Hi all. I'm pretty new to the whole topic of custom rims/tires but have been reading up on it and learning. Though was hoping someone could confirm that what I understand is correct.
Currently, I have a 2013 Honda Civic:
Tire size: 195/65/R15 (what I have now).
Rim size: 6Jx15 ET45.
What I'm thinking of switching out to:
Rims (already bought as was very cheap): 8Jx18 ET50.
Tires (have a good deal for as well): 225/40/ZR18.
Looking at tiresize.com/calculator/, this means that the diameter for the tire only increases by 3mm and the width by 20mm.
And looking at willtheyfit.com, it says that the new wheel will have an inner rim which is 30.4mm closer to the suspension strut. The speed reading change isn't significant either.
Based on what I've read, a tire diameter increase of 20mm should be okay, correct? And the 30.4mm should be fine as well? Just trying to get a good idea of A) will these all fit correctly, and B) is it a bad idea to go this big when considering my car and all that?
Any help in making sure my assumptions are all correct would be appreciated!