Hi all, Not wishing to extend this topic about my tyres but I thought I should (humbly
) come on again to admit, after doing some extensive research today, that I now think Mr Dunlop was, in fact, playing it safe in his email to me (as some of you rightly suggested), and perhaps I shouldn't be setting my pressures to the 1960s BSA instruction book specification.
Trying to find out exactly what I should be setting them to wasn't easy as there are so many confilcting opinions on lots of other biking forums about K70s (mainly for Triumphs & Nortons).
I did find a tyre fitting chart on the Dunlop site but BSA isn't listed but Royal Enfields are and the 500cc bullet takes K70s with 3.25 x 19 front and 3.50 x 19 rear and the max load pressures are given as 32 psi for both front and rear. That ties up pretty well with the 33 psi that's on my Gold Seal K70s,
On the Dunlop chart the recommended pressures for the 500cc Royal Enfield Bullet is 24 psi for front and 32 psi for rear. So I think I'll be safe to settled for that as a starting point. After a ride I'll measure them again to see if the pressures are about 2 psi higher when warm, as I think that should be a reasonable indicator that those pressures are ok.