• Protip: Profile posts are public! Use Conversations to message other members privately. Everyone can see the content of a profile post.

Wheel/Tire Input Needed

Joined
5 June 2002
Messages
238
Location
Seattle WA USA
Greetings , I will be purchasing some
new Racing Hart C2 series rims for my 91

Front 17x7.5 with 215/40/17 toyo proxy TS1
Rear 18x9.5 with 275/35/18 toyo proxy TS1

these tire sizes are recommended by the Rim manufacture , although in the forum somebody
suggested 255/35/18 for the rear ??

The offset is Plus39 for Front and Rear
Any TCS concerns (without sending me to some Tire chart)

Additionally I want no potential for Rubbing
are these tires to wide ? will lowering
with comptech springs help with this ? or is doing this simply for looks and or effects?

I would like to lower the car , The Acura
shop recommended the comptech springs over the eibach (misspelled ?) what do you think

so what has worked for you ?? any and all input is greatly appreciated..

Ken 91Red/Black
 
I know Comptech has Eibach make the springs for them according to their specs. On the comptech site it says that their springs lower an inch all around, whereas the eibach is 1.2 inches all around. I would think comptech is a better bet as far as rubbing issues are concerned. I rub with eibachs when I make a full lock turn, but only under compression and only on the driver side front. A stiffer spring will probably cure my rubbing problem. Comptech Springs are just that, they have springs that has a higher rate that are installed on the drivers side only. I think eibach has the same rate all around.
http://www.comptechusa.com/instructions/ins053.pdf
 
Ken,

I'm running some 17x7.5 and 18x9.5 Bridgestone Prodrive GC07c's with +44mm offset that I purchased from Chris at SoS.

Using 215/40/17 and 265/35/18 in the back, my car is a 97-T, and I don't have any problems with TCS.

BTW: How heavy are the C2s? Going from the OEM 15/16 to 17/18 on a 91 will have a bigger impact than going from 16/17 to 17/18 on 95+
cars... Just food for thought.

I hope that this helps.

2slow2speed
smile.gif
 
I'd highly recommend you go with 255/35/18. With 275/35/18 in the back, you'll get too much understeer, and the tire is at least an inch taller than stock, so your gearing will be hurt, it'll be heavier, and thus you'll probably notice a difference in accelleration. Not to mention potential traction control problems (although, that indeed may be why they recommended that size, since the front is .7" taller than 205/50/15).

I currently run 215/40/17 front and 255/35/18 rear, with +45mm front and +38mm rear, and have no rubbing problems. My car is also quite low (lower than most lowering springs, I'm pretty sure).

I always turn off my traction control, though (ALWAYS), so I can't comment on traction control issues.

My car is a 91, btw.

-Mike

[This message has been edited by grippgoat (edited 13 June 2002).]
 
Just a quick follow-up on the TCS question. On my way back from lunch, I forgot to turn off the TCS. While going around this one corner that I often go around, only not going around it nearly as fast as I could, I was pretty sure I felt the TCS kick in (that's why I noticed I hadn't turned it off). So while I think the 215/40/17 - 255/35/18 (or indeed 255/40/17) setup may not cause TCS problems in a straight-line, it may be more sensitive during agressive cornering. However, it's been so long since I drove on OEM-sized tires with TCS on that I can't really say for sure.

-Mike
 
Originally posted by grippgoat:
So while I think the 215/40/17 - 255/35/18 (or indeed 255/40/17) setup may not cause TCS problems in a straight-line, it may be more sensitive during agressive cornering.

Those sizes (with the 18" rear) are an increase in outer diameter of 3.04 percent front, 0.68 percent rear. The difference of roughly 2.4 percent should be reasonably okay. However, keep in mind that the difference between a new tire and one that's worn close to the tread indicator bars is around 2 percent. If the fronts have plenty of tread and the rears are worn, that could be just enough to cause the TCS to kick in due to the difference in outer diameter.
 
Originally posted by 2slow2speed:
Ken,

I'm running some 17x7.5 and 18x9.5 Bridgestone Prodrive GC07c's with +44mm offset that I purchased from Chris at SoS.

Using 215/40/17 and 265/35/18 in the back, my car is a 97-T, and I don't have any problems with TCS.

BTW: How heavy are the C2s? Going from the OEM 15/16 to 17/18 on a 91 will have a bigger impact than going from 16/17 to 17/18 on 95+
cars... Just food for thought.

I hope that this helps.

2slow2speed
smile.gif

Ken,

any chance I can take a look at the car/wheel? I want to see if it will clear my big brake kit.
 
My theory on the TCS engagement, is that the change in diameter ratio shifts the difference in rotation speed enough off-center of the stock brain's mapping, that the extra speed difference from cornering without the diff locked up throws it outside the window, when it wouldn't do that on the stock tires.

But I can't back that up. Maybe I should bolt on the stock wheels/tires for experimentation.

-Mike
 
Back
Top