Wider tires 305 25 20 on stock 343 rears?

soooma · 08-03-2014, 09:21 PM

Any experience ?
Is it doable?
Any risks?
Is it worth it?
Speedo error?

Or should be
305 30 20?

Fantasm · 08-03-2014, 09:41 PM

305/30/20 works perfectly fine. im running nitto nt05's in that size right now. i have a whole lot better traction but thats due to the tire change too, not just the width increase.

M5TXGuy · 08-03-2014, 09:56 PM

Quote:

Originally Posted by Fantasm

305/30/20 works perfectly fine.

Im about ready for new rear tires and was thinking of going to 305s as well. If I make the switch, would I need to take the 10mm spacers out?

Fantasm · 08-03-2014, 10:14 PM

Nothing needed -- no rubbing at all even during power slides and very aggressive cornering.
I believe the NT05's I'm running are even a bit thicker than the Michelin PSS too, and I'm running them at 38psi cold (which is more than stock PSI).

Fantasm · 08-03-2014, 10:19 PM

Quote:

Originally Posted by M5TXGuy

Im about ready for new rear tires and was thinking of going to 305s as well. If I make the switch, would I need to take the 10mm spacers out?

Sorry, I read your question wrong, I thought you asked if you would need to add 10mm spacer.

I don't think you would need to remove it, but I am not totally sure - looks like it will be fine though.
Either way, if you do have to remove it, it doesn't sound like a bad thing since you are getting the natural width extension from the tire without the spacer being required.

PatrickC23 · 08-04-2014, 06:09 AM

Can you run 305 rears with either 265 or 275 fronts? Is either preferred since my fronts probably will jot need replacing at the same time.

JOHNBMWM5 · 08-04-2014, 07:12 AM

Quote:

Originally Posted by PatrickC23

Can you run 305 rears with either 265 or 275 fronts? Is either preferred since my fronts probably will jot need replacing at the same time.

I would not "Mix axles" tyre wise, but it's up to you, check for "insurance issues" should an accident occur.

Fantasm · 08-04-2014, 11:02 AM

Quote:

Originally Posted by JOHNBMWM5

I would not "Mix axles" tyre wise, but it's up to you, check for "insurance issues" should an accident occur.

What do you mean by mix axles? I don't think he meant he wants to run 265 on left and 275 on right. He said either or.

JOHNBMWM5 · 08-04-2014, 11:40 AM

Quote:

Originally Posted by Fantasm

What do you mean by mix axles? I don't think he meant he wants to run 265 on left and 275 on right. He said either or.

I mean one type of front tyre and another type on the rear axle.
Is he buying all 4 tyres or just two?.

M6-Coupe · 08-04-2014, 11:59 AM

Quote:

Originally Posted by soooma

Any experience ?
Is it doable?
Any risks?
Is it worth it?
Speedo error?

Or should be
305 30 20?

The total diameter for 295/30/20 is 26.968"
The total diameter for 305/25/20 is 26.003"
so you will expect about 3.5% speedo error means when your speedo shows 100 mph, your actual speed is 96.5 mph if there is no other built-in speedo error which there is (your speedo always shows a bit more than actual speed)

The total diameter for 305/30/20 is 27.204"
In this case your speedo has less than 1% error and shows 1% less than actual speed,
If I were you, I would go with 305/30/20 and I don't see any issue since I have seen M5 with 433M wheel which is 1/2" wider than M5 343M

PatrickC23 · 08-05-2014, 11:12 AM

Quote:

Originally Posted by JOHNBMWM5

I mean one type of front tyre and another type on the rear axle.
Is he buying all 4 tyres or just two?.

I meant when my rears go - Id get 305 in the rear with my oem fronts, but Id get PSS all around. Didnt know if 265f and 305r would cause any difference.

mcvaughan · 08-05-2014, 11:38 AM

Quote:

Originally Posted by PatrickC23

Quote:

Originally Posted by JOHNBMWM5

I mean one type of front tyre and another type on the rear axle.
Is he buying all 4 tyres or just two?.

I meant when my rears go - Id get 305 in the rear with my oem fronts, but Id get PSS all around. Didnt know if 265f and 305r would cause any difference.

More under steer.

stealth.pilot · 08-05-2014, 03:13 PM

Quote:

Originally Posted by mcvaughan

More under steer.

Exactly which is why you want to increase size of both front and rear. I would do 305 rears and 275 fronts, and use same wall as OEM tires. PSS is available in that configuration.

HXS · 08-05-2014, 03:44 PM

Unfortunately, minimum recommended wheel width for 305's is 10.5.

M6-Coupe · 08-05-2014, 04:16 PM

Quote:

Originally Posted by HXS

Unfortunately, minimum recommended wheel width for 305's is 10.5.

I'm not sure if this is correct ???? I found some links 10" should be fine!
http://mostwheels.com/rimwidth.html

HXS · 08-06-2014, 01:55 AM

Quote:

Originally Posted by M6-Coupe

I'm not sure if this is correct ???? I found some links 10" should be fine!
http://mostwheels.com/rimwidth.html

Click here, then click "Specs".

Rim width range: 10.5-11.5

08-03-2014, 09:21 PM	#1
soooma ///MD 1377 Rep 3,998 Posts Drives: M5 F90 Join Date: Apr 2013 Location: NC iTrader: (1)	Wider tires 305 25 20 on stock 343 rears? Any experience ? Is it doable? Any risks? Is it worth it? Speedo error? Or should be 305 30 20? __________________ Life is too short even if you live to be a 100!! As what really counts is the few moments we are really happy and excited! -Kids, Family, Success, Career, Helping others stand on their feet (Paying back and sometimes forward), Travel, Seeking the truth, Reading, Hobbies eg ///Madness -
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08-03-2014, 09:41 PM	#2
Fantasm Lieutenant 39 Rep 475 Posts Drives: SL63 Join Date: Mar 2009 Location: Orange County, CA iTrader: (2)	305/30/20 works perfectly fine. im running nitto nt05's in that size right now. i have a whole lot better traction but thats due to the tire change too, not just the width increase. __________________ NOW: 2011 Ferrari 458, 2014 BMW M5 w/ CompPack, 2014 BMW X1, 2005 BMW M3 with Gintani SC&Meth, 2008 Ducati 1098 BEFORE: 24+ Other Awesome Cars - BYE - My Straight Piped Ferrari 458 (plus other mods): http://goo.gl/2qf5fW
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08-03-2014, 10:14 PM	#4
Fantasm Lieutenant 39 Rep 475 Posts Drives: SL63 Join Date: Mar 2009 Location: Orange County, CA iTrader: (2)	Nothing needed -- no rubbing at all even during power slides and very aggressive cornering. I believe the NT05's I'm running are even a bit thicker than the Michelin PSS too, and I'm running them at 38psi cold (which is more than stock PSI). __________________ NOW: 2011 Ferrari 458, 2014 BMW M5 w/ CompPack, 2014 BMW X1, 2005 BMW M3 with Gintani SC&Meth, 2008 Ducati 1098 BEFORE: 24+ Other Awesome Cars - BYE - My Straight Piped Ferrari 458 (plus other mods): http://goo.gl/2qf5fW
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08-04-2014, 06:09 AM	#6
PatrickC23 Colonel 183 Rep 2,245 Posts Drives: '16 991.1 911 GTS, '16 F85 X5M Join Date: Apr 2012 Location: NNJ iTrader: (0) Garage List 2013 BMW ///M5 [0.00]	Can you run 305 rears with either 265 or 275 fronts? Is either preferred since my fronts probably will jot need replacing at the same time.
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08-05-2014, 03:44 PM	#14
HXS Licensed Drug Dealer 741 Rep 2,269 Posts Drives: F10 M5 Join Date: Oct 2010 Location: SoCal iTrader: (7)	Unfortunately, minimum recommended wheel width for 305's is 10.5.
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