NASCARLANCE wrote:
Chiller what size tires are you running? I'm thinking of going up to 17's and was wondering how much it affects ride quality and the MPH reading?
Anyone running 18's could you also answer the same questions?
Thanks in advance,NL
on the 17x7.5 rims i was running 235/45/17
on the new 17x7's i'm using now i'm running a 225/45/17
if we are going on a purley mathematical standpoint the overall circumference of a stock J30 tire (215/60/15) is 2006.8 mm
the 235/45/17 tire is 2020.3mm....about 0.68% too big, meaning that when you are going 60MPH from the police radar gun your gauge on your speedo is going to be showing 'only' roughly 59.5MPH (are you going to notice a difference on your gauge of 1/2 a MPH? i doubt it)
the 225/45/17 tire is only 1992.3mm so this one is about 0.72% too small...which means that at 60mph on the police radar gun your speedo gauge is going to be showing you 60.4mph....
seriously, are your eyes and body going to notice 1/2 mph on either side of 60? i doubt it...
as for ride quality the 235 and 225 are alot stiffer then stock by virtue of the short short sidewall, wider rubber and bigger rim...ride quality isn't bad by any means i like it...however that is all in the tire that you buy, i have had yokohama Avid's on there and the ride is very stiff, and I've had 2 sets of Kumho's and they were alot softer and definitely more comfortable to drive along the highway...
my 2 cents...