600 x 45 is not an ISO designation. It is actually the same size as 24in MTB tyres with ISO designation 45-507 and normally called 24 x 1.75in according to Sutherlands which is normally reliable on tyre sizing. So tyres will be easy to get. Hilary Stone
Glenn Jordan wrote:
> Friend in Chapel Hill has asked me to help him get a "Surrey" side-by-side
> trike back into running condition for him. It has a crankset for each rider
> connected to drum brake rear wheels with Bayless-Wiley freewheels and a
> fringe on top.
>
> The rear wheels are an ODD size. They have Italian tires that claim to be
> 24x1 3/4", and the ISO designation 600x45 ! This is the first time I've seen
> an ISO number that doesn't match anything on Sheldon's Tire Size chart:
>
> http://www.sheldonbrown.com/
>
> so, I am clueless - maybe these are sized for Schwinn S-2 rims ? The rims
> are stainless, and are shaped like the old rod-brake style rims on the Rudge
> 4-speed, except that they are a lot smaller.