Are ENKEI RAIJIN's 18x8 be compatible with GENERAL G-MAX RS 235/40ZR18 with the speedometer correct?

Sorry for the noob question, but I have never bought Aftermarket wheels before and wanted to upgrade to 18" wheels from the stock 16's on my LX Coupe. I was looking at Tire Rack, and like the look and price of the black Enkei Raijins 18x8" (40mm offset). I do want to keep the wheels flush with the body (no poke), and I also plan to lower the car (leaning towards the Skunk 2 springs) so I want to make sure I won't buy anything that will cause rubbing or any issues with the ride quality.

I want to keep my wheels/tires on the lighter side, and want good affordable performance summer tires to go on the Enkei's. Will General G-Max RS 235/40ZR18 fit the Enkei's? The page for the Enkei's mentions that 215/45-18 are the recommended size, so I wasn't sure if going with 235/40ZR18's would cause any problems.

Also most importantly, I want the speedometer to be accurate and want to confirm these wheels and tires will stay within the correct speedometer range.

Oh and one more thing I was confused about- do I need to get anything for the TPMS? I'm not sure how that works, but I am confused if I need to buy new TPMS sensors or move the TPMS sensors from the stock wheels to the new ones? Or just simply reset the TPMS?

Thanks a ton for any info in advance!

https://www.discounttire.com/learn/tire-size-calculator

This should help you figure it out, but typically if you're sticking with approximately the same diameter it'll be about the same speed. mines adjusted like .5mph if i go 18 from a 17.

Also for figuring out tire fit I just use tire-rack. It's 20x simpler

Wheel and tire size are fine, they are the same size as Si wheels except for offset (Si Wheel = +50mm).

At +40mm offset, you will far from flush but you will not have to worry about any rub.
Here are some rough numbers for flush fitment (w/o using stupid camber or stretched tires)
- 8 in = ~+30 mm
- 8.5 in = ~+35 mm
- 9 in = ~+40 mm
- 9.5 in = ~ +45 mm

I thought I was not rubbing using my Si wheels (w/ 235/40/18 tires) pushed out to +30mm offset, but I noticed tiny rub marks on the inside of the corner lights when I was washing the car.

If you add your make and model to Tirerack when selecting your wheels, they will not allow you to select wheel and tire combo that will rub.
Tires are a safety item and at the end of the day, tirerack does not want to be liable for selling you improperly fitting wheels and tires.

My favorite tire calculator is willtheyfit.com, it gives you a visual of your old wheel setup vs. your new one with poke, tire size, etc.

long_meats said:

Oh and one more thing I was confused about- do I need to get anything for the TPMS? I'm not sure how that works, but I am confused if I need to buy new TPMS sensors or move the TPMS sensors from the stock wheels to the new ones? Or just simply reset the TPMS?

Click to expand...

There are no pressure sensors in the wheels. It's an "Indirect" TPMS. The system reads the wheel speeds from the ABS sensors and figures out if one wheel is spinning faster than the others. If a tire starts going flat, it squishes more, which makes it roll as if it were smaller -- so it spins faster.

arsh88 said:

https://www.discounttire.com/learn/tire-size-calculator

This should help you figure it out, but typically if you're sticking with approximately the same diameter it'll be about the same speed. mines adjusted like .5mph if i go 18 from a 17.

Also for figuring out tire fit I just use tire-rack. It's 20x simpler

Click to expand...

Great, thanks for the input!

boibuddha said:

Wheel and tire size are fine, they are the same size as Si wheels except for offset (Si Wheel = +50mm).

At +40mm offset, you will far from flush but you will not have to worry about any rub.
Here are some rough numbers for flush fitment (w/o using stupid camber or stretched tires)
- 8 in = ~+30 mm
- 8.5 in = ~+35 mm
- 9 in = ~+40 mm
- 9.5 in = ~ +45 mm

I thought I was not rubbing using my Si wheels (w/ 235/40/18 tires) pushed out to +30mm offset, but I noticed tiny rub marks on the inside of the corner lights when I was washing the car.

If you add your make and model to Tirerack when selecting your wheels, they will not allow you to select wheel and tire combo that will rub.
Tires are a safety item and at the end of the day, tirerack does not want to be liable for selling you improperly fitting wheels and tires.

My favorite tire calculator is willtheyfit.com, it gives you a visual of your old wheel setup vs. your new one with poke, tire size, etc.

Click to expand...

Gotcha, I do plan on lowering it so basically I should be fine with that wheel/tire combination (though not flush as possible, which is less of a priority to me than not rubbing). Thanks for your detailed info!

BarracksSi said:

There are no pressure sensors in the wheels. It's an "Indirect" TPMS. The system reads the wheel speeds from the ABS sensors and figures out if one wheel is spinning faster than the others. If a tire starts going flat, it squishes more, which makes it roll as if it were smaller -- so it spins faster.

Click to expand...

Awesome, knowing that makes shopping for this stuff less complicated. Thanks!

boibuddha said:

Wheel and tire size are fine, they are the same size as Si wheels except for offset (Si Wheel = +50mm).

At +40mm offset, you will far from flush but you will not have to worry about any rub.
Here are some rough numbers for flush fitment (w/o using stupid camber or stretched tires)
- 8 in = ~+30 mm
- 8.5 in = ~+35 mm
- 9 in = ~+40 mm
- 9.5 in = ~ +45 mm

I thought I was not rubbing using my Si wheels (w/ 235/40/18 tires) pushed out to +30mm offset, but I noticed tiny rub marks on the inside of the corner lights when I was washing the car.

If you add your make and model to Tirerack when selecting your wheels, they will not allow you to select wheel and tire combo that will rub.
Tires are a safety item and at the end of the day, tirerack does not want to be liable for selling you improperly fitting wheels and tires.

My favorite tire calculator is willtheyfit.com, it gives you a visual of your old wheel setup vs. your new one with poke, tire size, etc.

Click to expand...

Tire rack confuses me since they only give me 215 45R18 as tires but i constantly see people running 225 40R18 and 235's. I'm assuming 215 is just the safe bet but it's still confusing that the site won't give any alternative sizes on their combos.

arsh88 said:

Tire rack confuses me since they only give me 215 45R18 as tires but i constantly see people running 225 40R18 and 235's. I'm assuming 215 is just the safe bet but it's still confusing that the site won't give any alternative sizes on their combos.

Click to expand...

That's tirerack being on the really safe side. I noticed that you get different tire sizes when swapping between models.

You get 215/45 for all models except Si and 235/40 for the Si, the tires have less than 1% difference in total diameter.

Go with the 215 if you want a more stretched look or the 235 if you want a meatier looking setup.

Again, the site willtheyfit.com is a great tool to compare your current setup vs your new setup.

I have the GMAX RS on a different car. Huge rim protector bead btw...which is nice to protect your rims. However they have a lot of void area in the tread pattern so overall grip is pretty low for the category of tire. Noticeably less than the Continental Extreme Contact Sport which was also night and day from the Bridgestone RE71R.

But to answer your question, depends on if you want MPG vs grip whether you go 215/45 or 235/40. Wider tire will prob cost you 2 mpg.

BarracksSi said:

There are no pressure sensors in the wheels. It's an "Indirect" TPMS. The system reads the wheel speeds from the ABS sensors and figures out if one wheel is spinning faster than the others. If a tire starts going flat, it squishes more, which makes it roll as if it were smaller -- so it spins faster.

Click to expand...

You're a savior my guy... Been searching everywhere for an answer to this, and it's been holding me back from going aftermarket wheels because I'm not knowledgable on TPMS systems. Thanks.

SandyEggoSi said:

I have the GMAX RS on a different car. Huge rim protector bead btw...which is nice to protect your rims. However they have a lot of void area in the tread pattern so overall grip is pretty low for the category of tire. Noticeably less than the Continental Extreme Contact Sport which was also night and day from the Bridgestone RE71R.

But to answer your question, depends on if you want MPG vs grip whether you go 215/45 or 235/40. Wider tire will prob cost you 2 mpg.

Click to expand...

SandyEggoSi said:

I have the GMAX RS on a different car. Huge rim protector bead btw...which is nice to protect your rims. However they have a lot of void area in the tread pattern so overall grip is pretty low for the category of tire. Noticeably less than the Continental Extreme Contact Sport which was also night and day from the Bridgestone RE71R.

But to answer your question, depends on if you want MPG vs grip whether you go 215/45 or 235/40. Wider tire will prob cost you 2 mpg.

Click to expand...

Hmmm, thanks for the heads up! I am looking for a notable improvement in traction over my stock Firestone FT140's. I have less than 15,000 miles on my car and the stock wheels slip ridiculously easily when taking off from a stop in my 2.0 CVT, and often makes screech-y noises when turning. So if there's better options, then I would love to hear them.

Also, do you mind clarifying which of those 2 tires you were referring to are better in terms of traction? I wasn't sure if you meant the Continentals had better traction or the Bridgestones. Based off what TireRack says, I'm guessing the Continentals (which are rated AA traction, vs just a single A for the Bridgestones) have the best traction/grip in your experience? They're 2 lbs less than the Bridgestones as well.

Thanks for the info!

long_meats said:

Hmmm, thanks for the heads up! I am looking for a notable improvement in traction over my stock Firestone FT140's. I have less than 15,000 miles on my car and the stock wheels slip ridiculously easily when taking off from a stop in my 2.0 CVT, and often makes screech-y noises when turning. So if there's better options, then I would love to hear them.

Also, do you mind clarifying which of those 2 tires you were referring to are better in terms of traction? I wasn't sure if you meant the Continentals had better traction or the Bridgestones. Based off what TireRack says, I'm guessing the Continentals (which are rated AA traction, vs just a single A for the Bridgestones) have the best traction/grip in your experience? They're 2 lbs less than the Bridgestones as well.

Thanks for the info!

Click to expand...

Bridgestone RE71R is the highest grip street tire you can buy, but they're incredibly noisy. I got 20k miles out of a pair, and got 25k out of the Continentals. Continentals if you want a quiet ride with reasonable grip, Bridgestone RE71R if you want MAX grip. Both are very grippy on wet pavement, but the RE71R can't evacuate water as well, so in standing water/puddles or heavier rain, go with the Continentals. Your call man. =)

FWIW, I've got another set of 18x9" with 245/40/18 RE71R's I'm about to throw on my 2017 Si. I have 18x9's on there with some Pirelli PZ4's which are more on par with the Extreme Contact Sports. Looking forward to the increase in grip.

SandyEggoSi said:

Bridgestone RE71R is the highest grip street tire you can buy, but they're incredibly noisy. I got 20k miles out of a pair, and got 25k out of the Continentals. Continentals if you want a quiet ride with reasonable grip, Bridgestone RE71R if you want MAX grip. Both are very grippy on wet pavement, but the RE71R can't evacuate water as well, so in standing water/puddles or heavier rain, go with the Continentals. Your call man. =)

FWIW, I've got another set of 18x9" with 245/40/18 RE71R's I'm about to throw on my 2017 Si. I have 18x9's on there with some Pirelli PZ4's which are more on par with the Extreme Contact Sports. Looking forward to the increase in grip.

Click to expand...

Hey thanks for the info! I think I'll be keeping an eye out for some new Continentals now for the reasons you listed, along with them being $45 less per tire. Hopefully Tire Rack or someplace will have them on sale at some point before the spring.

The higher model trip Civic Coupe/Sedan/Hatchbacks (especially with the 2019 models) use 18x8 +50mm offset wheels.
Stock tires for those are 235/40/18.
That should not be a problem on stock suspension, but I am not too sure if you plan to lower the vehicle.

I am planning to get some aftermarket wheels + tires for my Hatchback as well, and was able to get in touch with the parts guy at my local dealer. Mind you, this guy gets excited if you talk to him about aftermarket wheels (immediately starts off and asks what kind of fitment I want, if I'll be rolling my fenders, lowering the car, staggered set-up, etc). He tells memto not worry about voiding factory warranty hahaha

This is some of the info he gave me:

• +35 would be still considered flush.
• +40 ~ +45 would be like-stock flush.
• 18x8 or 18x8.5 would not be problem.
• 18x9 would work as well.
• Recommends 245 if going with 18x8.5, rather than the "stock" 235

Deciding between Enkei T6S or PF07 for myself at the moment...or white wheels to better match the body paint.