305/25/20 PS2's on 10.5" Rear Wheels

MShao825 · 03-12-2010, 09:10 AM

I just bought a set of 20" BBS CH-R's and am curious about rear tire sizing. I'm dropped on Eibach springs and ordered 295/25/20 PS2 rear tires (10.5" rear wheels with 25mm offset I believe), but am wondering if a 305/25/20 PS2 rear tire size will rub or if it will somehow not be the most ideal. The fronts will be 245/30/20 PS2's. Believe it or not, Tire Rack actually suggests a 305/25/20 rear tire, and they're usually super conservative. Please share your thoughts as I'm a noob when it comes to this stuff

SpencerM3 · 03-12-2010, 11:26 AM

Seems like you'll have a lot of understeer on that set up. Also I would imagine that while driving on the hwy's and at fast speeds, if you hit a bump or groove in the hwy you'll probably get some rubbing on the back wheel wells, nothing too bad though.

Ca$hOnly · 03-12-2010, 11:29 AM

Quote:

Originally Posted by SpencerM3

Seems like you'll have a lot of understeer on that set up. Also I would imagine that while driving on the hwy's and at fast speeds, if you hit a bump or groove in the hwy you'll probably get some rubbing on the back wheel wells, nothing too bad though.

I don't think so. I run a similar setup and have no issues with "understeer" and no rubbing at all on 305/25/20's. My tires are Pirellis and the back is slammed on KW V3's. My wheel's offsets are +28, so just a tiny difference here. Unless the PS2's have a super beefy sidewall, you will not rub at all even with 4 people in your car.

SpencerM3 · 03-12-2010, 11:43 AM

Quote:

Originally Posted by Ca$hOnly

I don't think so. I run a similar setup and have no issues with "understeer" and no rubbing at all on 305/25/20's. My tires are Pirellis and the back is slammed on KW V3's. My wheel's offsets are +28, so just a tiny difference here. Unless the PS2's have a super beefy sidewall, you will not rub at all even with 4 people in your car.

Just seems like a big discrepancy from the front to rear tires. Only reason I said a bit of rubbing in the back is I am running 295/30/19’S in the rear with an Eibach drop and occasionally (though not at all lately), if I am going say 70mph or so on the freeway and I hit a dip, the tires do rub a but in the back. But honestly, it happened like 3 or 4 times when I first got them put on and it hasn’t happened much if at all lately.

Ca$hOnly · 03-12-2010, 12:57 PM

Quote:

Originally Posted by SpencerM3

Just seems like a big discrepancy from the front to rear tires. Only reason I said a bit of rubbing in the back is I am running 295/30/19’S in the rear with an Eibach drop and occasionally (though not at all lately), if I am going say 70mph or so on the freeway and I hit a dip, the tires do rub a but in the back. But honestly, it happened like 3 or 4 times when I first got them put on and it hasn’t happened much if at all lately.

Do you have PS2's? Maybe that's why.

MrHarris · 03-12-2010, 02:06 PM

PS2s you'll be golden, AD08's not so much. I rubbed w/ 295/30/19 10" +20 (good thing it was nothing major).

I got 245/295 combo, slightly less stagger than 245/305 but I don't notice any understeer but I do feel the steering is slightly more numb. I'll be going 255 in the front next.

kmac1980 · 03-12-2010, 06:40 PM

that setup would cause understeer as many people will suggest, but really, do you push your car with 20s on it to those limits often that you'd even experience understeer? Besides it's easy to create oversteer with the throttle

For the street I say go 305s!

MShao825 · 03-12-2010, 07:13 PM

Thanks for the replies fellas. Sounds look there's differing opinions across the board, which I expected. I was hoping someone had 305/25/20 PS2's on a 10.5" wheel who could chime in, but I guess no one is running such a setup. I'm definitely more worried about rubbing than the understeer, and I don't think anyone can say for sure whether they'll rub or not. Guess I'll just keep my 295/25/20 this time around.

SCtud · 03-12-2010, 08:09 PM

what are the specs on the front wheel that you're using?

Labrada_Exoticz · 03-13-2010, 01:01 AM

I donno about PS2's but I have 305s in the rear on pirelli pzero nero and I dont rub at all in the rear with H&R's. I think my rear offset is about +25

IE#02 · 03-22-2010, 05:35 AM

HI msha, just curious if you've fitted your CH-R's? How are they? I'm considering ordering a set myself. Any pics? thanks

MShao825 · 03-22-2010, 08:13 AM

Quote:

Originally Posted by IE#02

HI msha, just curious if you've fitted your CH-R's? How are they? I'm considering ordering a set myself. Any pics? thanks

I just put them on last night and think they look awesome

I went with the 245/30/20 front 295/25/20 rear setup that I had originally ordered, and I actually rub on really bad roads even with 295's in the rear, let alone 305's. With that being said, you may want to go with 285/30/20 in the rear. Below is a quick iPhone pic I snapped this morning (photoshoot coming soon

):

IE#02 · 03-22-2010, 05:51 PM

Nice..looks great! Thx for the tyre advice. I'll probably go for the satin black (on AW). cheers

03-12-2010, 09:10 AM	#1
MShao825 Go Terps! 53 Rep 1,375 Posts Drives: 2009 SSII/FR E92 M3 Join Date: Dec 2006 Location: Jersey City, NJ Gaithersburg, MD iTrader: (2)	305/25/20 PS2's on 10.5" Rear Wheels I just bought a set of 20" BBS CH-R's and am curious about rear tire sizing. I'm dropped on Eibach springs and ordered 295/25/20 PS2 rear tires (10.5" rear wheels with 25mm offset I believe), but am wondering if a 305/25/20 PS2 rear tire size will rub or if it will somehow not be the most ideal. The fronts will be 245/30/20 PS2's. Believe it or not, Tire Rack actually suggests a 305/25/20 rear tire, and they're usually super conservative. Please share your thoughts as I'm a noob when it comes to this stuff __________________
	Appreciate 0 Tweet Quote

03-12-2010, 11:26 AM	#2
SpencerM3 Sauce 75 Rep 2,023 Posts Drives: 2009 SSII E90 M3 Join Date: Jun 2006 Location: Los Angeles iTrader: (1)	Seems like you'll have a lot of understeer on that set up. Also I would imagine that while driving on the hwy's and at fast speeds, if you hit a bump or groove in the hwy you'll probably get some rubbing on the back wheel wells, nothing too bad though. __________________ 2009 E90 M3 \| Silverstone II \| Black Novillo \| HRE P40's \| Akrapovic Exhaust \| Eibach Pro Kit \| Jet Black Kidney Grilles \| SSII Side Reflectors \| SSII Side Gills \| LUX H8 Angel Eyes \| Macht Schnell Filter \| Tecnocraft Envy Charge Pipe "M3 drivers have no friends." - Jeremy Clarkson
	Appreciate 0 Quote

03-12-2010, 02:06 PM	#6
MrHarris yodog 197 Rep 5,026 Posts Drives: '86 Corolla Join Date: Jun 2007 Location: Diamond Bar, Ca iTrader: (5) Garage List 2009 BMW [10.00]	PS2s you'll be golden, AD08's not so much. I rubbed w/ 295/30/19 10" +20 (good thing it was nothing major). I got 245/295 combo, slightly less stagger than 245/305 but I don't notice any understeer but I do feel the steering is slightly more numb. I'll be going 255 in the front next. __________________ 2009 E92 M3 \| Alpine White \| Black Extended \| Advan RS \| Turner Test Pipes \| Dinan Axle-Back \| OETuning \| Eibach Springs \| UUC SSK \| VRS Front Lip \| VRS Type I Diffuser \| Matte Black \| RPi Scoops \| MS Filter \| Yokohama AD08 \| F1 Pinnacle Special Thanks: Gintani \| OETuning \| eAs
	Appreciate 0 Quote

03-12-2010, 06:40 PM	#7
kmac1980 Major 35 Rep 1,033 Posts Drives: '19 540xi Join Date: Jan 2006 Location: toronto iTrader: (1)	that setup would cause understeer as many people will suggest, but really, do you push your car with 20s on it to those limits often that you'd even experience understeer? Besides it's easy to create oversteer with the throttle For the street I say go 305s!
	Appreciate 0 Quote

03-12-2010, 07:13 PM	#8
MShao825 Go Terps! 53 Rep 1,375 Posts Drives: 2009 SSII/FR E92 M3 Join Date: Dec 2006 Location: Jersey City, NJ Gaithersburg, MD iTrader: (2)	Thanks for the replies fellas. Sounds look there's differing opinions across the board, which I expected. I was hoping someone had 305/25/20 PS2's on a 10.5" wheel who could chime in, but I guess no one is running such a setup. I'm definitely more worried about rubbing than the understeer, and I don't think anyone can say for sure whether they'll rub or not. Guess I'll just keep my 295/25/20 this time around. __________________
	Appreciate 0 Quote

03-12-2010, 08:09 PM	#9
SCtud First Lieutenant 20 Rep 329 Posts Drives: 2008 E93 M3 Join Date: May 2009 Location: CT iTrader: (1)	what are the specs on the front wheel that you're using?
	Appreciate 0 Quote

03-13-2010, 01:01 AM	#10
Labrada_Exoticz Subscribed 124 Rep 1,179 Posts Drives: F80 M3 Join Date: Feb 2008 Location: Miami iTrader: (4)	I donno about PS2's but I have 305s in the rear on pirelli pzero nero and I dont rub at all in the rear with H&R's. I think my rear offset is about +25
	Appreciate 0 Quote

03-22-2010, 05:35 AM	#11
IE#02 Private First Class 4 Rep 116 Posts Drives: e92 M3 / e46 M3 / R35 GTR Join Date: Mar 2010 Location: Oz iTrader: (0)	ch-r's HI msha, just curious if you've fitted your CH-R's? How are they? I'm considering ordering a set myself. Any pics? thanks
	Appreciate 0 Quote

03-22-2010, 05:51 PM	#13
IE#02 Private First Class 4 Rep 116 Posts Drives: e92 M3 / e46 M3 / R35 GTR Join Date: Mar 2010 Location: Oz iTrader: (0)	Nice..looks great! Thx for the tyre advice. I'll probably go for the satin black (on AW). cheers
	Appreciate 0 Quote

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search