building a 28" uni - tyre sizes ???

I got hold of 1x28" Bike Rim from an old Dutch Bike which came from Holland.

Whilst in Maastricht a little while ago I bought a 28"x1.5 Tyre, thinking
that this would adiquately fit on my rim. But no. It really doesn’t seem to
fit at all.

I am at a complete loss as to why not. The tyre also quotes 622x40 (the metric
equivalent of 28"x1.5 ?) - but I thought it would be a 700cx35/38/40 or
something similar. Can anyone expand …

Simon

----------------------------±--------------------------
|
Simon Greenway | I.O.U O
I.O.U@mindless.com | | Romsey, Hampshire, UK. | Idiots On Unicycles #/
| http://come.to/muni o
----------------------------±-------------------------- we’re no good,we don’t
aim to be,'cause we never will be
----------------------------±--------------------------

Re: building a 28" uni - tyre sizes ???

Simon wrote:

> I got hold of 1x28" Bike Rim from an old Dutch Bike which came from Holland.
>
> Whilst in Maastricht a little while ago I bought a 28"x1.5 Tyre, thinking
> that this would adiquately fit on my rim. But no. It really doesn’t seem to
> fit at all.
>
> I am at a complete loss as to why not. The tyre also quotes 622x40 (the metric
> equivalent of 28"x1.5 ?) - but I thought it would be a 700cx35/38/40 or
> something similar. Can anyone expand …

As far as understand it there are 2 measurements for tyres, the old way was to
measure the rim, the new way is to measure the outside of the tyre of a datum
tyre and then give enlargements on the diameter by the extra letters… or
something like that. Pashley sell the large, old style 28" for their unicycles.

Roger