Dave the standard tyre size unless they have change it is 195/60HR15. The thing is that Morgan adjusts the width of the mudguards depending on what tyre width is ordered. The 195 is 10mm wider than the 185 fitted to the 4/4 2 Litre so will probably stick out a fraction, perhaps only a few mm, and be more likely to throw road grime, mud etc. outside the guards.
If you are worried about ground clearance you need to be careful too. A good site that allows you to do tyre comparisons is
http://www.1010tires.com/Tools/Tire-Size-Calculatorbut they no longer list the 185/70HR15. Attached is a pdf file of some information I obtained regarding changing my tyres to 195/65HR15.
Hi Peter, I only noticed this thread now and am very interested in your attached PDF file.
My car (+4, 2010) came from the factory with 195/60HR15 Yokohama tyres and I got to say I find them to be great, both in dry and in wet conditions. No complaints, I even did my first few hillclimbs with them and they did the job as needed.
(now I swap tyres when racing, never looked back after the first time I mounted 4 TOYO Tyres that totally transform the car. These are very low 195-50-15 tyres, but mindblowingly grippy)
With the Yokohamas, as I said, no complaints, except ... ground clearance. Even with all the care in the world, getting the car safely in and out of steeped ramps into/from underground parkings is very tricky.
I noticed you fitted tyres with the same width and slightly higher sides (65 instead of 60). From the PDF table you attached that ups ground clearance about one cm. Does it make a "real" difference? And doesn't fifth gear get too long, therefore hardly usable?
Thanks in advance, soon I'll need to buy new road tyres and will have to decide if I keep the current specs or go for something different.
