Downside to 305/30R20 on Rear Wheels
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Downside to 305/30R20 on Rear Wheels
I'm currently at the EOL for my Pzeros and want to try MP4S tires for a change this go around per a lot of members reviews. I am now deciding between 295 or 305 on stock rear wheels.
I've perused through the various tire size forums but I am wondering if anyone has any feedback regarding unintended consequences of increasing the rear tire size to 305. I like the look of the wider tires but want to know if there are any pitfalls. I'm not horribly concerned with grip difference as that discussion has been beaten to death in previous threads.
Does anyone have a picture with 305/30R20 tires on stock setup with jag's 20" rear wheels? I am wondering if tires will bow out and look funny over rim or if they look like stock tires. I saw a picture of a tire on one of the tire threads on this forum that looked like it was crammed on the wheel and about to explode but not sure which size it was from the description - definitely don't want that.
Any issues with speed/handling of car with wider tires? I ran the question by my local Jag service rep, as he is a good guy and I trust his judgement, and it doesn't look like there are any warranty issues or mechanical risks so long as the tires are the same diameter. Wouldn't a 305 be slightly larger in diameter with the same AR?
Hoping someone with experience with both tires could chime in and give quick pros/cons of each. The wider tires look nice but want to be sure there are no unintended consequences of sizing up.
I've perused through the various tire size forums but I am wondering if anyone has any feedback regarding unintended consequences of increasing the rear tire size to 305. I like the look of the wider tires but want to know if there are any pitfalls. I'm not horribly concerned with grip difference as that discussion has been beaten to death in previous threads.
Does anyone have a picture with 305/30R20 tires on stock setup with jag's 20" rear wheels? I am wondering if tires will bow out and look funny over rim or if they look like stock tires. I saw a picture of a tire on one of the tire threads on this forum that looked like it was crammed on the wheel and about to explode but not sure which size it was from the description - definitely don't want that.
Any issues with speed/handling of car with wider tires? I ran the question by my local Jag service rep, as he is a good guy and I trust his judgement, and it doesn't look like there are any warranty issues or mechanical risks so long as the tires are the same diameter. Wouldn't a 305 be slightly larger in diameter with the same AR?
Hoping someone with experience with both tires could chime in and give quick pros/cons of each. The wider tires look nice but want to be sure there are no unintended consequences of sizing up.
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powerhouse (02-16-2019)
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BruceTheQuail (02-15-2019)
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And there are no warranty implications if something should go awry with the wheels, somehow, having the wrong size tire?
I've seen a few pics of 305s on stock 10.5" wheels and some look really bowed out, others not so much - maybe different aspect ratios or something. Really don't want to look like I'm riding on inner-tubes.
Anyone have any pictures by chance of MP4S or any other 305/30R20 tires on their stock wheels?
I've seen a few pics of 305s on stock 10.5" wheels and some look really bowed out, others not so much - maybe different aspect ratios or something. Really don't want to look like I'm riding on inner-tubes.
Anyone have any pictures by chance of MP4S or any other 305/30R20 tires on their stock wheels?
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I have the 265 and 305's on stock wheels. Car is in garage for winter. Not sure what kind of photo I can get, but I'll give it a try. This set up will only be until April, when new 9.5 and 11 inch new two piece forged wheels are expected. The 10 mm extra is divided so it's only 5 mm per side.
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powerhouse (02-17-2019)
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jaguny (02-17-2019)
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Wouldn’t the match for the 305/30/20 be the 265/35/20? The 305 has a 764 revolutions per mile and the 265/30 has 791. The 265/35 is 761 almost an exact match. I am specifically speaking about the AWD cars. I understand they are basically RWD until you need it but what about driving in snow/rain mode? Is it a basic esthetic thing?
The OEM’s match at 770 perfectly. I would never want to stress the AWD system having the front and rear working against each other fully understanding its not a direct link. But still.
The OEM’s match at 770 perfectly. I would never want to stress the AWD system having the front and rear working against each other fully understanding its not a direct link. But still.
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Wouldn’t the match for the 305/30/20 be the 265/35/20? The 305 has a 764 revolutions per mile and the 265/30 has 791. The 265/35 is 761 almost an exact match. I am specifically speaking about the AWD cars. I understand they are basically RWD until you need it but what about driving in snow/rain mode? Is it a basic esthetic thing?
The OEM’s match at 770 perfectly. I would never want to stress the AWD system having the front and rear working against each other fully understanding its not a direct link. But still.
The OEM’s match at 770 perfectly. I would never want to stress the AWD system having the front and rear working against each other fully understanding its not a direct link. But still.
Given:
1) As most say there will be no traction improvement going to 305 (at least wrt to wheelspin)
2) Any size PS4S will be light years ahead of the stock P Zero
2) OP has stock wheels, 295's seem to sit perfectly on factory wheels
3) Price is higher for 305's
4) Esthetically, spacers and lowering springs would do more for the appearance of the car than upping tire size. And with increased tire size, there is less room for a proper spacer.
To me it's a no brainer, save $$ and stick with stock sizes...
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RichardCranium (07-17-2019)
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Looks like OP has a RWD car, so he will have some flexibility on front size. Personally, for appearance sake I prefer 265/30/20 for the front over 265/35/20 which starts to sport too tall a sidewall IMHO. That issue aside for the moment, why is the OP stressing over this?
Given:
1) As most say there will be no traction improvement going to 305 (at least wrt to wheelspin)
2) Any size PS4S will be light years ahead of the stock P Zero
2) OP has stock wheels, 295's seem to sit perfectly on factory wheels
3) Price is higher for 305's
4) Esthetically, spacers and lowering springs would do more for the appearance of the car than upping tire size. And with increased tire size, there is less room for a proper spacer.
To me it's a no brainer, save $$ and stick with stock sizes...
Given:
1) As most say there will be no traction improvement going to 305 (at least wrt to wheelspin)
2) Any size PS4S will be light years ahead of the stock P Zero
2) OP has stock wheels, 295's seem to sit perfectly on factory wheels
3) Price is higher for 305's
4) Esthetically, spacers and lowering springs would do more for the appearance of the car than upping tire size. And with increased tire size, there is less room for a proper spacer.
To me it's a no brainer, save $$ and stick with stock sizes...
From just about everybody's experience, I do expect a better overall tire than the Pzero regardless of size I choose so it'll be a PS4S for me for sure. I'm thinking our RWD models may benefit from the improved compound even more than the AWD models.
I'm just trying to flesh out any negative impact a 305 tire might have. Primarily trying to figure out what a 305/30R20 looks like on stock rears. I have seen some wheel images that weren't clearly labeled in other threads and the tires look like are about to pop; the side walls bow out so much. Definitely want to avoid that, but as jaguny noted it's only 5mm on each side, not much at all really. I'm beginning to think the images I saw were of a completely different size tire.
I do have a RWD 14' so not too concerned about spin rate for front vs back, will probably keep front tires the stock size but may up size those as well.
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jcb-memphis (05-07-2022)
#19
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powerhouse (02-17-2019)