'If it isn't broken, why fix it?'

There's a lot to be said for sticking with what's tried and tested Heinz thumbs

I also suspect the 165 section T-Trac gives excellent steering feel and the 80 profile will deliver superior ride quality too. Actually I looked at fitting the The Vredestein 165/80 T-Tracs to Monty as I'm a big fan of skinny tyres, especially on a small light car with unassisted steering like a Trad Morgan.

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But had to look elsewhere as 185 was the smallest section tyre suitable for Monty's 6" rims as shown above.

I've been extremely happy with my Continental EcoContact 6 in 185/65, these replaced the original and 11 year old Yokohama C-Drive 2s in 195/60 that Monty came with that understandably had gone hard as wood. I went down in section from 195 to 185 but up in profile from 60 to 65, as this is an aspect ratio the change in the true rolling radius was tiny.

The original Yokos being 615mm with the Contis coming in at 621.5mm, a difference of just 6.5mm which ensured my speedo remained accurate.

The Vredestein T-Trac 2 has a modern tread pattern, so I'd put money on it shedding water better than any of the 'Classic' tyres that it also has to be said are extremely expensive to buy! Why pay more for a tyre that's potentially less safe in the wet, and when you have the option of the more modern tread pattern Vredestein T-Trac 2 in a Morgan ride quality friendly 80 profile that will also fill the arches nicely for period correct aesthetics?

I believe the Sigma engine 4/4 runs rims that are 5" or possibly 5.5” at the most, this means you probably shouldn't be fitting a 185 tyre anyway. A 165 section tyre is surely safer on your narrow rims so to my mind the Vredestein 165/80 T-Trac is the perfect tyre for your lovely narrow body Morgan Heinz, stick with what you know and what you know works thumbs