20mm vs 23mm tyres

About a month ago I put some new 23mm tyres on my roadbiketo replace the
old 20mm tyres. Having just got a new pump from Santa that has a
pressure gauge I went for a ride this mornign with the correct pressure
for the first time. What I found is that the extra "height" of the tyre
means the rear tyre now rubs against the frame at its point closest to
the centre of the bike.. So does that mean I need to go back to 20mm on
the rear? And is there any reason why I shouldn't get my money's worth
out of the new 23mm tyres and use them on the front (it doesn't rub at all)?

And while I'm lookign throught the online sites, can someone explain the
difference between tubular and clincher tyres (or is that just Conti
terminology)?

Sounds like you have a Giant. On some of their models, some brands of 23mm
tyre will rub as you indicate. Other brands are ok.

Nick

"Dave" wrote in message
...
About a month ago I put some new 23mm tyres on my roadbiketo replace the
old 20mm tyres. Having just got a new pump from Santa that has a
pressure gauge I went for a ride this mornign with the correct pressure
for the first time. What I found is that the extra "height" of the tyre
means the rear tyre now rubs against the frame at its point closest to
the centre of the bike.. So does that mean I need to go back to 20mm on
the rear? And is there any reason why I shouldn't get my money's worth
out of the new 23mm tyres and use them on the front (it doesn't rub at
all)?

Actually it's an Apollo aluminium frame. Sounds like a costly exercise
to work out which 23mm brands will fit and which ones won't.

Nick Payne wrote:
Sounds like you have a Giant. On some of their models, some brands of 23mm
tyre will rub as you indicate. Other brands are ok.

Nick

"Dave" wrote in message
...

About a month ago I put some new 23mm tyres on my roadbiketo replace the
old 20mm tyres. Having just got a new pump from Santa that has a
pressure gauge I went for a ride this mornign with the correct pressure
for the first time. What I found is that the extra "height" of the tyre
means the rear tyre now rubs against the frame at its point closest to
the centre of the bike.. So does that mean I need to go back to 20mm on
the rear? And is there any reason why I shouldn't get my money's worth
out of the new 23mm tyres and use them on the front (it doesn't rub at

all)?

And while I'm lookign throught the online sites, can someone explain the
difference between tubular and clincher tyres (or is that just Conti
terminology)?

I could explain
but Sheldon does it so much better
http://www.sheldonbrown.com/gloss_ca-m.html#clincher

http://www.sheldonbrown.com/gloss_tp-z.html#tubular

Dave wrote:

the rear? And is there any reason why I shouldn't get my money's worth
out of the new 23mm tyres and use them on the front (it doesn't rub at
all)?

Theres no problem with different tyre sizes front & rear, if thats what
you mean. It can be a good idea. See Sheldon Brown's site.