First of all accept my excuses if I'm posting a duplicated question, but I read quite a bit the previous posts without finding the answer.
Just bought a V 1.6 mpi and I'm happy with it; yesterday drove at 150km/h (~90 miles) and it has a really nice grip, handling,...
But still not that comfortable for a city ride, guess it has to do too with the 215/40 18" tire(hankook ventus 2). Previous posts suggests that comfort can be improved by a tire with higher side wall. 225/40 is a safe bet. But I still would like to give a further step considering:
- the rule of thumb that says that tires should not exceed 3% of the original diameter;
- lighter tires and lower UTQG may be better (not sure, let's skip these variables);
- despite common impression that wider tires are more comfortable: I read a collumnist, citing a German study, saying that wider tires decrease comfort (cannot double check since I can't read German);
- My prime objective is to increase comfort (sidewall height) not braking, fuel economy, odometer,...
so, I came down to three alternatives:
a) 225/40 18" : safe choice;
b) 235/40 18" : change circunference by 2.5%, increase side wall by 8mm or 9% and width by 20mm or 9% too;
c) 215/45 18" : same width of the original, increase sidewall by 11mm or 12.5% and circunference by 3.4%;
I would like to go, eventually, with alternative "c" despite exceed the 3% rule of thumb and, after all, we are talking about of just a few more mm so I guess they will fit without eventual rubbing. Thus, my questions are: first, if someone has tried alternatives b & c; secondly, if a tire expert out there can drop a few lines to comment on the alternatives.
Thanks in advance and sorry for the long post,
P.S.: Some interesting sites below:
Ejelta.com: Tire Size Calculator: 215/40-18
215/40-R18 vs 215/45-R18 Tire Comparison - Tire Size Calculator
P.P.S: I'm not considering changing the wheel size to 17"