Can I go 325/25/20 in the rear??? Would you?
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Drives Slowly
I won't be tracking the car but the PS4S 275/35/19 should fit the stock wheel without an issue.....hopefully.
My car has the stock suspension and I have no plans to install KW HAS or lowering springs.
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Joined: Oct 2008
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From: San Francisco
2016 AMG GT-S
Turns out my wheel manufacturer did not make my front wheels to spec and are having to remake them. They've made wheels for a handful of these cars and are unsure of what went wrong. So, for now I am running a lopsided car with stock wheels/tires up front and 325/25/21 in the rear and Renntech coils. Here are my first impressions:
Here are some pics of how she sits today. I know the springs will settle in a bit, causing the car to get even lower.
Does it have to do with the fact that there are 19's up front and 21's in the rear? Suspension too soft? Too low? Tires too wide? Can we roll the fenders? My mind is racing trying to figure out a way to make this work...
I think I will have it raised a bit and would love to hear if anyone has advice on how to reduce rubbing other than reducing tire size (that will be my last resort, after I finish these tires).
- I love the ride! It is way more supple than the KW sleeve kit that was apparently on the car (had no idea when I bought it). Comfort feels pretty darn comfortable now, and Sport+ feels like Comfort did on the KW's.
- Suspension in Comfort mode: I experience rubbing over larger bumps. There is a particularly horrendous road outside my tech's shop and I experienced a bone-shaking "THUD" over a couple major deformities. This honestly scared me a bit and I wondered if I had ruined the car with my choice of tire/suspension. Driving 45 miles of freeway back to San Francisco, I experienced 2 instances of rubbing - one over a dip while cornering at 7/10 into an off/onramp, and one other over a very large dip. Medium size dips seem fine, cornering on well paved roads doesn't seem to cause rubbing.
- Suspension in Sport+: there seems to be less chance of rubbing, but I tested over some metal plates in a construction area in SF and still experienced light rubbing in the rear
Here are some pics of how she sits today. I know the springs will settle in a bit, causing the car to get even lower.
Does it have to do with the fact that there are 19's up front and 21's in the rear? Suspension too soft? Too low? Tires too wide? Can we roll the fenders? My mind is racing trying to figure out a way to make this work...
I think I will have it raised a bit and would love to hear if anyone has advice on how to reduce rubbing other than reducing tire size (that will be my last resort, after I finish these tires).
Last edited by Hetzle; May 21, 2020 at 11:35 AM.
Member
Joined: Feb 2020
Posts: 151
Likes: 83
2016 AMG GTS
Turns out my wheel manufacturer did not make my front wheels to spec and are having to remake them. They've made wheels for a handful of these cars and are unsure of what went wrong. So, for now I am running a lopsided car with stock wheels/tires up front and 325/25/21 in the rear and Renntech coils. Here are my first impressions:
Here are some pics of how she sits today. I know the springs will settle in a bit, causing the car to get even lower.
Does it have to do with the fact that there are 19's up front and 21's in the rear? Suspension too soft? Too low? Tires too wide? Can we roll the fenders? My mind is racing trying to figure out a way to make this work...
I think I will have it raised a bit and would love to hear if anyone has advice on how to reduce rubbing other than reducing tire size (that will be my last resort, after I finish these tires).
- I love the ride! It is way more supple than the KW sleeve kit that was apparently on the car (had no idea when I bought it). Comfort feels pretty darn comfortable now, and Sport+ feels like Comfort did on the KW's.
- Suspension in Comfort mode: I experience rubbing over larger bumps. There is a particularly horrendous road outside my tech's shop and I experienced a bone-shaking "THUD" over a couple major deformities. This honestly scared me a bit and I wondered if I had ruined the car with my choice of tire/suspension. Driving 45 miles of freeway back to San Francisco, I experienced 2 instances of rubbing - one over a dip while cornering at 7/10 into an off/onramp, and one other over a very large dip. Medium size dips seem fine, cornering on well paved roads doesn't seem to cause rubbing.
- Suspension in Sport+: there seems to be less chance of rubbing, but I tested over some metal plates in a construction area in SF and still experienced light rubbing in the rear
Here are some pics of how she sits today. I know the springs will settle in a bit, causing the car to get even lower.
Does it have to do with the fact that there are 19's up front and 21's in the rear? Suspension too soft? Too low? Tires too wide? Can we roll the fenders? My mind is racing trying to figure out a way to make this work...
I think I will have it raised a bit and would love to hear if anyone has advice on how to reduce rubbing other than reducing tire size (that will be my last resort, after I finish these tires).
This product is used by virtually every sprint cup car to adjust the spring rate between tracks. If a racecar can use it, then I see no problem running it on my daily that gets some occasional high speed cornering.
Here is the product: http://www.longacreracing.com/produc...-Spring-Rubber
Here is the YouTube video walking through the install:
Here is a pic from mounting on my car yesterday:
I, too, was getting some rubbing over some medium to heavy bumps with my new wheel/tire setup and lowered on H&R. Now I really, really have to try to get it to rub over large bumps, dips at high speeds.
I was actually less worried about the rubbing before but more concerned that the H&R springs on both my factory and aftermarket wheels have the rear sitting about 5/8” lower than the front. I called H&R, and after looking at pics, they said this was normal. I think that’s ridiculous. Using the orange insert, it raised my rear about 3/8”. I’d consider using the red insert in the future to bring it perfectly level with the front.
Hope this helps. Worst case you’re out about $100, and you don’t like it. Best case, it’s a simple fix for $100.
Last edited by x96535; May 21, 2020 at 12:06 PM.
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Joined: Oct 2008
Posts: 152
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From: San Francisco
2016 AMG GT-S
I’m a little surprised you’re rubbing with that much gap. I’m guessing your spring rate has to be a lot less than the H&R’s that I’m running. There is an option to help raise it, though I’m sure some on here will scoff at it.
This product is used by virtually every sprint cup car to adjust the spring rate between tracks. If a racecar can use it, then I see no problem running it on my daily that gets some occasional high speed cornering.
Here is the product: http://www.longacreracing.com/produc...-Spring-Rubber
Here is the YouTube video walking through the install:
https://youtu.be/4UsGilmmhfI
Here is a pic from mounting on my car yesterday:
[REMOVED TO SAVE SPACE]
I, too, was getting some rubbing over some medium to heavy bumps with my new wheel/tire setup and lowered on H&R. Now I really, really have to try to get it to rub over large bumps, dips at high speeds.
I was actually less worried about the rubbing before but more concerned that the H&R springs on both my factory and aftermarket wheels have the rear sitting about 5/8” lower than the rear. I called H&R, and after looking at pics, they said this was normal. I think that’s ridiculous. Using the orange insert, it raised my rear about 3/8”. I’d consider using the red insert in the future to bring it perfectly level with the front.
Hope this helps. Worst case you’re out about $100, and you don’t like it. Best case, it’s a simple fix for $100.
This product is used by virtually every sprint cup car to adjust the spring rate between tracks. If a racecar can use it, then I see no problem running it on my daily that gets some occasional high speed cornering.
Here is the product: http://www.longacreracing.com/produc...-Spring-Rubber
Here is the YouTube video walking through the install:
https://youtu.be/4UsGilmmhfI
Here is a pic from mounting on my car yesterday:
[REMOVED TO SAVE SPACE]
I, too, was getting some rubbing over some medium to heavy bumps with my new wheel/tire setup and lowered on H&R. Now I really, really have to try to get it to rub over large bumps, dips at high speeds.
I was actually less worried about the rubbing before but more concerned that the H&R springs on both my factory and aftermarket wheels have the rear sitting about 5/8” lower than the rear. I called H&R, and after looking at pics, they said this was normal. I think that’s ridiculous. Using the orange insert, it raised my rear about 3/8”. I’d consider using the red insert in the future to bring it perfectly level with the front.
Hope this helps. Worst case you’re out about $100, and you don’t like it. Best case, it’s a simple fix for $100.
Also yeah I am very surprised about the rubbing given the gap too.
Last edited by Hetzle; May 21, 2020 at 12:07 PM.
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Joined: Feb 2020
Posts: 151
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2016 AMG GTS
Yeah, that was a typo. The natural stance for the H&R is to have the rear about 5/8” lower (per wheel gap - not fender to ground) than the front. I only did this on the rears. No rubbing on the fronts from what I can tell.
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Member
Joined: Oct 2008
Posts: 152
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From: San Francisco
2016 AMG GT-S
Gotcha, thanks a bunch! I think I'll order the red ones after the suspension settles in more.
Last edited by Hetzle; May 21, 2020 at 12:11 PM.
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On the large dips are springs bottoming? I would simply crank up 1/4- 1/3 inch all around. If I can ever get my car back into the shop I’m cranking it up a little less than a half an inch as the bottom of my car is scraping on severe angles as a result of RTECH springs settling.
if you keep getting the severe rub that you indicated, I would change tires out as it’s just not worth the chance you’ll damage the car.
if you keep getting the severe rub that you indicated, I would change tires out as it’s just not worth the chance you’ll damage the car.
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From: San Francisco
2016 AMG GT-S
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Joined: Oct 2008
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From: San Francisco
2016 AMG GT-S
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2016 AMG GTS
Right, but I'm guessing that's 3/4" in height uncompressed. I'd assume a stiffer material would compress less, therefore making the lift greater. I'll also try moving the orange ones to a different location within the spring - somewhere that the spring gap is normally less, to see if that helps raise it some more.
Member
Joined: Oct 2008
Posts: 152
Likes: 43
From: San Francisco
2016 AMG GT-S
Right, but I'm guessing that's 3/4" in height uncompressed. I'd assume a stiffer material would compress less, therefore making the lift greater. I'll also try moving the orange ones to a different location within the spring - somewhere that the spring gap is normally less, to see if that helps raise it some more.
Well the rear has settled in a bit more and is definitely still rubbing on medium sized bumps in Comfort - I'm pulling the trigger on those inserts.
Last edited by Hetzle; May 22, 2020 at 12:00 AM.
Member
Joined: Oct 2008
Posts: 152
Likes: 43
From: San Francisco
2016 AMG GT-S
On the large dips are springs bottoming? I would simply crank up 1/4- 1/3 inch all around. If I can ever get my car back into the shop I’m cranking it up a little less than a half an inch as the bottom of my car is scraping on severe angles as a result of RTECH springs settling.
if you keep getting the severe rub that you indicated, I would change tires out as it’s just not worth the chance you’ll damage the car.
if you keep getting the severe rub that you indicated, I would change tires out as it’s just not worth the chance you’ll damage the car.
On the plus side, the traction is amazing! I dead hook in 1st and 2nd for the first time ever and it feels THRILLING.
Last edited by Hetzle; May 22, 2020 at 12:08 AM.
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2016 AMG GTS
Forgot to mention, your car is killer! Can’t wait to see it with the full wheel setup. I watched a blue GTS with carbon ceramics sit on a dealer lot for about a month at a fantastic price before I was ready to move on it. Then it disappeared about two weeks before I was ready. Very jealous!
Member
Joined: Oct 2008
Posts: 152
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From: San Francisco
2016 AMG GT-S
Forgot to mention, your car is killer! Can’t wait to see it with the full wheel setup. I watched a blue GTS with carbon ceramics sit on a dealer lot for about a month at a fantastic price before I was ready to move on it. Then it disappeared about two weeks before I was ready. Very jealous!
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I went from 305/30/20s to 335/30/20s PSS on my GTC. They look awesome, especially since the 12" rims were under-tired with the 305s. They definitely reduce oversteer, especially if I am a little quick on the throttle out of a turn on track. I will switch to PS4S 325/30/20 when these are done.
Last edited by coconutpropane; Jan 9, 2025 at 01:56 AM.
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2019 AMG GT R
I would prob want to swap out the pilot sport cups too.
would anyone know whats the max width tyre a gtr can take in the front/back on oem rims without any rubbing? Thanks
would anyone know whats the max width tyre a gtr can take in the front/back on oem rims without any rubbing? Thanks
Last edited by untamedd; Jan 11, 2025 at 05:23 AM.
