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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Oct 2016
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Talk Morgan Regular
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Just reading a couple of threads here that had a discussion on wheel sizes and the tyres on the Supersport... I wonder if I have the wrong wheels on my 2012 built plus 4 sport. It was an ex demo. And is running 205/65 15 tyres. So is it safe to assume they are 6.5 inch rims?
I have to say after a session at Snetterton I think it over tyred.... I could get no drift at all... loads of grip then nothing. But of course that could have been down to driver inexperience.
Nick
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Joined: Feb 2011
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Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Oct 2016
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Joined: Feb 2011
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Member of the Inner Circle
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Sounds like you have the wider “Sport” wires fitted. Most Plus4s have the standard 6” wide wires with 195 tyres. There’s no reason why you shouldn’t fit that size tyre to your existing rims.
When I replaced my standard alloys with Minilites on my Roadster, I dropped a size to 195/65/15 and it certainly improved the feel of the car. Morgans really don’t suit wide tyres unless they are Aeros.
Jays
Former Morgan owner. Gone but hopefully not forgotten!
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Joined: Feb 2016
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Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
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Useful rolling radius v tyre size calculator here. Helpful in determining gearing effects (and speedo accuracy) when swapping sizes.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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