tire upsizing
03-16-01, 09:37 AM
#1
Driver
Thread Starter
Join Date: Mar 2001
Posts: 189
Likes: 0
Received 0 Likes
on
0 Posts
a few questions from a tire novice:
1) Why do people put different size tires on their stock rims? Example: I read about someone putting 245/40/17 tires on the stock 17" rims. What are the implications/benefits/fitting issues? The one part I can figure out myself is that you change the overall diameter by a third of an inch; that obviously screws with your speedo/odo. It seems you shouldn't be able to change tire sizes without changing rims, but I guess there's a little play in fitting on a given rim. I'm in need of new tires, and will get the stock 235/45/17 tires by default, unless the answer enlightens me.
2) What is this characterisic of tire performance known as "turn-in"?
thanks.
1) Why do people put different size tires on their stock rims? Example: I read about someone putting 245/40/17 tires on the stock 17" rims. What are the implications/benefits/fitting issues? The one part I can figure out myself is that you change the overall diameter by a third of an inch; that obviously screws with your speedo/odo. It seems you shouldn't be able to change tire sizes without changing rims, but I guess there's a little play in fitting on a given rim. I'm in need of new tires, and will get the stock 235/45/17 tires by default, unless the answer enlightens me.
2) What is this characterisic of tire performance known as "turn-in"?
thanks.
03-16-01, 08:05 PM
#2
Lexus Fanatic
iTrader: (20)
Sometimes you can put wider tires on the same rims, and the differences are in handling, and cosmetics.
Re: handling - generally wider rubber grips better.
Re: cosmetics - wider rubber can look better, and a bigger circumference can make the tire fill the wheel well better.
245/40/17 is actually 2.4% SMALLER in circumference than 235/45/17 according to my spreadsheet, so I'd say this will LOOK WORSE because of a bigger wheel gap.
Some people go for a bigger overall diameter, e.g., 245/45 because that fills the wheel a bit better. That size would be just 1.4% bigger circumference.
These percentages show what the speedo/odo would be off... and a 2% diff is just 1.2mph at 60, so it's nothing serious.
Hope that helps!
FYI, I got 235/40/18s on the front, and they're almost the same size as the stock 235/45/17s. I now wish I'd gotten 245/40/18s though so they'd fill out the wheel well a bit more. Nothing major though, I feel my wheels/tires definitely look better than stock, and with my much wider rims/tires on the back (265/35/18s on 9.5" wide rims) it fills the width of the wheel well really nicely.
Re: handling - generally wider rubber grips better.
Re: cosmetics - wider rubber can look better, and a bigger circumference can make the tire fill the wheel well better.
245/40/17 is actually 2.4% SMALLER in circumference than 235/45/17 according to my spreadsheet, so I'd say this will LOOK WORSE because of a bigger wheel gap.
Some people go for a bigger overall diameter, e.g., 245/45 because that fills the wheel a bit better. That size would be just 1.4% bigger circumference.
These percentages show what the speedo/odo would be off... and a 2% diff is just 1.2mph at 60, so it's nothing serious.
Hope that helps!
FYI, I got 235/40/18s on the front, and they're almost the same size as the stock 235/45/17s. I now wish I'd gotten 245/40/18s though so they'd fill out the wheel well a bit more. Nothing major though, I feel my wheels/tires definitely look better than stock, and with my much wider rims/tires on the back (265/35/18s on 9.5" wide rims) it fills the width of the wheel well really nicely.
03-17-01, 05:51 PM
#4
Lexus Fanatic
iTrader: (20)
Dang, didn't know there was a meet!?
Will check the forum... (too many places to check here!)
Will check the forum... (too many places to check here!)
03-17-01, 05:54 PM
#5
Lexus Fanatic
iTrader: (20)
OK, I checked, no meet.
Anyway Jazziz, yeah I was around today, but busy with some errands. I'm around tomorrow though... whyzzat?
Anyway Jazziz, yeah I was around today, but busy with some errands. I'm around tomorrow though... whyzzat?
Thread
Thread Starter
Forum
Replies
Last Post
