IcemanG17

When I was at Gregs shop is LA over Xmas I saw Joe Fans race car up on the rack...it was still setup for the ITE race at Laguna....which means it had 335/30-18 RA1's all the way around!!!!!!!!!!!!!!!!!!!!!! Damm those are some meats on the front!! The front and rear rims were different...the fronts were a much higher offset than the rears....but they both looked brand new...custom forgelines no less!!

mark kibort

I dont think it will matter much . the rear still will be 3" wider ,and thats the main factor, not so much what tire size is up front. Anderson runs (and so does fan) the same size on all 4 corners usually.

the 315, 335 or 305 all feel prett close to the same with the 275 up front. the front still has a tendancy to push, so im thinking a larger tire up front will help.
MK

largecar379

pictures would be nice.....didn't you get some while you were there for reference?

--Russ

largecar379

Just a thought on this madness----

you could do this:

run the same tire/wheels I run on the rear of mine--315/25/19 on 19x11 et67mm for the front (probably nowhere near enough offset, but.....

and then run the same thing on the rear with a 21mm spacer.

I really haven't a dog in this hunt, but if the wheel tracks were greater in the rear than the front, it might work for you. the tire/wheel package would be "square", but the wider track in the back might limit "push"?

I'm really betting the front offset (on my example) is not enough......read where somebody went to a 10 inch front wheel but the offset was about 88mm....?

Anyhow, you would have a larger tire contact patch, shorter sidewalls (limiting flexing) and possibly lighter tire/wheel package.......


As I said, I probably have no idea what I'm talking about.....(I did say that didn't I?)

--Russ

mark kibort

Actually, both rims as i have them set up now are pushing the limits of the fenders. 8" backspacing front and rear on 9.5 and 11" rims. The key point here is that im still 75" width in the rear and 71.5" in the front. That will stay relatively constant, even if you put a big front tire up front . what anderson and fan do is use this same size and offset rear rim. (actually, just a little less backspacing) and then use a wider spacer in the rear and no spacer in the front. this allows for the same type of width difference , front to rear, and the rims and tires could be use either front to rear.

I think you are right about the offset up front with a 10" rim. and even with the proper offset, the rim will be way out if it is anything less than 7.5" backspacing. (thats what i have now on my second set of kinesis)

How would that wheel tire combo weigh less? its going to weigh more because the larger tire is heavier (more rubber) the rim 10-11" rim is near the same weight, right aroun 19-20lbs.

mk

largecar379

Mark--

Car:

1980 Euro with complete '89 S4 front suspension/brakes. 8mm spacer on the front. Suspension is not settled. Pictures below.

I put my 315's (315x25x19 on 19x11 et67mm) on the left front just for mock up.

I checked the tire clearances and this is what I found:

far right turn--tire hits front inner fender panel (the one that bolts on in the fender) just before steering lock. You could remove the panel if need be.

far left turn--tire hits the sway arm (stock 928 sway arm). Does not hit the rear inner fender panel.

tire sticks out beyond the fender by about 1.5 inches (you can see this in the pics)


it can be done, but you'd have to do something about fender extensions(wheel opening flares).


as for weight reduction, I was implying that the tire weights may be less due to the 19's as opposed to 17 or 18's (less sidewall height).


hope this is instructive, educational......crazy to think of doing, etc----

--Russ

mark kibort

25s???? why do you even need any air???

It does look pretty "out there". definitely need some big flares, or keep the ride hight near stock and the suspension stiff.

I have to do some calculations to see what the et67mm equals as far as backspacing . If i remember correctly, i dont think its too far off the 11" 8 inch backspacing rear rims of mine.

Mk