[trener1]

I was going to order the Vittoria Corsa Evo CX, but it seems that it only comes in a 21, is that really case? and is that too narrow for a all around tire?.

 

[PinarelloFan]

where have you seen a 21 mm ?? They come 20 or 23 ....

Are u talking tubular ?? If so then isn't that kinda standard ??

more info please

 

[trener1]

Here
http://schwabcycles.com/itemdetails.cfm?id=993

And my LBS told me the same thing.

 

[PinarelloFan]

So you are riding tubular ??

 

[trener1]

Yes Tubuler.
I don't know what standard is that why I am asking.

 

[btrutta]

They make 20's, 21's and 23's, hard to find the 23's though.

 

[trener1]

I guess my question is...
In clinchers for the most part, people ride 23.
Is the standard in tubies 21? or is this something just in Vittoria?.

 

[JaeP]

I guess my question is...
In clinchers for the most part, people ride 23.
Is the standard in tubies 21? or is this something just in Vittoria?.

There is really not a tubular "standard". You can get tubulars in various sizes as well. I have a set of those Vittoria tubulars on my my track bike (220psi, baby!). There is a compromise between comfort and performance. In a nut shell:

Larger tires = more comfortable ride (lower psi)
Smaller tires=more performance (higher psi)

 

[Kerry Irons]

Not really

In a nut shell:

Larger tires = more comfortable ride (lower psi)
Smaller tires=more performance (higher psi)

Well, this is just plain wrong, or at least not right. Smaller tires means higher pressure (to prevent pinch flats) and so poorer traction, lower comfort, quite possibly more rolling resistance (due to higher pressure tires "bouncing" off road surface imperfections), and faster wear. Smaller tires do weigh slightly less, and on the front wheel can give a slight aero advantage.

The real "nut shell" is more like: ride at 90-100 psi, and if you get pinch flats, go to a larger size tire.