20" Rear Tire Thread - 295/35R20, 305/35R20, etc...
#61
01-10-2017, 07:00 PM
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jbyeatman (12-28-2019)
#62
01-10-2017, 07:10 PM
Veteran Member
I have wondered why too. I'm not clever enough to know if that would affect the handling.
#63
01-10-2017, 07:10 PM
Woa take it easy buddy... I was just asking a question, I never understood why people are so aggressive on forums, but whatever.
What I was saying is that my question was pretty specific, and I know/remember a bunch of members posting that they have 305 on 10.5 inch wheels. Once someone has them there is very little reason for them to inquire or go through every post of a thread such as this; but I guess none of that matters your highness.
What I was saying is that my question was pretty specific, and I know/remember a bunch of members posting that they have 305 on 10.5 inch wheels. Once someone has them there is very little reason for them to inquire or go through every post of a thread such as this; but I guess none of that matters your highness.
#64
01-10-2017, 07:14 PM
Veteran Member
I would expect most members to have email subscriptions turned on automatically (the default) so the contributors to this thread will receive an email telling them there has been a new post on this topic. I believe that it what Cambo was referring to when he said they would have an interest in this thread.
#65
01-10-2017, 07:18 PM
Do Lizard's photos in post 31 answer your question?
I have wondered why too. I'm not clever enough to know if that would affect the handling.
I have wondered why too. I'm not clever enough to know if that would affect the handling.
#66
01-10-2017, 07:18 PM
I would expect most members to have email subscriptions turned on automatically (the default) so the contributors to this thread will receive an email telling them there has been a new post on this topic. I believe that it what Cambo was referring to when he said they would have an interest in this thread.
#67
01-10-2017, 08:29 PM
Veteran Member
I'm sold on PSS since I've run them on other vehicles over the last few years and have seen the improvement they provide. I'm also sold on increasing the rear size to 305/30. Where I'm not certain how to proceed is on the front. Why do most of you that increase the tire size on the rear then leave it stock on the front? Why not go 265? Thanks.
Mods: not sure why you merged my thread with this one as I wasn't undecided on the size, I specifically was asking for close up pictures of 305/30/20 in the factory 10.5 inch wheel.
So now that its buried in the end of this thread, most probably its gonna be glossed over and ignored with no answer...
Thanks
So now that its buried in the end of this thread, most probably its gonna be glossed over and ignored with no answer...
Thanks
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#68
01-10-2017, 10:27 PM
Woa take it easy buddy... I was just asking a question, I never understood why people are so aggressive on forums, but whatever.
What I was saying is that my question was pretty specific, and I know/remember a bunch of members posting that they have 305 on 10.5 inch wheels. Once someone has them there is very little reason for them to inquire or go through every post of a thread such as this; but I guess none of that matters your highness.
What I was saying is that my question was pretty specific, and I know/remember a bunch of members posting that they have 305 on 10.5 inch wheels. Once someone has them there is very little reason for them to inquire or go through every post of a thread such as this; but I guess none of that matters your highness.
You're welcome.
#69
01-11-2017, 01:08 AM
to the guys running 305s on the stock 10.5 inch wheels, do any of you have close up pics of side and rear profiles?
I want to see how the sidewalls sits with 305 on 10.5. I usually don't do 305 on anything smaller than 11 inch, but am thinking about it as I'm due for tires...
Thanks
I want to see how the sidewalls sits with 305 on 10.5. I usually don't do 305 on anything smaller than 11 inch, but am thinking about it as I'm due for tires...
Thanks
Last edited by Cambo; 01-11-2017 at 01:43 AM. Reason: fix pics
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#70
01-11-2017, 07:26 AM
Veteran Member
#71
01-11-2017, 10:26 AM
Veteran Member
Well, you're not increasing the contact patch. You're just changing its shape. That's the misconception. Most people assume that when you add tire width wise, the tire touching the road length wise stays the same, but it actually decreases.
Since the tire is squished to create a contact patch, that contact patch is affected by the weight of the car. Since the weight of the car hasn't changed, and the pressure in the tire hasn't changed, the contact patch will be the same size because it is squishing the same amount due to the weight. The only way to increase contact patch size is to decrease tire pressure. And here is a handy-dandy calculator to help you maximize contact patch area/direction based on your needs:
BND TechSource - Tire Data Calculator
And also an article that maybe explains it better than I did:
The summary of all this is: Wider tires generally help lateral grip. Taller tires generally help reduce wheel spin (with lower air pressure to boot). And stickier tires help everything.
P.S. I'm the poor engineer fighting these battles.
Since the tire is squished to create a contact patch, that contact patch is affected by the weight of the car. Since the weight of the car hasn't changed, and the pressure in the tire hasn't changed, the contact patch will be the same size because it is squishing the same amount due to the weight. The only way to increase contact patch size is to decrease tire pressure. And here is a handy-dandy calculator to help you maximize contact patch area/direction based on your needs:
BND TechSource - Tire Data Calculator
And also an article that maybe explains it better than I did:
The summary of all this is: Wider tires generally help lateral grip. Taller tires generally help reduce wheel spin (with lower air pressure to boot). And stickier tires help everything.
P.S. I'm the poor engineer fighting these battles.
As far as F types go, I've got no reason to disbelieve that the reports from Ironmike and others that the 305 PSS offers superior traction to the OEM 295 P zeros.....and I'd guess that the extra width helps if the pressure is set properly. When my (sadly) new P Zeros are worn out, I will be going to the 305 PSS's based on the feedback from Unhinged, Ironmike and others.
2 cents,
Dave
#73
01-11-2017, 03:17 PM
Veteran Member
Not sure if this helps any of you guys but I always use this calculator for all my needs: Miata Tire Calculator | Online Miata Tire Calculator Tool
I wanted a plus 1 size for my 20's on my XE and there are none out there so I used this tool to find what works and I a mall set now.
My fronts were 235/35/20 and rears were 265/30/20 and were way too thin o the sidewall so I checked the tool and found that 245/35/20 fronts and 275/30/20 rears fit and are within 1% of each other so the AWD and ABS systems won't freak out.
Its so nice having more sidewall now and no side effects because the dealer said there were no options at all for my car in 20's. They were sure wrong.
I wanted a plus 1 size for my 20's on my XE and there are none out there so I used this tool to find what works and I a mall set now.
My fronts were 235/35/20 and rears were 265/30/20 and were way too thin o the sidewall so I checked the tool and found that 245/35/20 fronts and 275/30/20 rears fit and are within 1% of each other so the AWD and ABS systems won't freak out.
Its so nice having more sidewall now and no side effects because the dealer said there were no options at all for my car in 20's. They were sure wrong.
#75
01-13-2017, 04:49 PM
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Mpowerr (01-14-2017)
#76
01-13-2017, 05:10 PM
Senior Member
#77
01-13-2017, 05:43 PM
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#78
01-14-2017, 08:44 AM
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#79
01-14-2017, 11:29 AM
Veteran Member
I hereby vote Unhinged's car the nicest looking F type I've seen......plus it's likely the fastest V6 F type in existence and due to get even quicker! Well done! insert virtual bow here. :-)
Now get that P7 grill and surround installed and it will be about as good as it can get! (...I know, I'm procrastinating too! :-) )
Cheers,
Now get that P7 grill and surround installed and it will be about as good as it can get! (...I know, I'm procrastinating too! :-) )
Cheers,
Last edited by DPelletier; 01-14-2017 at 11:33 AM.
#80
01-14-2017, 12:49 PM
Veteran Member
I hereby vote Unhinged's car the nicest looking F type I've seen......plus it's likely the fastest V6 F type in existence and due to get even quicker! Well done! insert virtual bow here. :-)
Now get that P7 grill and surround installed and it will be about as good as it can get! (...I know, I'm procrastinating too! :-) )
Cheers,
Now get that P7 grill and surround installed and it will be about as good as it can get! (...I know, I'm procrastinating too! :-) )
Cheers,
I still need a solution for mounting the 2 inboard proximity sensors in the P7 grille. Somebody mentioned some BMW brackets that might work. Can anyone help?