BuzzPuppy

OZVR4 Ambassador
Lifetime Member
Location
Victoria
First Name
Gavin
Drive
レグナム Super VR-4
For all who are curious if there were to be changes to upsizing tyres and the like, it cuts down on the calculations by plugging in all the values yourself.

http://www.miata.net/garage/tirecalc.html


For example, the standard Legnum/Galant uses 205/55-R16, and has a diameter of 631.9mm, whereas according to this, upgrading to 17" rims with 215/45-R17 drops diameter down to 625.3mm
 

naughtika

OzVR4 Stalker
Moderator
Trader
Location
Brisbane, QLD
First Name
Christian
Drive
'96 Galant VR4, '17 MB A180, '25 Macan GTS
maybe that's why my tyre guy decided to put on 205/50r17

I need new tyres.. damn it..
 

bradc

1 AYC Bar
Location
New Zealand
First Name
Brad
Drive
Facelift Manual 400hp VR-4 Legnum
215/50/17 is actually a good option too, but most people put on 215/45/17.

225/45/17 is the ideal size imho for 17" tyres, very close to the stock radius, and you can go anywhere from 35 to 45mm offset without any rubbing problems.
 

bradc

1 AYC Bar
Location
New Zealand
First Name
Brad
Drive
Facelift Manual 400hp VR-4 Legnum
with 17x7 the best sizes are 215/45 which is slightly undersized and 215/50 which is slightly oversized.
 

2000VR-4

Leaving Skid Marks
Location
Angle Vale
First Name
Jason
Drive
1988 Magna (Daily) 1975 GC Galant hardtop (W/End car) 1972 GS Galant hardtop, 1973 Galant GTO X-II, 1978 Galant (Scorpion) hardtop
I got 225/40 on my 18x8's +35, should fill the gaurds nicely and they have just a slight stretch and it works out dam near perfect, only .6kph over at 60kph.
 
G

Guest

Unregistered
mine are similar 235/40 on 18x8.5's + 35 a bit streched.

Using a Navman the GPS speed and dash speed are perfect, both are the same.
This is the first car that has acctually been spot on with the speed indication.
 

bradc

1 AYC Bar
Location
New Zealand
First Name
Brad
Drive
Facelift Manual 400hp VR-4 Legnum
it wouldn't be with the stock wheels though :)

I found something similar, with the stock 225/50/16 wheels it would under-read a little bit, but with 235/45/17's on it is perfect.
 
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