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what advantages of 20mm tires over 23?(11 posts)

what advantages of 20mm tires over 23?bikechick
May 2, 2003 3:57 AM
I've only ridden 23's. Currently vittoria open corsca which I've been happy with.

Thanks
Less contact with road surface; lighter.c722061
May 2, 2003 5:02 AM
Not always.Rusty Coggs
May 2, 2003 5:34 AM
Everything else being equal, and given equal loaded weight,and inflation pressure the contact patch covers the same area.
that parts' obvious but how does the ride compare? thx (nm)wolfereeno
May 2, 2003 6:37 AM
allows you to get more practice fixing flats on road nmFez
May 2, 2003 6:36 AM
LOL, That's my experience.......... nmDave Hickey
May 2, 2003 11:37 AM
re: what advantages of 20mm tires over 23?Fez
May 2, 2003 6:37 AM
if you've been happy with the 23s, don't change what makes you happy.
NoneRJF
May 2, 2003 7:07 AM
I rode 20's for years and just recently switched to 23's. I really can't tell the difference. I've read on this board that the 23's actually have a smaller contact patch because their increased size causes them to be more rounded, whereas the 20s are squarer because they are stretched across the rim. Either way, they feel the same to me.
Contact patch insightKerry
May 3, 2003 5:36 PM
The SIZE of the contact patch is determined by bike/rider weight divided by tire pressure. Example, 200 lb bike/rider and 100 psi in tires = 2 square inches of contact patch, regardless of tire width. The SHAPE of the contact patch is more dependent on tire size (narrower tire = more elongated elipse shape).
more or less none outside of TTsweiwentg
May 3, 2003 8:16 AM
the ride was much rougher for me.
might be a slight advantage if you're light.jw25
May 5, 2003 11:56 AM
Like around 100 lbs. 20mm tires are lighter than their 23mm counterparts, and for a light rider, rolling resistance differences should be minimized.
Other than that, TT's are about the only place they really make sense, as aerodynamics are more important there, and a 20mm tire is much closer to the rim width, so the airflow can be smoother over the wheel as a whole. In a TT, you tend not to corner as much, so pumping the tire to it's max pressure isn't as big a drawback, and can offset the rolling resistance disadvantage.
If you're happy with the Open Corsas (which are big for a 23, in my experience), even going to another brand of tire in a 23mm size may bea drawback. I've ridden Open Corsas, and gave them up after too many slices - the roads are ugly around here. I mounted a set of Conti GP3000's, and what a difference it made. I didn't flat on them, but the ride was nowhere near as nice. The Conti's are slightly taller and skinnier than the Corsa's, and the casing's less lively. But that's another story.