Re: [CR]New member, Scotland.

(Example: Framebuilders:Dario Pegoretti)

Date: Tue, 06 Mar 2001 09:45:48 -0500
From: Jerry Moos <moos@penn.com>
To: gbsw10644@cableinet.co.uk, Classic Rendezvous <Classicrendezvous@bikelist.org>
Subject: Re: [CR]New member, Scotland.
References: <3AA4CBFE.FDE07302@cableinet.co.uk> <3AA4F628.72C26BAE@penn.com>


Looks like the link may not have come through properly, it's:

http://www.sheldonbrown.com/tire_sizing.html

Regards,

Jerry Moos

Jerry Moos wrote:
> Welcome, Gerry. For a good discussion of wheel and tire sizes see Sheldon's
> page:
>
> Tire Sizing
>
> To give the brief overview, 700C tires are now known as xx-622, xx being the
> width in mm. 27" are xx-630. Thus a 700C clincher rim will be
> approximately 622mm in diameter measured to the bead seats. Full size
> tubular (sprint) rims should have a similar diameter, though it could be a
> few mm off, as they have no bead seat as such. 700C, at least according to
> popular myth, were developed in the 70's to have a diameter measured at the
> braking surfaces which was the same as a tubular rim, thus allowing one to
> switch between clinchers and tubulars without moving the brake pads. If you
> have clincher tires, the size is almost always marked on them, either in the
> old 700C x yy or 27 x 1 x/y format or in the new xx-622 or xx-630 format.
> Tubulars often lack size markings, but so called "27" and so called "700C"
> tubulars are the same, just two different ways of referring to the same
> thing. Any modern tubular other than these will be a distinctly smaller
> size with a rim diameter significantly less than 622mm. Again, as with most
> subjects, Sheldon's site gives a much more thorough explanation than I can.
>
> Regards,
>
> Jerry Moos
>
> Gerry and Caroline wrote:
>
> > Hi there folks, I've just joined the list properly after having submited
> > an unauthorised posting when I linked in from the home page. From that
> > contact I've allready been in touch with Clive in Sydney and Nelson in
> > Seattle, so hi again guys and thanks for your thoughts.
> > I'm totally new to this scene, having recently been given a mid/late
> > '70's Holdsworth, and wanting to find out some stuff about it. It seems
> > to have some ok parts on it;Zeus cranks,bb and read mech, and Lambert
> > hubs(are they American). It is a sort of purple colour with cream panels
> > and is built from reynolds 531. can anyone give me some help on
> > age,model and what parts it should actually have. I've not ridden it yet
> > as it's got a punctured tub that I have no idea how to fix, I also am
> > confused as to how to figure out it's wheel size (27", 700c or even
> > 650c), do I measure across the diameter.
> > I've been watching how the list works and what you all talk about and it
> > seems that it takes a lot of knowledge of classic bikes to know what is
> > going on, but obsession is obsession so I'm sure I'll soon pick it up.
> > Any tips on good sites to visit or books to get hold of to learn more.
> > Hope to hear from some of you soon , bye for now.
> > Gerry " yet to find himself a quirky mid-name catchphrase" Burke.
> > Cumbernauld, Scotland.