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PostPosted: Tue May 13, 2014 11:44 am 
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Joined: Sun Aug 07, 2011 4:00 pm
Posts: 14
Hi,
I decided to order a pair of 38mm tubular wheelset from farsport and I must choose rim width between 20.5 mm and 23mm. The weight and price is the same. I'm going to use Veloflex Carbon 23c tubular tires on it.
I don't know which one should I choose.
Theoretically wider rim may be more stiff and also more aero due to equal width of tire, but I think there may be only myths.
Morover, I'm not 100% sure that info from farsport about the same weight of both widths is true, bacause the logic says wider rims=heavier rims.
Is there any sense in choosing 23mm wide rim?

I will be grateful for any help.


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PostPosted: Tue May 13, 2014 1:18 pm 
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Joined: Sat May 12, 2012 8:32 am
Posts: 394
Location: Adelaide, Australia
Hi,

I believe you want 20.5mm wide rims, I think the 23mm rims are for cross use. Not a tubbie expert, but I think the edge of the 23mm rim may strke the ground on hard cornering - don't quote me on that though. That said, Zipp firecrest tubbies are much wider than 23mm, for aero effect.

For Tubbies wide = more aero

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Posted: Tue May 13, 2014 1:18 pm 


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PostPosted: Tue May 13, 2014 4:50 pm 
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Joined: Sun Aug 07, 2011 4:00 pm
Posts: 14
Strking the ground on hard cornering isn't any argument, because if it was possible then the leading manufacturers like zipp, hed, vision, bontrager or reynolds would never introduce their newest models of wheels with rim width 25-27 mm. What's more they wouldn't mount narrower 23-25 mm tubbies on that rims.


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PostPosted: Tue May 13, 2014 5:12 pm 
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Joined: Tue May 03, 2005 2:20 am
Posts: 5793
Location: Belgium
Hi,

Define rim width.

Technically it is the outer width of the rim measured across the rim bed. That is what defines the minimum tyre width you can mount on the rim and that should at least be equal to this width.

Ciao, ;)

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PostPosted: Tue May 13, 2014 5:20 pm 
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Posts: 1244
Location: McCall, ID
I've found for tubulars rim width isn't nearly as important as for clinchers. I don't think you'll see any real world difference between the two. It's all about the tires!

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PostPosted: Tue May 13, 2014 9:03 pm 
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Joined: Sun Aug 07, 2011 4:00 pm
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By rim width I mean the outer width of the rim measured between two sides of breaking surface. That isn't what defines the minimum tyre width you can mount on the rim, because it depends on inner rim width and in this case its around 15mm. It's obvious that I can't mount 14mm tyre, but e.g. 19mm tyre is ok. I saw 22mm tubbies on the 27mm wide bontrager aeolus.

My question was more about yours experiences/observations, bacause I already know that 23mm Veloflex Carbon easy fits to both type of rims. (20.5mm and 23mm).


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Posted: Tue May 13, 2014 9:03 pm 


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PostPosted: Wed May 14, 2014 7:00 am 
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Joined: Wed Jun 01, 2011 7:53 am
Posts: 303
Yes many do ride 22 and 23mm tires on wide firecrest rims. That is also what Zipp recommends for firecrest rims. Personally i like 25mm veloflex or fmb tires on mine.

To answer the OP, go with the 23mm wide rims if you can, it's a more modern design, better aero, feel and works better with even wider tires like 25mm.


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