[phutton]

The 1929 and 1930 catalogues both specify 26 x 3.25 tyres, equivalent to 3.25 x 19, for both front and rear wheels. For racing, a 27 x 2.75 front tyre is recommended, equivalent to 2.75 x 21.

The only Sunbeams up to 1935 that specified a 3.50 x 19 tyre were the 600cc Models 7A, 7B, 7C, 9A, 9B and 9C.

P.

[phutton]

What year is your M90?
p.

[Thomas]

Hi Alex,

according to my files 26 x 3.25 and 26 x 3.50 were installed by the works. I wonder though about the difference between 26 x 'XXX' and 'XXX' x 19.

Cheers, Thomas

[Alex]

Hello all,

one question regarding the rear tire. In the part list on the website I saw that the front and rear tire spec for the M90 was 3.25x19. However, most of the bikes I have seen on pricture nowerdays seem to have 3.50x19 rear tires fitted? What are your thoughts on that? On mine there was a 3.50x19 tire fitted, but if 3.25x19 was the original spec I would prefer to use the original spec but not sure what it is now???