the first thing to say is that your speedo readings wont be accurate.
If you want to keep as much as accuracy as possible you should go with something that has a similar perimeter. I havnt fitted my other wheel/tyres yet, but i have a quite stiff front end (1303) and stock 165/80r15 tyres and the car is really bouncy over speed bumps though and feels like hell is approaching when tried to pushed to the limit.
I believe that going with the 45s will give you better handling but they will be much more unforgiving compared to the stock tyres. meaning that the car might understeer in slippery conditions easier due to stiffer suspension and less (stock,anything you have in the boot but not added) weight to make it work...
Hope this isnt to frustrating
Chris
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Aircooled 4ever
1973 1303 going towards GL
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