I have not yet fitted them but I recall that a Swiss owner has and a couple of other people. It will make a small difference in the ratio and I may have to adjust the speedo. The Plus 4 has no problem pulling 5th gear and a slightly higher ratio for touring would be fine. Also I intend to fit a throttle body kit that will lift the output to about 180hp so that should cover it. The link to the tyre size calculator will give the table that I have in the file, it was the source of my figures, but will also give the change in speedo reading as a percentage.

I too have only just enough to clear the ramp to my garage and if the tyres are down a bit I do touch despite the fact that the rear springs were changed to 5 leaf springs under warranty just for this problem. I will eventually change the rear springs to the Suplex kit that is under development and I will probably change the tyres at that point.

Peter

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