Anyone fit a 225x50r15 R compound in the front?

[mopwer]

I have a set of 222 Kumho V710s and I'm wondering if I can run these all around. I believe the Hoosiers and other R compounds run wide just like these. If you have got some to fit, what size/offset wheels? Thanks.

Greg

[kbrew8991]

some guys over on mr2oc have done it... offset/spacer required seemed to depend on your camber setting

[NONACK]

They will physically fit on the stock wheels, although the fronts will look a little pinched. They should clear , but you may have to go with a .25 inch spacer if you run a buttload of camber.

[mopwer]

Originally Posted by NONACK

They will physically fit on the stock wheels, although the fronts will look a little pinched. They should clear , but you may have to go with a .25 inch spacer if you run a buttload of camber.

If I go to 225s in the front, I'll be using new wheels all around - 15x7 or 8 (if they work). I'd like to be able to rotate them around based on wear and the course.

Greg

[NONACK]

Oh. I was thinking the stock 15's front and rear. I think you could fit the 15x7 with factory or slightly more offset, but I have no idea about the 15x8.

[mopwer]

Originally Posted by NONACK

Oh. I was thinking the stock 15's front and rear. I think you could fit the 15x7 with factory or slightly more offset, but I have no idea about the 15x8.

I think factory offset on a 7" would put the front rim too close to the strut can. I tried putting the stocker 7" from the rear on the front. I may have one of my tires mounted and try it again.

I'm also thinking 8s would be too wide for the front. May have to stick to the 7". I found someone with 8s that I can try. We'll see. Just wanted to know if anyone had actually done it already to save me the headache of trying different things.

Greg

[nwautoxer]

I run this size on 6" front wheels for E Stock autocross with 10mm spacers and long wheel studs. Have also used 205s on the front and there are some trade-offs: I think the 205s are more precise and I can use -2.5 degrees or more camber. The 225s are limited to about -2 degrees camber or they rub on the strut housings, but they generate as much or more cornering force. The -2 degrees gives less tire wear on street tires going back and forth to events (most of my events are 70 to 130 miles from home).

[mopwer]

Originally Posted by nwautoxer

I run this size on 6" front wheels for E Stock autocross with 10mm spacers and long wheel studs. Have also used 205s on the front and there are some trade-offs: I think the 205s are more precise and I can use -2.5 degrees or more camber. The 225s are limited to about -2 degrees camber or they rub on the strut housings, but they generate as much or more cornering force. The -2 degrees gives less tire wear on street tires going back and forth to events (most of my events are 70 to 130 miles from home).

Good info. I'm running SM2 and using adjustable camber plates in the front, so I can run about -3 deg front camber at the track. Do you think that is too much for the 225's? When corning at speed (autocross speed, that is) I get more oversteer, but at slower speeds on tight corners, it will push the front end.

Greg

[nwautoxer]

I don't think its too much for autocross, although I haven't actually driven at -3'. Without camber plates and with crash bolts I have had close to -2.75' and liked it better than the -2' setting.

[kbrew8991]

I'm at -3.1* with crash bolts on mine, actually underprepared for ES (stock front bar).

the only time I get push is on street tires (sometimes) if I'm too abrupt with my turn-in. If you're patient and let the car gradually roll they're fine, but if you jerk the wheel at all they slide and don't roll to generate the grip

no idea what it'll do with even so much as a bigger front swaybar though

[ixtlann]

keep in mind ur changing the shape of the contact patch, not size or area. Popular misconception.

[kbrew8991]

Originally Posted by ixtlann

keep in mind ur changing the shape of the contact patch, not size or area. Popular misconception.

if the entire tire is touching, the 3.0* range is getting up there

[mopwer]

Originally Posted by ixtlann

keep in mind ur changing the shape of the contact patch, not size or area. Popular misconception.

Interesting point. So it sounds like the race setting is the best bet.

Greg

[mopwer]

Well I finally got around to actually measuring the camber on my car. The front on the street setting it is -1.5* and only -2* on the track setting. Rear is 1.8-1.9* all the time. So it looks like I could add some crash bolts and bring the street setting in some more, maybe to -2*. Looks like I have a lot more toe out with the camber plates in the track position too. I can actually see it! Will this be ok on a big track or is it going to be twitchy?

Greg

[kbrew8991]

I'd be wary of going too far with toe out, tire wear + overly abrupt turn-in FTL

[mopwer]

Originally Posted by kbrew8991

I'd be wary of going too far with toe out, tire wear + overly abrupt turn-in FTL

Gotcha, I'll reserve that setting for the AutoX track. Thanks.

Greg