classic tyres

[sparky]

Hi all, Im wanting to change a set of tyres on my Triumph 500 and want a more up to date set on better rubber componds away from the old speedmasters.
I know tyres are a personal choice but what are my options with out putting  the same tyre on back & front, I thought michelin M45rear  but cannot find a front to go with it, also whats the new tyres sizes for 325x18 and 350x18 as its a mine field to me. thanks for any help.

[twolitre]

I have just fitted a set of Dunlop K82s to my 1959 Triumph 5TA Speed Twin, of the sizes you mention. They have lots of tread and look the part. They seem to be one of the very few choices of matching tyres in those sizes.
Within the speed capabilities of my twin, the handling and grip seem fine. Can't tell you about service life, mine have only done about 1000 miles.
The diameter of newer tyres will still be 18", but with car radial tyres the 3.25" and 3.5" would be expressed in millimetres. I am unsure whether metric units are used on any motorbike tyres because I've never looked! I'm sure someone will tell you.

[sparky]

cheers for the info, seems your about right as there aint many to choose from thanks again Dave..