at 10:33 PM.

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