Rubbing me up the wrong way.....

[iaint]

Originally posted by J4P RX
Why would they be "proper" sizes.  You can run anything that fits on the rim safely surely.

They just might be the sizes that keep it closest to toe original rolling radious if thats what worries you?

Just Ive run all sorts of stuff, the rolling radious thing doesnt bother me in the slightest.

You\'ve hit the nail on the head Lee - if the radius causes the speedo to overread no worries but if it\'s under-reading (apart from being illegal) you could quite quickly wave goodbye to your licence.

[EVO666]

There\'s a conversion program on the web that shows the difference in speeds between a cars standard wheel and tyre size and whatever the larger wheel and tyre size is...... The difference between a 16" and an 18 or 19" rim is only a few mph......  hardly licence loosing stuff......  unless your speedo is reading 98mph and really you\'re doing 101mph.....but surely that\'s splitting hairs ??

[J4P RX]

Yeah thats exactly the way I look at it.

The differences are so small percentage wise.  And how accurate is the speedo anyway, and how accurate has your mph conversion been carried out on top of that.  So many variables already imho.

As for the problem, let us know what its like with the spacer off.

[EVO666]

Couldn\'t agree more.

I\'ll let everyone know Monday, will be taking them apart on Sunday.....

[Fish]

Originally posted by J4P RX
Why would they be "proper" sizes.  You can run anything that fits on the rim safely surely.

Lee, they are the proper sizes, as this is what MAZDA fitted on the later model cars. Oh sorry Mazda must have got it wrong.

Evo, sorry about that, not what you need on this thread.

Fish

[J4P RX]

Originally posted by Fish
Lee, they are the proper sizes, as this is what MAZDA fitted on the later model cars. Oh sorry Mazda must have got it wrong.

Now that is a much better answer, and one I find acceptable rather than the rolling radious stuff.

Still doesnt stop people changing loads of other Mazda bits though eh :p  

[iaint]

Originally posted by EVO666
There\'s a conversion program on the web that shows the difference in speeds between a cars standard wheel and tyre size and whatever the larger wheel and tyre size is...... The difference between a 16" and an 18 or 19" rim is only a few mph......  hardly licence loosing stuff......  unless your speedo is reading 98mph and really you\'re doing 101mph.....but surely that\'s splitting hairs ??

*shrug*

I tend to cruise along on the m-way @ early-mid 80\'s... 5% isn\'t much for the radius to be out by and that takes you from \'safe\' to 3-points.  Or if you\'re cutting it fine and pressing on the difference between 3 points and a day in court.

The calculator online is definately very useful but I don\'t always remember what the actual vs indicated is.  

Plus we\'re mostly driving cars with speedo conversion chips that we assume are actually giving an accurate measure of speed but as it\'s all about resistances (and resistors have a margin of error by design)... it all adds up.

Simpe way round it is to use one fo the GPS radar warning systems as they give pretty accurate mph reading in real time.

Another side (apart from Danny\'s post about the sizes MAzda fitted as standard in later models) is that the suspension setup is done with the wheel/tyre combination and changing that could bugger up handling (although probably not too much).

[EVO666]

Ordering a chip this weekend to convert to MPH as it\'s still on KPH....

I see what you\'re saying about things adding up and the 3 points etc, i was only referring to the point that i seriously doubt if you would get pulled and given points for doing 33 in a 30 zone, but if you know you\'re doing over the legal limit by a fair margin then what do you expect ?? Regardless of how accurate your speedo is because of the wheels or MPH converter....

\'Can you tell me why you were doing 104mph sir.......\'

\'but officer, my speedo was saying 99mph.....\'

I dont\' think it\'s going to matter to much in that scenario ! :p

Thanks again guys, all interesting stuff !!