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      12-22-2020, 07:18 AM   #1
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Largest tire sizes on stock rims

I have searched a bit in the forum to see what kind of setup people prefer. I daily drive my M2C, but will definitely track it as much as my budget allows. What is the widest you can go in front and rear? How much of a stagger do you keep, +1 or +2? Or have you gone with a square setup? If so, what do you do about the different rim sizes, do you go with 4 rear rims? Any info on handling dynamics with each setup is greatly appreciated!
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      12-22-2020, 10:21 AM   #2
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Quote:
Originally Posted by kiosko View Post
I have searched a bit in the forum to see what kind of setup people prefer. I daily drive my M2C, but will definitely track it as much as my budget allows. What is the widest you can go in front and rear? How much of a stagger do you keep, +1 or +2? Or have you gone with a square setup? If so, what do you do about the different rim sizes, do you go with 4 rear rims? Any info on handling dynamics with each setup is greatly appreciated!
Usually best to stick with the original stagger ratio of +2 size. Widest I would go on stock wheels and stock suspension setup is one size up wider. Limited benefit, if any, from going much wider than that.

For me, 255/35 and 275/35 is about right. You'll find lots of discussion on this in the tire/wheel forum section.
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      12-22-2020, 12:20 PM   #3
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Beware of going wider up front. I went +1 up front and I have rubbing at full turn, others are reporting rubbing even with the same size, but different tire. In the rear you have more room, and +1 should be fine (mine is perfect at +1), others have reported +2 without issues. I would suggest you go to the M2 wheel/tire forum for more data points
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      12-22-2020, 12:32 PM   #4
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running 255/275 on stocks.
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      12-22-2020, 03:55 PM   #5
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265/285 if you have camber and also willing to massage the fender liner a bit.
255/275 if you have everything stock.
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      12-22-2020, 06:14 PM   #6
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Quote:
Originally Posted by 2PUTT View Post
running 255/275 on stocks.
2putt. If I recall correctly you have the sottozeros on. You have no rubbing on the front at slow speed full turns?
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      12-23-2020, 07:58 AM   #7
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Thank you guys. Sounds like 255 is max up front and 285 is max in rear. I think I would keep the +2 difference and go with 275 in the rear. Thanks again!
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      12-23-2020, 11:01 AM   #8
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Quote:
Originally Posted by BigKutta View Post
2putt. If I recall correctly you have the sottozeros on. You have no rubbing on the front at slow speed full turns?
correct. no rubbing.
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      12-23-2020, 11:10 AM   #9
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Can anyone chime in on the pro's/con's between 255/275 and 255/285? I'm in the same boat for research as it's getting closer to needing new new tires and this isn't something I'm all that smart about. (The rears keep spinning and spinning and SPINNING with the Carbahn tune!)

Last edited by flybigjet; 12-23-2020 at 12:17 PM..
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      12-23-2020, 12:29 PM   #10
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Quote:
Originally Posted by flybigjet View Post
Can anyone chime in on the pro's/con's between 255/275 and 255/285? I'm in the same boat for research as it's getting closer to needing new new tires and this isn't something I'm all that smart about. (The rears keep spinning and spinning and SPINNING with the Carbahn tune!)
255/285 will make the car understeer more. If you don't corner that often and like doing straight pulls, 285 in the back is no problem.
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      12-23-2020, 12:57 PM   #11
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Quote:
Originally Posted by Fabb View Post
255/285 will make the car understeer more. If you don't corner that often and like doing straight pulls, 285 in the back is no problem.
Oh, I *definitely* enjoy the cornering buffoonery inherent in the M2C. If I just wanted to do straight pulls, a Tesla 3P would've been in the garage instead.

(and my buddy, who's a Tesla Zombie) would have lost his mind.)
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      12-23-2020, 02:10 PM   #12
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do a search.... 265/30f, 285/30r is the best setup, BUT, i'm currently running 275/30f + 295/30r on stock suspension and it's a close 2nd. No rubbing nor camber needed on stock suspension
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      12-27-2020, 11:50 AM   #13
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Quote:
Originally Posted by ssabripo View Post
do a search.... 265/30f, 285/30r is the best setup, BUT, i'm currently running 275/30f + 295/30r on stock suspension and it's a close 2nd. No rubbing nor camber needed on stock suspension
I'm pretty sold on the PS4S as a tire, so that puts the 285/30 out of contention.

I think you're running the 275/295 combination on stock wheels? Aren't the wheels a bit too narrow for that? (I'm not good at wheel/tires, so I'm asking to learn). I believe the stocks are 9/10" wide F/R, and that combination wants at least a half inch larger?

Also, how would you compare the ride, visual appeal, and performance between the stock wheels/suspension on 245/265 compared to the 275/295? I've seen a few of your pictures here on other threads, but I can't really tell much by looking on my laptop.

My largest problem is that the Carbahn tune is just too powerful for the rears-- it's causing irritating slippage at WOT-- all the way through (at least) third gear. I'm trying to mitigate that somewhat and have been studying tire/wheel combinations until my head's about to explode-- and since the Minister of War and Finance is getting..... testy about my vehicle expenditures, I need to get things right the first time.

THANKS!

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      12-29-2020, 01:19 PM   #14
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Quote:
Originally Posted by flybigjet View Post
I'm pretty sold on the PS4S as a tire, so that puts the 285/30 out of contention.

I think you're running the 275/295 combination on stock wheels? Aren't the wheels a bit too narrow for that? (I'm not good at wheel/tires, so I'm asking to learn). I believe the stocks are 9/10" wide F/R, and that combination wants at least a half inch larger?

Also, how would you compare the ride, visual appeal, and performance between the stock wheels/suspension on 245/265 compared to the 275/295? I've seen a few of your pictures here on other threads, but I can't really tell much by looking on my laptop.

My largest problem is that the Carbahn tune is just too powerful for the rears-- it's causing irritating slippage at WOT-- all the way through (at least) third gear. I'm trying to mitigate that somewhat and have been studying tire/wheel combinations until my head's about to explode-- and since the Minister of War and Finance is getting..... testy about my vehicle expenditures, I need to get things right the first time.

THANKS!

R.
No problems at all with stock wheels... do a search, all the above questions (with pics) were answered.
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      12-29-2020, 01:59 PM   #15
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Quote:
Originally Posted by ssabripo View Post
No problems at all with stock wheels... do a search, all the above questions (with pics) were answered.
Searching has pretty much all I've been doing on my downtime lately (much to my wife's exasperation)-- but there's a fair bit of contradictory information on the forum. Additionally, a lot of it is for the M2 instead of the M2C, which makes things even more fun.

Your posts, along with paradocs98, JCZ5 and @S.111 have been very helpful, but I admit to getting a little confused by all the data.

Today? I'm sort of leaning with just going with the 255/275 on stock wheels and maybe not even messing with the suspension. Yesterday? It was full-on 9.5/10.5 wheels w/ a full suspension upgrade. It changes day to day, depending on how frustrated I get.

And honestly? I'm trying to love the Apex EC-7's, but I'm not sure I can get there. I really love the look of the 763M's, but a) not at their current price, b) not with widths the same as the stock 788M's, and for sure as hell not in black or gold. And it would be worth my life to get a set and have them refinished-- the Minister of War and Finance would lose her mind at that point.

I like the look of the Apex ARC-8's but they're not going to be offered in an M2C fitment due to the spoke/brake clearance. Apex is working on a SM-10 for the M2C, but I'm not loving that design either.

But, oh for a 763M replica in an 8.5/9.5 in Anthracite!

I'm going to call my contact at Carbahn next week after New Years Day and see what he recommends in regards to getting power to the ground and messing with the M2C suspension. Maybe the answer's as simple as slightly larger rubber in a better compound. That would be easy and a LOT cheaper.

R.
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      12-31-2020, 06:40 AM   #16
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Running 255/275/35 RE71Rs with 10mm spacers on stock 437's and I get some rubbing front and rear. 20mm lowered with 2.2* and 1.7* camber.

Need to investigate massaging the liners as the RE's are quite square unlike the MPSS etc
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      12-31-2020, 03:31 PM   #17
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I run 265/30 & 295/35's PS4's. The rears rub under full compression but I'll go with the 295/30's next time....

Zero problems up front with the 30 AR.
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      01-04-2021, 08:12 AM   #18
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Quote:
Originally Posted by flybigjet View Post

But, oh for a 763M replica in an 8.5/9.5 in Anthracite!

R.
The replica's are available in 'Satin Gun Metal' over here in the UK, in those sizes, so maybe in the US too.
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      01-04-2021, 12:22 PM   #19
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Quote:
Originally Posted by ssabripo View Post
do a search.... 265/30f, 285/30r is the best setup, BUT, i'm currently running 275/30f + 295/30r on stock suspension and it's a close 2nd. No rubbing nor camber needed on stock suspension
Thanks to everyone, I know there are countless threads on the subject, but they are a pain to figure out, especially if the suspension is stock.

I was leaning to 285/30, but noticed in the calculator that the diameter is quite a bit smaller than stock. A 295/30 is closer to the stock diameter/circumference. I'm a bit worried about the 275/30 upfront since it does not rub on yours, but it might on someone else's as claimed by others in the forum. I also want to stay +2 on the stagger and not try 265/295 alternative since I think it will increase the understeer.

I live close by you in Weston and work in Pompano, any chance we can meet up one of these nights or a weekend during the day to check out your car and get some track insights from you? I just came back from Sebring and although it was a fun car to track, it could use some more rubber to keep it planted in the turns!
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      02-03-2021, 10:31 AM   #20
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Curious to follow this as well as for my CS I want to do a similar thing and won't deal with any rubbing or suspension changes past potentially camber plates either.
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      02-03-2021, 10:50 AM   #21
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Quote:
Originally Posted by kiosko View Post
I was leaning to 285/30, but noticed in the calculator that the diameter is quite a bit smaller than stock. A 295/30 is closer to the stock diameter/circumference.
The 285/30 is a bit shorter, but it should be, it's matched with the 265/30.

The problem with the 285/30 is tire availability. Dinan got around this by using the Corsa, but most guys will want the PS4S, which is made in 285/30, but not available in the USA yet (and maybe never).
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      02-03-2021, 05:29 PM   #22
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Quote:
Originally Posted by VisualEcho View Post
The 285/30 is a bit shorter, but it should be, it's matched with the 265/30.

The problem with the 285/30 is tire availability. Dinan got around this by using the Corsa, but most guys will want the PS4S, which is made in 285/30, but not available in the USA yet (and maybe never).
the indy f1 500 is available in 265/30f and 285/30r

i'm changing the fronts to 265/30 P4S next month, and will report back on the impacts with a 295/30r, but I do think it will end up working pretty well for the P4S (compared to 275/30f)
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