can 345 tires be fit on 18" or 19" rims on a GTS without any problems?
345 tires?
- Thread starter Viper Specialty
- Start date
Butch The Snake
Enthusiast
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Final GTS:
can 345 tires be fit on 18" or 19" rims on a GTS without any problems?
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can 345 tires be fit on 18" or 19" rims on a GTS without any problems?
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BigCarrot
Enthusiast
I'm getting mine put on monday. I'll post the results.
grayman
Enthusiast
Have 345 19"s on back of 00 GTS. No problems at all. Looks great
OP
OP
yeah, they have an advantage when it comes to contact patch. But as with any wider tire, they will get into ruts a little more.
V10 MOJO
Enthusiast
how much wider are they and what brand/make/model is recommended. im all for the steamroller look, and with 3:55 gears coming monday i think a little extra contact could only be of benefit.
toddt
Enthusiast
I was told my my tire guy that 345's weren't available in Pilot Sports for 18"
garolittle
Enthusiast
Call Jon B. at Parts Rack. He may have what you need.
Mike Brunton
Enthusiast
a 345 tire is only 10mm wider than a 335 - about the width of your pinkie.
If you look close, you will see that the factory 335 tire is actually stretched onto that rear rim a little bit - the sidewall sort of stretches around to accomodate the tire.
A 345 is actually a much better size for the rear rim than a 335, IMO.
I dont think a 345 is going to make a significant difference in handling because a 335 is already so wide - it's only about 4% larger. You will notie it a big and it will fill the wheelwells better. It should flatten out the tread a little too around the edges and give a better contact patch.
If you look close, you will see that the factory 335 tire is actually stretched onto that rear rim a little bit - the sidewall sort of stretches around to accomodate the tire.
A 345 is actually a much better size for the rear rim than a 335, IMO.
I dont think a 345 is going to make a significant difference in handling because a 335 is already so wide - it's only about 4% larger. You will notie it a big and it will fill the wheelwells better. It should flatten out the tread a little too around the edges and give a better contact patch.
genXgts
Enthusiast
good points Mike, and the extra 10 mms seem to be enough to have the rubber become the initial point of contact with curbs, instead of the rim, which is a bonus as well!
BlackACR
Enthusiast
DgeViper1, nice car. Anyway, My buddy is getting a set of 345/45/18 Pilot Sports mounted today. Hopefully, they will hold a little better on nitrous that the stock 335's.
Chuck 98 RT/10
Enthusiast
Go with 345.
Anthony - 98 GTS
Enthusiast
I have 345 Michelin Pilot Sports on my 19's.
V10 MOJO
Enthusiast
is 345/45/18 recommended or 345/35/18?
Anthony - 98 GTS
Enthusiast
rdustman,
It should be 345/35/18. The 19's are 345/30/19.
It should be 345/35/18. The 19's are 345/30/19.
Russ M
Enthusiast
Yes they make a 345 18, its a pilot. The only problem is that the tire is a 35 series vs. 30 factory, which will make your gearing even longer.
The over all difference between the 2 tires is very substantial, 1 inch wider tire patch(12.9 vs. 13.9), and 1 inch taller. This is information given out by the manufacturer of the tire.
The over all difference between the 2 tires is very substantial, 1 inch wider tire patch(12.9 vs. 13.9), and 1 inch taller. This is information given out by the manufacturer of the tire.
BlackACR
Enthusiast
Sorry, typo. 345/35/18 Pilot Sport.
FastMatt
Enthusiast
DgeViper1
YES THY WILL FIT IN THE acr RIMS, i HAVE THEM ON MY 2000ACR
YES THY WILL FIT IN THE acr RIMS, i HAVE THEM ON MY 2000ACR
treynor
Enthusiast
> The over all difference between the 2 tires is very substantial, 1 inch wider tire patch(12.9 vs. 13.9), and 1 inch taller. This is information given out by the manufacturer of the tire
Err, that IS surprising. I know manufacturers don't always match tread width exactly to the value stated, but 335 -> 345 adding a full inch to tread width?? Can you provide a pointer to this info.
Err, that IS surprising. I know manufacturers don't always match tread width exactly to the value stated, but 335 -> 345 adding a full inch to tread width?? Can you provide a pointer to this info.
If you want a wider tire then you need to go with 345/30/18's which I do not think anyone makes. If anyone finds a maker for 345/30/18's let me know. 335/30/18's are actually 10.25mm wider and 10.125mm lower than 345/35/18's. That is because the second number is the aspect ratio. The second number is a total percentage of the sidewall height.
Thus for both sides of the sidewall (inner and outer) on a 345/35 tire the height = 345mm*(.175*2) = 120.75mm or 60.375mm each sidewall. You take 345mm-120.75mm and you total contact patch or width = 224.25mm.
On a 335/30 tire the height = 335mm*(.15*2) = 100.50mm or 50.25mm for each side of the sidewall. You take 335mm-100.50mm and your total contact patch 234.50mm.
You can work out the same formula for a 345/30 tire to see how much wider it is than a 335/30.
Gearing will be higher with the 10.125mm taller 345/35 vs 335/30 tire thus you will lose a tiny bit of low end punch.
All in all if you should go with 345/30 on 18's or stick with 335/30's and not 345/35's for the above reasons.
Thus for both sides of the sidewall (inner and outer) on a 345/35 tire the height = 345mm*(.175*2) = 120.75mm or 60.375mm each sidewall. You take 345mm-120.75mm and you total contact patch or width = 224.25mm.
On a 335/30 tire the height = 335mm*(.15*2) = 100.50mm or 50.25mm for each side of the sidewall. You take 335mm-100.50mm and your total contact patch 234.50mm.
You can work out the same formula for a 345/30 tire to see how much wider it is than a 335/30.
Gearing will be higher with the 10.125mm taller 345/35 vs 335/30 tire thus you will lose a tiny bit of low end punch.
All in all if you should go with 345/30 on 18's or stick with 335/30's and not 345/35's for the above reasons.
treynor
Enthusiast
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR> 335/30/18's are actually 10.25mm wider and 10.125mm lower than 345/35/18's. That is because the second number is the aspect ratio. The second number is a total percentage of the sidewall height.
Thus for both sides of the sidewall (inner and outer) on a 345/35 tire the height = 345mm*(.175*2) = 120.75mm or 60.375mm each sidewall. You take 345mm-120.75mm and you total contact patch or width = 224.25mm.
<HR></BLOCKQUOTE>
Err, how to put this delicately... that turns out not to be the case. The first # is the width of the tire in mm. The second # is sidewall height as a percentage of the width. The third number is of course the wheel diameter in inches. Sooo... a 345/35 is (theoretically, anyway) 10mm wider and (345*.35 - 335*.30=) 20.25mm taller than a 335/30.
For those with a further interest in comparisons, see http://www.csgnetwork.com/tireinfo4calc.html
Thus for both sides of the sidewall (inner and outer) on a 345/35 tire the height = 345mm*(.175*2) = 120.75mm or 60.375mm each sidewall. You take 345mm-120.75mm and you total contact patch or width = 224.25mm.
<HR></BLOCKQUOTE>
Err, how to put this delicately... that turns out not to be the case. The first # is the width of the tire in mm. The second # is sidewall height as a percentage of the width. The third number is of course the wheel diameter in inches. Sooo... a 345/35 is (theoretically, anyway) 10mm wider and (345*.35 - 335*.30=) 20.25mm taller than a 335/30.
For those with a further interest in comparisons, see http://www.csgnetwork.com/tireinfo4calc.html
Remember 3 other things:
Lower C.G. = better handling. Period. When you choose a taller aspect tire that is 1.2" taller, you RAISE the car by half that amount = .6 inches. This creates a HIGHER C.G., not desirable in a road-race car, but not too important in a straighliner.
Most folks like the Viper body LOWERED .6 - 1.0 inches...you just RAISED it, and filled the annoying tirewell gap with rubber, giving a placebo of a filled tirewell. Instead, lower the car ! Costs only $300 parts + install and a re-alighnment. No new tires or wheels to buy. Better handling, better ride, less $$. Then again, you could do BOTH.
The taller tire = taller/higher gearing, as mentioned. It also results in a speedo error. The rolling circumference of the tire is greater, so the speedo reads too low. You are actually going FASTER than speedo reads by a few percent.
Commercial: PartsRack has the tires at great prices.
Lower C.G. = better handling. Period. When you choose a taller aspect tire that is 1.2" taller, you RAISE the car by half that amount = .6 inches. This creates a HIGHER C.G., not desirable in a road-race car, but not too important in a straighliner.
Most folks like the Viper body LOWERED .6 - 1.0 inches...you just RAISED it, and filled the annoying tirewell gap with rubber, giving a placebo of a filled tirewell. Instead, lower the car ! Costs only $300 parts + install and a re-alighnment. No new tires or wheels to buy. Better handling, better ride, less $$. Then again, you could do BOTH.
The taller tire = taller/higher gearing, as mentioned. It also results in a speedo error. The rolling circumference of the tire is greater, so the speedo reads too low. You are actually going FASTER than speedo reads by a few percent.
Commercial: PartsRack has the tires at great prices.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by treynor:
Err, how to put this delicately... that turns out not to be the case. The first # is the width of the tire in mm. The second # is sidewall height as a percentage of the width. The third number is of course the wheel diameter in inches. Sooo... a 345/35 is (theoretically, anyway) 10mm wider and (345*.35 - 335*.30=) 20.25mm taller than a 335/30.
For those with a further interest in comparisons, see http://www.csgnetwork.com/tireinfo4calc.html
<HR></BLOCKQUOTE>
So what are you disagreeing with?
You are correct that 345/35 is 10mm wider than 335/30, but that is outer rim to inner rim. The contact patch on a 345/35 is actually 10.125mm narrower than a 335/30. Do the math again. You plug in the numbers and my calculations above do add up (18 inches x 25mm = 450mm where 1inch = 25mm). <b>That conversion utility does not measure contact patch or width not including sidewall and that is what I am talking about.</b> Bottom line is that a 345/35 is (and will look) taller and narrower (contact area width) than a 335/30. Compare in person if you can and bring a soft measuring tape also and then you will see what I am talking about.
Err, how to put this delicately... that turns out not to be the case. The first # is the width of the tire in mm. The second # is sidewall height as a percentage of the width. The third number is of course the wheel diameter in inches. Sooo... a 345/35 is (theoretically, anyway) 10mm wider and (345*.35 - 335*.30=) 20.25mm taller than a 335/30.
For those with a further interest in comparisons, see http://www.csgnetwork.com/tireinfo4calc.html
<HR></BLOCKQUOTE>
So what are you disagreeing with?
You are correct that 345/35 is 10mm wider than 335/30, but that is outer rim to inner rim. The contact patch on a 345/35 is actually 10.125mm narrower than a 335/30. Do the math again. You plug in the numbers and my calculations above do add up (18 inches x 25mm = 450mm where 1inch = 25mm). <b>That conversion utility does not measure contact patch or width not including sidewall and that is what I am talking about.</b> Bottom line is that a 345/35 is (and will look) taller and narrower (contact area width) than a 335/30. Compare in person if you can and bring a soft measuring tape also and then you will see what I am talking about.
BigCarrot
Enthusiast
Hey Jon, did you send me an email today titled "language" or did I just recieve a virus? I haven't opened it. I've never talked to you, so I thought I'd ask.
treynor
Enthusiast
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR> So what are you disagreeing with? You are correct that 345/35 is 10mm wider than 335/30, but that is outer rim to inner rim. The contact patch on a 345/35 is actually 10.125mm narrower than a 335/30. Do the math again.
<HR></BLOCKQUOTE>
Few have challenged me in math and survived to tell about it, Artman. It doesn't appear that you'll be joining that select group
So to be clear, by your calculations you appear to believe that the 335 figure is the combined inner sidewall height, outer sidewall height, and tread width. This is patently false.
As a simple counterexample, have a look at the 275/70-16 tires on your LX470 when you next get a chance. Your logic says that 70% of that 275mm figure is actually sidewall, and therefore the tread width on those tires is 275mm * (100%-70%), or 82.5mm. You won't even need a measuring tape. Does that tread LOOK like it's 3.3 inches wide? Nooooo, it sure doesn't
Looks more like it's 11 inches wide to me, just like it's supposed to be
<HR></BLOCKQUOTE>
Few have challenged me in math and survived to tell about it, Artman. It doesn't appear that you'll be joining that select group
So to be clear, by your calculations you appear to believe that the 335 figure is the combined inner sidewall height, outer sidewall height, and tread width. This is patently false.
As a simple counterexample, have a look at the 275/70-16 tires on your LX470 when you next get a chance. Your logic says that 70% of that 275mm figure is actually sidewall, and therefore the tread width on those tires is 275mm * (100%-70%), or 82.5mm. You won't even need a measuring tape. Does that tread LOOK like it's 3.3 inches wide? Nooooo, it sure doesn't
Hmmmm, good point Ben.
My math may be right, but theory may be wrong..... Although, you cannot say that a 275/60 is the same width (contact patch) than a 275/35. I swear though that the last time I was at dealer shopping for my car, they had one with 345/35 michelins and it appeared slightly narrower (and obviously taller) than the one they had stock. Oh well, I still think 335/30 or 345/30 (unavailable) would be best on a stock 18.
. Later.
