KDW-2 tire size?
#1
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KDW-2 tire size?
Mazda has a habit of supplying OEM tires in unusual sizes (215/50/17 Mazda6, 225/45/18 RX-8). Upon reviewing the specs for the BF Goodrich KDW-2 at tirerack, the tire is offered in the stock 225/45/18, as well as 235/40/18 and 245/40/18, the latter being closest in overall diameter to the stock size (25.9" stock vs. 25.7" for the 245/40/18). http://www.tirerack.com/tires/Spec.j...omCompare1=yes
Are there any disadvantages to going to the 245/40/18, other than an optimistic speedometer? Is it significant that the MINIMUM recommended wheel width for the 245/40/18 is 8 inches?
Along those lines, will the ODOMETER reading also be incorrect, showing more miles than actually traveled, ending the warranty earlier? I seem to recall a car dealer once telling me that there is a separate box recording miles driven, other than the display, to avoid odometer fraud. I don't know how the "box" could measure miles driven differently than the odometer, but it doesn't hurt to ask.
Are there any disadvantages to going to the 245/40/18, other than an optimistic speedometer? Is it significant that the MINIMUM recommended wheel width for the 245/40/18 is 8 inches?
Along those lines, will the ODOMETER reading also be incorrect, showing more miles than actually traveled, ending the warranty earlier? I seem to recall a car dealer once telling me that there is a separate box recording miles driven, other than the display, to avoid odometer fraud. I don't know how the "box" could measure miles driven differently than the odometer, but it doesn't hurt to ask.
Last edited by mitchfried; 10-20-2004 at 10:46 AM.
#2
Ride Naked!
245s will fit fine on an eight inch wheel. If you drive a full 40,000 miles with the 245/40x18 tire showing a 1% odometer error, you would loose a whole 400 miles off of your warrenty. Up to you but I wouldn't sweat 400 miles.
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For your information, I e-mailed BF Goodrich regarding the weight of the BF Goodrich KDW-2 in 225/45/18. The answer is 22.51 lbs. They replied:
"Mitchell,
Regarding your email: I'm considering replacing the stock tires on my RX-8
manual with 225/45/18 g-Force T/A? KDW-2 new tread. How much do they weigh
in that size?
Thank you for your email Mitchell. The KDW in this size weighs 22.51 lbs.
If we can be of further assistance, please contact us at the number listed
below.
Thank you for visiting our Web site and sending us your e-mail.
If you have additional questions, please respond to this email
or you may call us at 1-877-788-8899 (toll-free) between
8:30AM and 6:00PM Eastern Time Monday through Friday to allow
one of our Consumer Relations Representatives to assist you.
BFGoodrich Tires
Consumer Relations Department
(Please Do Not Delete the line below.)
Email ID: 1232377
"Mitchell,
Regarding your email: I'm considering replacing the stock tires on my RX-8
manual with 225/45/18 g-Force T/A? KDW-2 new tread. How much do they weigh
in that size?
Thank you for your email Mitchell. The KDW in this size weighs 22.51 lbs.
If we can be of further assistance, please contact us at the number listed
below.
Thank you for visiting our Web site and sending us your e-mail.
If you have additional questions, please respond to this email
or you may call us at 1-877-788-8899 (toll-free) between
8:30AM and 6:00PM Eastern Time Monday through Friday to allow
one of our Consumer Relations Representatives to assist you.
BFGoodrich Tires
Consumer Relations Department
(Please Do Not Delete the line below.)
Email ID: 1232377
#6
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Originally Posted by mitchfried
Are there any disadvantages to going to the 245/40/18, other than an optimistic speedometer?
Have you seen any tests of the same tire in different widths?
#7
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A search will turn up several threads on this subject... The short answer is yes it will increase grip to go to a larger size. And a 275 fits on an 8" rim too ![Wink](https://www.rx8club.com/images/smilies/wink.gif)
If you are going for BFGs, go with the KD (no w)... Much grippier (is that a word?)
consider also the Kumho and Falken tires. Just as good (maybe better) for less money
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
If you are going for BFGs, go with the KD (no w)... Much grippier (is that a word?)
consider also the Kumho and Falken tires. Just as good (maybe better) for less money
![Cool](https://www.rx8club.com/images/smilies/cool.gif)
#8
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For my needs, quicker acceleration is more important than greater grip, so I'll probably go with the 22.5 pound 225's, rather than the 26.3 pound 245's.
I'm sure it will handle just fine in the stock size.
I'm sure it will handle just fine in the stock size.
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Originally Posted by mitchfried
For my needs, quicker acceleration is more important than greater grip, so I'll probably go with the 22.5 pound 225's, rather than the 26.3 pound 245's.
I'm sure it will handle just fine in the stock size.
I'm sure it will handle just fine in the stock size.
#10
Bigus Rotus
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Originally Posted by AlexCisneros
A search will turn up several threads on this subject... The short answer is yes it will increase grip to go to a larger size. And a 275 fits on an 8" rim too ![Wink](https://www.rx8club.com/images/smilies/wink.gif)
If you are going for BFGs, go with the KD (no w)... Much grippier (is that a word?)
consider also the Kumho and Falken tires. Just as good (maybe better) for less money![Cool](https://www.rx8club.com/images/smilies/cool.gif)
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
If you are going for BFGs, go with the KD (no w)... Much grippier (is that a word?)
consider also the Kumho and Falken tires. Just as good (maybe better) for less money
![Cool](https://www.rx8club.com/images/smilies/cool.gif)
#11
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Well, then the Toyo T1S is a pretty good all around tire, and it is usually lighter than some other brands...
...BTW, I live in Miami. You don't get much wetter (how many Hurricanes was that again?)
...BTW, I live in Miami. You don't get much wetter (how many Hurricanes was that again?)
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
#13
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www.treadepot.com lists both the Toyo T1 and Toyo Proxes 4 at 24 lbs for 245/40/18. I have the Proxes 4 and am quite happy with them.
I combined the 245/40/18's with lighter Enkei 18x8 rims and ended up 3 or 4 lbs. lighter per corner than OE rims w/225 tires.
Regardless, my butt-dyno is too numb to detect any of this lightness of tiredom in normal driving conditions.
I combined the 245/40/18's with lighter Enkei 18x8 rims and ended up 3 or 4 lbs. lighter per corner than OE rims w/225 tires.
Regardless, my butt-dyno is too numb to detect any of this lightness of tiredom in normal driving conditions.
#14
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Toyo T1S is an excellent tire. My friend has an SLK with mods and he loves 'em. Only problem is he gets about 12k miles on a set, but I guess that's the trade-off.
#15
Momentum Keeps Me Going
I sure like the comments on the KDs on Tirerack and called BFGoodrich to get some weights on the following:
-------------------KD--------------KDW
225/45/18......22.5
225/40/18......24.56..............22.89
225/45/17......23.46..............23.77
245/40/17......25.31..............24.6
more food for thought, I'm suprised our 225/45/18 are the lightest of the bunch?
-------------------KD--------------KDW
225/45/18......22.5
225/40/18......24.56..............22.89
225/45/17......23.46..............23.77
245/40/17......25.31..............24.6
more food for thought, I'm suprised our 225/45/18 are the lightest of the bunch?
#16
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Originally Posted by Ned M
www.treadepot.com lists both the Toyo T1 and Toyo Proxes 4 at 24 lbs for 245/40/18. I have the Proxes 4 and am quite happy with them.
1) the same handling
2) slightly worse handling
3) slightly better handling
I am trying to decide if all-season tires are ok for my non-winter use (I have Toyo Garitt HT's for the winter), or if I should go for pure summer tires (like the T1-S or KDW NT).
#17
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Go with the summer tires if you have winter tires. Summer tires will outperform all-seasons even in the wet, as long as the temp is above 40 or 50 degrees and there is enough tread to resist hydroplaning. The T1-Ss is a great three season tire (had 'em on my Miata) if you don't mind the soft turn-in.
No reason to compromise in the spring, summer and fall if you already have winter tires.
No reason to compromise in the spring, summer and fall if you already have winter tires.
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