I know it seems odd, but the spit wheels are definitely 1'' wider. I will need to wait until I get the tyres off to measure it properly but they have old 155 x 13 tires on at the moment as opposed to 155 80 x 13 on my Vitesse.
I previously had a Herald and by sight the wheels look the same, maybe the originals got swapped with Herald wheels for some reason, I can't think of any other explanation.
I think I will go for 155 80 on the new wheels , the one wheel I have with 170 70 has so much rubber on the ground I suspect it may make the steering rather heavy.
I had thought about splitting the difference, but I can't find a 165 that is anywhere near the correct circumference.
Thanks,
Bob