Originally Posted By Rog
Originally Posted By Gambalunga
still thinking of changing tyres to 195/65 R15 instead of the standard 195/60 R15


Given the issues, 195/65 would be a good choice and they would fill the arches a little more. I wonder why the factory never used them or offered them as an option?

From a previous post:
Originally Posted By Gambalunga
For anyone interested I have used http://www.1010tires.com/tiresizecalculator.asp to create a chart of comparison between the standard tyre sizes quoted by Morgan in the user manual plus the 195/65 variation. You can look at it if you are interested. http://bradley.it/public_images/Tyre%20sizing.pdf

To sum it all up variations in axle centre height based on the tyres alone are: 4/4 12.69in or 322.32mm, Plus 4 12.10in or 307.34mm, Roadster 12.34in or 313.43mm, 195/65R15 12.49in or 317.24mm

In theory this means that the Plus 4 has the lowest ride height followed by the Roadster and that the 4/4 has about 15mm or more than half an inch more ground clearance than the Plus 4.


It should also be noted that the Roadster could be fitted with 205/65 R15 tyres which have a radius of 12.75 in or 323.75 mm, about 1mm more than the 4/4 tyres. Effectively this means an increase in ride height of 10mm and that a 4/4 wheel and tyre could be used as a "space saver" spare. Someone has done it but I can't remember who.

PS. Fitting a tyre that has a radius 10mm greater than the standard tyre would make it a fairly tight fit in the spare wheel opening. The opening for the spare is made to suit the tyres and wheels fitted and has only about 15 to 20mm of clearance on the existing tyre.

Last edited by Gambalunga; 04/06/14 06:07 PM. Reason: PS
Peter

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