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      03-29-2015, 03:16 AM   #45
johntomferg
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For stock M5 rims, give the Ferrari spec 295/35R20s I talked about earlier in the thread a shot.

I've been running them for 18k+ miles and they return the same aggressive overlap as the pictures shown in this thead by others as well as giving you more contact patch.

You can still pair them with a 275 up from if that is what you desire.
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      03-29-2015, 02:21 PM   #46
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Interesting... I've looked at the other pics but would really like seeing pics of your setup. What fronts are you running? Any issues with part throttle response?
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      03-29-2015, 02:41 PM   #47
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For better traction, tirerack recommends the Michelin sport cup 2....
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      03-29-2015, 02:46 PM   #48
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Yes I'm seriously considering sport cups. The size thing is less about traction (10mm more section width isn't much and doesn't always mean the same increase in tread width) and more about looks and a little more rubber to protect the rim against curb rash.
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      06-09-2015, 01:14 AM   #49
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I had stock rear 10" with 305/30/20. Tire bulge is significant, and I'd probably never curb my rims. =)

I think the tire almost looks flat..
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      06-09-2015, 05:31 AM   #50
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Quote:
Originally Posted by Charlie Brown
Thank you... I understand the "recommended" width. But if you look at the ratio of 295mm to 10" rim and 305mm to 10.5" rim and the actual fit of PSS on our stock rims, I don't see an issue with adding 10mm (5mm each side).

So again, if anyone who's actually done this would like to chime in. Please do. .
I've been running 305/30/20 PZero on stock 10" 343s for a month now...Michelin is out of stock...seems fine up till now...grip is good
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      06-11-2015, 08:59 AM   #51
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BBS CH-R 10" & 11"
wrapped on Vredestein "Ultrac" UltraContact R
265/35/20
305/30/20
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      06-16-2015, 09:49 AM   #52
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Quote:
Originally Posted by falsalem View Post
I've been running 305/30/20 PZero on stock 10" 343s for a month now...Michelin is out of stock...seems fine up till now...grip is good
+1
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      06-23-2015, 09:43 PM   #53
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Since I couldn't find a lot of pics from this angle, this is what a 305/30-20 P-Zero looks like on a stock 343M wheel. I prefer the look of the Michelins, but I wanted these to match my fronts, which have a fair amount of life left. The traction is an improvement. I did have 10mm spacers on the back, but there would definitely be fender contact, so I left them off and I don't think it needs it with these tires.
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      06-24-2015, 12:23 AM   #54
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Quote:
Originally Posted by MCarsFan View Post
+1
Probably fine unless you're running at a road course where you incur higher g-forces.
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      06-24-2015, 08:54 AM   #55
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I don't think it's an issue, the traction improvement is great.
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      06-26-2015, 07:16 AM   #56
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Has anyone got these tyres on the stock 343m rims?

305/30/20
275/35/20

stock or lowered setup?

Im thinking of trying this setup but I have spacers and lowered??
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      06-27-2015, 10:18 AM   #57
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I can say that the 305/30-20 on a rear 343m wheel is a tight fit with the fender at stock height and no spacer.
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      06-27-2015, 08:54 PM   #58
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Quote:
Originally Posted by Grumpywings View Post
I can say that the 305/30-20 on a rear 343m wheel is a tight fit with the fender at stock height and no spacer.
Fits great. 2500 miles on this set up
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      06-28-2015, 10:38 AM   #59
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Quote:
Originally Posted by MCarsFan
Quote:
Originally Posted by Grumpywings View Post
I can say that the 305/30-20 on a rear 343m wheel is a tight fit with the fender at stock height and no spacer.
Fits great. 2500 miles on this set up
@MCarsFan you're running 265 or 275 rubber on front wheels?
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      06-28-2015, 10:44 PM   #60
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Originally Posted by gmfive View Post
@MCarsFan you're running 265 or 275 rubber on front wheels?
Still 265s but I'll swap them up once I've worked through them to 275s. There is more understeer right now than I would care to admit but off the lights the wider rears have really helped the car..
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      06-28-2015, 10:58 PM   #61
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Quote:
Originally Posted by MCarsFan
Quote:
Originally Posted by gmfive View Post
@MCarsFan you're running 265 or 275 rubber on front wheels?
Still 265s but I'll swap them up once I've worked through them to 275s. There is more understeer right now than I would care to admit but off the lights the wider rears have really helped the car..
Thanks. Do you think the 275s will fit the stock 343M? I'll remove the spacers after I move to the fatter rubber. I'm using the beast as my DD now and burning rubber more quickly.
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      07-01-2015, 08:30 AM   #62
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+ 1 on this question. Going to the 305's for the same reason - tires go up in smoke with the MSR and DP's.

Quote:
Originally Posted by gmfive View Post
Thanks. Do you think the 275s will fit the stock 343M? I'll remove the spacers after I move to the fatter rubber. I'm using the beast as my DD now and burning rubber more quickly.
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      07-01-2015, 07:01 PM   #63
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I think it will be fine..but I haven't done the 275s yet..
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      08-04-2015, 03:23 PM   #64
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Considering 305s as well on stock rims. Currently have 12mm spacers - anybody have this set up with spacers? Or is is necessary to drop the spacers?
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      08-04-2015, 04:48 PM   #65
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Quote:
Originally Posted by gmfive View Post
Thanks. Do you think the 275s will fit the stock 343M? I'll remove the spacers after I move to the fatter rubber. I'm using the beast as my DD now and burning rubber more quickly.
275 fits but it makes your steering wheel heavier and slightly changes the camber
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      08-04-2015, 06:52 PM   #66
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Originally Posted by M6-Coupe View Post
275 fits but it makes your steering wheel heavier and slightly changes the camber
Thanks, then 265f/305r seems like a safer option even though 305s will also slightly modify handling characteristics of the car, right? I'll be doing it on the M5, stock 343M, not the M6 wheels.
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