275 tires and 18x11 vs 18x10 wheel fitment on stock shocks

[razorlab]

I'm not necessarily asking about stiffness, though I understand that the eibach is one of the stiffer ones available, more so the adjustability. Karcepts bar has me spoiled on the S2000.

Most of the bars for the Supra are adjustable, sans some like the Cusco. Not like the Karcepts though. Probably be a nightmare to package something like that into the Supra.

One thing to note is that it's a tight fit with the bigger bars and the LCA. Some cut the last adjuster hole to clear. Less so with OEM LCA (although you still need to check clearance with full steering sweeps), and more so with aftermarker LCA's.

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[Gabe]

This conversation comes at a great moment when I committed with a second set of wheels that will be the Titan7 TR-10s that are 18X10.7" +38MM. Squared set. (I got at a good discount and Apex is on back order everywhere)
I am lowered on MSS adjustable springs and I am trying to find out if 275/35 vs 295/35 will give me a better fit on that wider 10.7 wheel.
The 275 gives me a lot of breathing room on my lowered car, but I’m worried that the tire stretches out too much on the wheel.
The 295/35 is a great fit for that wheel but I’m concerned it will be rubbing all over inside the fender.

thoughts?

 

[razorlab]

This conversation comes at a great moment when I committed with a second set of wheels that will be the Titan7 TR-10s that are 18X10.7" +38MM. Squared set. (I got at a good discount and Apex is on back order everywhere)
I am lowered on MSS adjustable springs and I am trying to find out if 275/35 vs 295/35 will give me a better fit on that wider 10.7 wheel.
The 275 gives me a lot of breathing room on my lowered car, but I’m worried that the tire stretches out too much on the wheel.
The 295/35 is a great fit for that wheel but I’m concerned it will be rubbing all over inside the fender.

thoughts?

I’ve run 18x11 +40 with 295/35/18 and -3.8 to -4.0 camber and had no issues with rubbing. This is inset more than the setup you are referencing. Tire to strut I don’t know because I never ran OEM struts with non OEM wheels/tires.

 

[FLtrackdays]

This conversation comes at a great moment when I committed with a second set of wheels that will be the Titan7 TR-10s that are 18X10.7" +38MM. Squared set. (I got at a good discount and Apex is on back order everywhere)
I am lowered on MSS adjustable springs and I am trying to find out if 275/35 vs 295/35 will give me a better fit on that wider 10.7 wheel.
The 275 gives me a lot of breathing room on my lowered car, but I’m worried that the tire stretches out too much on the wheel.
The 295/35 is a great fit for that wheel but I’m concerned it will be rubbing all over inside the fender.

thoughts?

I think others have mentioned before, it’s better to stretch than be too tight. Not that you’d do either on those. Just sayin… you could go either way and make it work. There are variations between tires of the same size. Once you get the setup where you like, you’ll want to stick to the same one, even the brand. 275/35 has worked well for me.

 

[Gabe]

I think others have mentioned before, it’s better to stretch than be too tight. Not that you’d do either on those. Just sayin… you could go either way and make it work. There are variations between tires of the same size. Once you get the setup where you like, you’ll want to stick to the same one, even the brand. 275/35 has worked well for me.

Thanks. You are on Apex 18 /10 squared. Right?

I am afraid to stretch the 275/35 too much on the 10.7 titan and lose too much shoulder due to stretch. I was looking at this reference table and it seems to be kind of ok.
I’m also looking into getting the coilovers and the links+ camber plates I’ve had in a box for almost a year to get more camber

 

[Rensuhlo]

Thanks. You are on Apex 18 /10 squared. Right?

I am afraid to stretch the 275/35 too much on the 10.7 titan and lose too much shoulder due to stretch. I was looking at this reference table and it seems to be kind of ok.
I’m also looking into getting the coilovers and the links+ camber plates I’ve had in a box for almost a year to get more camber

Here is a 275 CRS and 71RS on the same exact spec titan wheels you ordered, peep the fitment. This isn't brain surgery, just get the 275 and enjoy your track weekends.

 

[razorlab]

Not sure what you mean by “lose the shoulder”? It will still be there, and be much mightier with some stretch versus pinched.

You could also do a 295/30/18 on the 10.7

Car will be lower and your splitter will work better. Downside is ground clearance.

 

[Shift9303]

Here is a 275 CRS and 71RS on the same exact spec titan wheels you ordered, peep the fitment. This isn't brain surgery, just get the 275 and enjoy your track weekends.

Speak of the devil, that looks like stock height and I'm planning on running 275/40/18 CRS too, at least starting off. How much spacer was needed in these pics? Any rubbing on the setup pictured here?


I'm also finding that Apex is back ordered to hell so I've been looking at T7s as well. I don't have too much against T7. I've run both on my S2000. Though I do prefer Apex as the paint app is better IMO.



For what it's worth I'm aware that CRS and A052 run stupid wide. I've found plenty of pics of their 275s on 11s and they don't look stretched at all. But in person I've also seen V730 and RT615k in 275/35/18 on T7 10.7s and they definitely look stretched. More than I'd like and I run a 17x10 and 255 hot boi setup on my S2000.

 

[Gabe]

Not sure what you mean by “lose the shoulder”? It will still be there, and be much mightier with some stretch versus pinched.

You could also do a 295/30/18 on the 10.7

Car will be lower and your splitter will work better. Downside is ground clearance.

Ok. Damn. Thanks.

Speak of the devil, that looks like stock height and I'm planning on running 275/40/18 CRS too, at least starting off. How much spacer was needed in these pics? Any rubbing on the setup pictured here?


I'm also finding that Apex is back ordered to hell so I've been looking at T7s as well. I don't have too much against T7. I've run both on my S2000. Though I do prefer Apex as the paint app is better IMO.



For what it's worth I'm aware that CRS and A052 run stupid wide. I've found plenty of pics of their 275s on 11s and they don't look stretched at all. But in person I've also seen V730 and RT615k in 275/35/18 on T7 10.7s and they definitely look stretched. More than I'd like and I run a 17x10 and 255 hot boi setup on my S2000.

well…
I took the plunge and went with the V730s 275/35 R18 squared on Titan 7s which are 10.7 inch wide.

I also put an order for the coilovers and I have camber plates and end links in a box somewhere. So I will be busy mounting those up and will let you know.

 

[razorlab]

Ok. Damn. Thanks.

well…
I took the plunge and went with the V730s 275/35 R18 squared on Titan 7s which are 10.7 inch wide.

I also put an order for the coilovers and I have camber plates and end links in a box somewhere. So I will be busy mounting those up and will let you know.

That size V730 will be great on the 10.7 as the Kumhos don't run wide and they have stiff sidewalls.

 

[Shift9303]

So I went with HKS sleeves as a stop gap measure because I didn't want to go to coilovers so early when I don't have that much seat time yet.

However I'm at my wits end. I can not get the god damn spring perch off of the oem shock for the life of me. I'm hitting it with a 4 lb dead blow and it won't move at all. Any body got any tips? I'm almost tempted to cut them off at this point.

At least I got to test out some wheel fitment before putting it on stands. 15/18mm spacers:

 

[rwense]

So I went with HKS sleeves as a stop gap measure because I didn't want to go to coilovers so early when I don't have that much seat time yet.

However I'm at my wits end. I can not get the god damn spring perch off of the oem shock for the life of me. I'm hitting it with a 4 lb dead blow and it won't move at all. Any body got any tips? I'm almost tempted to cut them off at this point.

At least I got to test out some wheel fitment before putting it on stands. 15/18mm spacers:

Hmm, im pretty certain I used a 4lb deadblow when I installed mine too lol. As much as id like to give a secret trick, I think I just beat the piss out of it

 

[rwense]

I've had some conversations about the 275/35/18 vs 295/35/18 vs 305/30/19 71RS and the general consensus is the 295/35/18 seems to put power down the best by far. The 275/35/18's I used had trouble in 3rd gear corners (Pitt Race T5 and T17), but the 295/35/18 would hold fine on another tuned Supra at the same event also in 3rd gear. We assumed it had something to do with sidewall compliance.

-2 rear camber and .2 degrees toe in per side on mine. I would chalk the rotation/wheel spin I had at CMP to the tires being mostly done at that point. I did try manually shifting and it would hold fine in higher gears, but if left in auto where it chose a better gear it would easily over power the grip out back.

Interestingly, the stock Michelin PSS put power down better at CMS than the 71RS did mid corner. I'm trying the 275/40/18 Yok for fun next at VIR and expect it will work better. I'm going to try upping the rear camber a bit after the test with the Yoks if they exhibit the same behavior.

I'm not expecting the ability to floor it everywhere, but I do expect it to not light up the rear as easily as it did on the 275/35 setup. The staggered setup is a good test for that, and I hope to test back to back early next year before any TA competitions.

Oh hey a fellow Pitt Race enjoyer. That was my home track until last year (RIP). Turn 5 can definitely be hard to put power down. With my setup (275/40 CRS on an 18x10.7 titan7, stock power, FA510s) I can pretty consistently mash the throttle and climb out of the Gulch. That is until maybe 4 or 5 events in. Then I have to juuuuust a tiny bit but then get back in it.

 

[Shift9303]

Hmm, im pretty certain I used a 4lb deadblow when I installed mine too lol. As much as id like to give a secret trick, I think I just beat the piss out of it

I'm waiting for a knuckle spreader tool so I can take the shock out of the knuckle and get better access to the perch. If that doesn't work I'm just going to take it to a shop to have it pressed out. Unfortunately this delay and my work schedule may push back the start of my season. Oh well, guess I can always run the car with oem stagger for 1 event worse comes to worst.

 

[tracer bullet]

However I'm at my wits end. I can not get the god damn spring perch off of the oem shock for the life of me. I'm hitting it with a 4 lb dead blow and it won't move at all. Any body got any tips? I'm almost tempted to cut them off at this point.

Just to be sure, you're going "up", right? Maybe try hammering a little bit all around and not just one side in case it's rocking sideways a bit and catching. Or try prying against one of the little brackets that are welded on (but don't go so hard you pry them off instead)

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