Re: Wheel Sizes

[Naqerj]

David Martin wrote:

> The thing to look for is the ETRO number.

I think there should be another letter in there... ETRTO?

ISO size is the same thing.

> This is the bead seat
> diameter, ie the size of the rim the tyre fits on and the width of the
> tyre, and looks like 622-25 (622mm diameter rim and 25mm cross section
> tyre, broadly equivalent to the 27 x1" but not quite the same.) Here is
> an abbreviated list of sizes
>
> ETRO traditional description
> 635 28" Policemans bike
> 630 old 27" road
Well, not *that* old... it's post-WW2 (there was a pre-war 27 x 1-1/4;
that's ETRTO 622!)

> 622 700c (also known as 29" for off road)
> 597 Another 26"
That's 26 x 1-1/4

> 590 Old 26" roadster
26 x 1-3/8 or 650A

> 584 650B
26 x 1-1/2 in UK

> 571 650c
26 x 1-3/4 (ie: trade bike size)

> 559 26" mountain bike

and it's round about here that my memory fails
> 547 24"
> 541 600A
> 540 24"
> 520 24"
> 507 24"
> 501 22"
> 490 550A
> 451 many 20" folding bikes
> 440 500A
> 438 Dutch 20"
> 406 20" BMX
> 400 18"
> 390 450A
> 387 Dutch 18"
> 369 17" Moulton
> 355 Another 18" size
> 349 16"
> 340 400A
> 305 16"
> 298 14"
> 254 14"
> 222 11"
> 203 12 1/2"
>
--
Andrew

 

[m-gineering]

Naqerj wrote:
>
> David Martin wrote:
>
> > The thing to look for is the ETRO number.
>
> I think there should be another letter in there... ETRTO?
>

European Tyre and Rim Technical Organisation

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl