Rear Tires
Thread Starter
3rd Gear Member
Joined: Nov 2005
Posts: 794
From:
Rear Tires
Any suggestions on replacement rear tires, that have the same sidewall "50" height? Wanted to keep the same height as the oem fronts, but wanted to go wider in the rear.
Current 235/50/ZR18 Bridgestone all around.
Thanks
Current 235/50/ZR18 Bridgestone all around.
Thanks
5th Gear Member
Joined: Jan 2006
Posts: 2,398
From: Florida
RE: Rear Tires
The wider the tire, the lower the sidewall is going to be. For your 235/50... That means your sidewall is 50% the width of your tire. So if you go a wider tire, it's going to be a smaller percentage.
Here is a good way to calculate things.
Example tire.
275/40/18
275 divided by 25.4 = 10.83 Rounded. (Meaning your tire is 10.83 inches wide.)
10.83 multiplied by 40% = 4.33 (The height of your sidewall in inches.)
4.33 multiplied by 2, plus the size of your wheel (18) = 26.7 inches. (Tire height.)
Stock tire
235/50/18
235 divided by 25.4 = 9.25
9.25 multipled by 50% = 4.625
4.625 multipled by 2, plus the size of your wheel (18) = 27.25.
The end result, the wider tire is smaller in height then your stock tire. So what you need to do is calculate various tire sizes and find the best one that matches your stock heigh, if that is what you want.
Hope this helps.
-Menace.
Here is a good way to calculate things.
Example tire.
275/40/18
275 divided by 25.4 = 10.83 Rounded. (Meaning your tire is 10.83 inches wide.)
10.83 multiplied by 40% = 4.33 (The height of your sidewall in inches.)
4.33 multiplied by 2, plus the size of your wheel (18) = 26.7 inches. (Tire height.)
Stock tire
235/50/18
235 divided by 25.4 = 9.25
9.25 multipled by 50% = 4.625
4.625 multipled by 2, plus the size of your wheel (18) = 27.25.
The end result, the wider tire is smaller in height then your stock tire. So what you need to do is calculate various tire sizes and find the best one that matches your stock heigh, if that is what you want.
Hope this helps.
-Menace.
2nd Gear Member
Joined: Jun 2005
Posts: 200
From:
6th Gear Member
Joined: Jan 2006
Posts: 6,054
From: Laredo, TEXAS
RE: Rear Tires
ORIGINAL: Menace
The wider the tire, the lower the sidewall is going to be. For your 235/50... That means your sidewall is 50% the width of your tire. So if you go a wider tire, it's going to be a smaller percentage.
Here is a good way to calculate things.
Example tire.
275/40/18
275 divided by 25.4 = 10.83 Rounded. (Meaning your tire is 10.83 inches wide.)
10.83 multiplied by 40% = 4.33 (The height of your sidewall in inches.)
4.33 multiplied by 2, plus the size of your wheel (18) = 26.7 inches. (Tire height.)
Stock tire
235/50/18
235 divided by 25.4 = 9.25
9.25 multipled by 50% = 4.625
4.625 multipled by 2, plus the size of your wheel (18) = 27.25.
The end result, the wider tire is smaller in height then your stock tire. So what you need to do is calculate various tire sizes and find the best one that matches your stock heigh, if that is what you want.
Hope this helps.
-Menace.
The wider the tire, the lower the sidewall is going to be. For your 235/50... That means your sidewall is 50% the width of your tire. So if you go a wider tire, it's going to be a smaller percentage.
Here is a good way to calculate things.
Example tire.
275/40/18
275 divided by 25.4 = 10.83 Rounded. (Meaning your tire is 10.83 inches wide.)
10.83 multiplied by 40% = 4.33 (The height of your sidewall in inches.)
4.33 multiplied by 2, plus the size of your wheel (18) = 26.7 inches. (Tire height.)
Stock tire
235/50/18
235 divided by 25.4 = 9.25
9.25 multipled by 50% = 4.625
4.625 multipled by 2, plus the size of your wheel (18) = 27.25.
The end result, the wider tire is smaller in height then your stock tire. So what you need to do is calculate various tire sizes and find the best one that matches your stock heigh, if that is what you want.
Hope this helps.
-Menace.
1st Gear Member
Joined: Jan 2006
Posts: 52
From:
RE: Rear Tires
Menace,
I'm not a tire expert but the statement you made as to "the wider the tire, the lower the sidewall is going to be" cannot be correct. If you stay in the same series, say 40 for example, 40% of a larger number is always greater than a smaller number, so the wider the tire, the taller the tire (more sidewall). In the example you gave, Praxtec would need a 295/40/18 to get the same height (very close) to the 50 series he has in front. Thats assuming that Bridgestone makes a 295/40/18 in the same tire & tread pattern.
4.625/.4=11.56(needed width in 40 series) 11.56*25.4=293.6 tire size needed in 40 series
If my thinking is wrong, I am sure I will be corrected.
I'm not a tire expert but the statement you made as to "the wider the tire, the lower the sidewall is going to be" cannot be correct. If you stay in the same series, say 40 for example, 40% of a larger number is always greater than a smaller number, so the wider the tire, the taller the tire (more sidewall). In the example you gave, Praxtec would need a 295/40/18 to get the same height (very close) to the 50 series he has in front. Thats assuming that Bridgestone makes a 295/40/18 in the same tire & tread pattern.
4.625/.4=11.56(needed width in 40 series) 11.56*25.4=293.6 tire size needed in 40 series
If my thinking is wrong, I am sure I will be corrected.
5th Gear Member
Joined: Jan 2006
Posts: 2,398
From: Florida
RE: Rear Tires
No, it isn't the case in all aspects. Though I was just trying to make clear to Praztek that if he went with a wider tire, and trying to find the same 50% Sidewall that his skinner tire had, that they wouldn't be the same height. Meaning, he would have to look for the tires he wants, and then calculate them using the method I provided to find a tire that had a height the same as stock. Make sense?
Sorry for the confusion,
Menace.
Sorry for the confusion,
Menace.
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