Technically the optimum size is based on the rim width, therefore the
tyre section size dimension is the selection criteria. You may have a
choice of aspect ratio depending on the tyre market and supplier
arrangement in your area.
I am pleased to see Michael is 'back' and agree that 175mm width was my
choice.
From the introduction or radial carcas construction versus the Healey
design period cross-ply generally the go was lower profile ( aspect
ratio ) therefore a corressponding smaller rolling radius and overall
diameter.
Handling and tyre tread stability depends on the tyre fit to the rim width.
I do also recognise the one should not stuff-up the look of a Healey
Joe
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