TandR

Long time lurker, but I decided to join. Mostly because I figured this discovery needs to be known. I've read countless "Widest tire on stock wheels?" threads and all the posts of how a 305 "might fit" on a stock rear wheel. I read one thread about how it was confirmed by three different shops that a 305/35/19 on the stock wheels will definitely rub. Is there an abundance of RCF owners all buying 305/35 wide tires for the stock wheels? Probably not.
Well it looked to me like it would fit. I got it on a rack and took a ton of measurements before I actually bought these. Every possible angle that I measured showed that 305/35/19 in the rear SHOULD fit. Low and behold, my measurements were correct. Im lowered on Swift springs and currently running a 275/35/19 up front and a 305/35/19 in the rear on the stock wheels with with zero rubbing on the 305's, and I have TRIED to make them rub. From hard high speed corning to coming into the driveway a bit to fast lol. I just got back and had about 100lbs worth of stuff in the trunk, even some dips on the freeway, still, no rub. I can get the 275 to BARLEY rub, so minimal its not even worth fixing, though an alignment should remedy this. It rubs the rear portion of the fender liner but only under extreme braking. I'm talking only when to the floor braking and getting a full negative 1.0g. I have not got an alignment yet since lowered, but if I increase the positive caster just a little I am very confident that it should solve the issue. Some of you probably ask, why run a 35 series tire and risk it? Well I really love the Nitto NT-05 tire and the only size in a 19 that is a 305 is a 305/35. With a different set of wheels and the correct offset I don't see why someone couldn't fit a 325/30/19 and a 285/30 up front. It would be close, but I think there is enough room from the measurements I've taken. On a side note the only other things I have done is a 1" spacer between the axleback and midpipe (lets that 5 liter sing!) and I have chopped the secondary cats out (no I won't throw a check engine light, its the secondaries). I left the stock resonators so nothing but deep grumble, no raspy at all. Anyways, back on topic;


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johnnyreb

AWESOME, & Thanks for posting it cause I've also heard/read so many guys saying they WON'T Fit without rubbing! NOW I know, looks Great & WELCOME to the forum/club. Though, it'll still be interesting to see IF you have a few that will still come on here & say it's NOT a good idea to do it!

ISFPOWER

iTrader: (20)

i knew it would. thanks for reassuring everyone.

flowrider

iTrader: (9)

Yes, a 305/35/19 will fit a 10" wheel and a 275/35/19 will fit a 9" wheel per tire manufacturer's recommendations. The problem arises when you put a 30 series tire with those dimensions on stock RCF wheels.

Your wheel diameter is close to 1" more than stock, so your sitting close to ½" higher off the ground. Your speedometer is off. Don't know what affect this will have on the cars electrics

Lou

TandR

No lights, no anything. Car drives just as it stock....but with more traction . Stock the tires are 2.3% difference in size (255/35 & 275/35), now I'm at 3% difference (275/35 & 305/35). only .7% more. The 305/35 at "60 mph" is now 61.8mph. and the 275 up front at "60mph" is now 61.4mph. The difference is pretty negligible. At 1mph difference its not going to matter.
Concering height;
Front height has been raised by .3". Rear height has been raised by .4". With the swift springs I'm still quite lower then stock and I actually can enter my driveway not having to angle the car now, so thats nice lol.

CYKBC

iTrader: (2)

Listen to this guy.

lexusrus

Is the RCF electronic nanny monitoring all four tires and compare left to right sides at the same time PLUS another sensor monitoring the angle and rate of velocity changes? So the system knows and automatically compensate for any changes?

Davew77

It's not just about ride height, it's also about the forces involved. The tires are probably the heaviest part of the wheel and by increasing the diameter you are exponentially altering the forces. Going wider also has the same effect. Going wider and taller... It may be just fine. But I hear the VDIM is very sensitive. It's not normally advised to change the tire diameter by more than 2.5% from the stock diameter, at the maximum. Throwing around more force can adversely effect the suspension and braking systems as well.

I'm just sayin'... Maybe it's still within the needed tolerances, maybe not. I'm not the engineer who designed the system and I doubt Lexus will aid you in modifying their car.

Meraki Autoworks

iTrader: (8)

Nice, meaty tires!

-Josh

cosmo1

How much heavier are those wider tires than the oem's?

TandR

About 6lbs

ModInJapan

iTrader: (5)

With the extra weight of the tires, do you feel any loss of initial power at a launch situation?

IS_250

iTrader: (2)

Love the beefy rear tires. good job.

GetKinetic

following and would like to know more about your exhoust mods for a throatier sound

LRCSALES

iTrader: (1)

my thoughts exactly i researched the difference between the 305 and 295. looking at actual difference in tread width VS cost and weight i found it to not be worth it