18x9.5 40mm offset on the front

[cntryman77]

Originally Posted by ihada69L78

I'm running 295-45-18"s.

on the fronts? those seem way wide

[Pro Stock John]

I have 265/50/18 Nittos up front, and 305/45/18 Nitto drag radials in back. Let me know if you need any special pictures.

FWIW, I didn't do these to save money, not that anyone asked, I really like how the OEM ZR1 wheels look as well as some of the GS wheels.

[ihada69L78]

295-45-18's are very close to 275-40-20, which a lot of guys run on the front. Helps get rid of understeer and you can rotate. I went with 18's because they are lighter and I think the extra tire sidewall looks better. JMHO

[cntryman77]

I'll definitely be staying with 18s & I plan on going the same size all the way around. I was planning on the 265/50/18 Nittos when I started looking at this. Now I'll have to consider the 295/45/18 Nittos too.

what are you 2 running...offset, spacers, lugs & what, if any, other mods did this require?

[Pro Stock John]

18x9.5 40mm front and back

Rears: E brake tied back, no other mods

Fronts: Have 5mm spacers up front, also ground down pad on the strut (pics on page 1, I maybe ground more than most folks need to). I don't have part number for my lugs, but they are the popular Gorilla ones. Also cut off wheels from brake pads, new aftermarket pads wouldn't have those weights.

cntry, one thing to keep in mind is your goal regarding tire height. I wanted to stay around stock height, not go shorter.

[SUX2BU]

I went shorter all the way around, lost more weight, helped the gearing, more responsive (had taller 18" tires at first but the car felt like an SUV).

I did 285/40 18 all the way around on 18x10, but they will fit 18x9.5 just fine.

[Retro69]

Originally Posted by SUX2BU

I went shorter all the way around, lost more weight, helped the gearing, more responsive (had taller 18" tires at first but the car felt like an SUV).

I did 285/40 18 all the way around on 18x10, but they will fit 18x9.5 just fine.

How far off is your speedometer with the shorter tires?

[Pro Stock John]

I've noticed as I've gone from my 20x9/275 combo to my 20x8/245/snows to these 18x9.5/265's, that the newest front combo feels the lightest.

[SUX2BU]

Originally Posted by Retro69

How far off is your speedometer with the shorter tires?

My car is tuned so I got it fixed, but it would only be off by about 6%. So when you are going 70 mph your speedo reads 74 mph.

[Retro69]

Originally Posted by SUX2BU

My car is tuned so I got it fixed, but it would only be off by about 6%. So when you are going 70 mph your speedo reads 74 mph.

Do they adjust this based on tire size?


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[cntryman77]

Originally Posted by Pro Stock John

18x9.5 40mm front and back

Rears: E brake tied back, no other mods

Fronts: Have 5mm spacers up front, also ground down pad on the strut (pics on page 1, I maybe ground more than most folks need to). I don't have part number for my lugs, but they are the popular Gorilla ones. Also cut off wheels from brake pads, new aftermarket pads wouldn't have those weights.

cntry, one thing to keep in mind is your goal regarding tire height. I wanted to stay around stock height, not go shorter.

I plan on keeping close to the stock height...I'm keeping my steelies & all seasons for winter...my car is a daily driver, so these are for the summer 3-4 months only

[Jason@JacFab]

285/40/18 all the way around on mine. I'd like to go to a 275/45/18, but they seem to be an oddball size and are very expensive from everything I've found so far. I'm running the .125" spacer shown above, that's just a hair over 3mm. Why run a thicker one if you don't have to?

Also, I did not have to move, or tie back my ebrake cable on the LS, plenty of clearance.

[SUX2BU]

Originally Posted by Retro69

Do they adjust this based on tire size?


Sent from my iPad using Tapatalk HD

Yes, rear tire diameter to be exact.

Originally Posted by RacnJsn95

285/40/18 all the way around on mine. I'd like to go to a 275/45/18, but they seem to be an oddball size and are very expensive from everything I've found so far. I'm running the .125" spacer shown above, that's just a hair over 3mm. Why run a thicker one if you don't have to?

Also, I did not have to move, or tie back my ebrake cable on the LS, plenty of clearance.

I know what you mean, my perfect tire size is 295/40 18 but only one company makes one tire in that size, Falken Azenis RT-615K. I had a pair on my 18x11s but they were a little stretched, they would fit PERFECT on my 18x10s all the way around. Bad side is that they are very soft and don't have much tread depth, they are more of a track tire.

[Pro Stock John]

I like the look of the ZR1 style wheels: