Horse_Apple said:

Higher speed and load ratings without going wider on tyres. Plus the reduction in flex.

With big HP on these cars you don't need any more rubber than 225 as they grip well enough. Plus, you want excess torque to be released by spinning a wheel rather than sheering the half shafts or more expensive damage in the drivetrain.

So to get a nice selection of modern road tyres you need to step away from the traditional 16" tyres and use more modern 17/18" ones where there is a good supply of on-road options with suitable tread, load and speed ratings. Ie T or H and 106 or greater.

Then there is the obvious issue of needing a larger diameter to create room for the required larger brakes.

Plenty of modern alloy wheel options but these look very wrong on a Classic, especially a Suffix A.

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goonarmy said:

How many horses you running? I don't think I was that far off the factory 190 but never got anywhere near shredding tires. The MTs I had were Q rated so 99mph. Think I might have got close (or even over) to that but as I remember the motor shifted well up to about 75-80 then you could literally feel the air piling up on the front giving resistance. It would press on past that but it took forever. The tires never felt to be a weak point. Although it is an old car with old tire designs I suppose.

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tarphenry said:

Hi looking at R/R rostyle rims, any machine shop would be able to machine the wels off and remove the centre. then get them to remove the centre from the 17 or 18 s then you can have a band made to increase the diameter of the rostyle to fit the other rim .Just look for a general engineering company, there are plenty of comanies that could do this work for you. any small engineers would probably be glad of the work

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Horse_Apple said:

After running the 5.7 Overfinch, this build will have a little more power.

The install is an M113 AMG. They are the same size as the RV8 and being that much younger, a better unit. Without the breathing restrictions and Eco settings when in an E55 we usually see about 400bhp by 400 lbs.

More than enough to start breaking even Ashcroft's updated internals.

The first installation will just be a 5.0 M113 to get it all bedded down and running prior to swapping it out for the 5.5

This is why, like with the Overfinch I need to pay very close attention to the tyres. I ran 255 Avon Turbospeeds on that but they were unecassarily wide and far too expensive. 225/235s are more than sufficient and will put less accidental strain on the drive line. The 255s also impacted on the turning circle which is also a waste.

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West Slope Rover said:

I'll shut up. This time.

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