boca928s

my 1985 with factory 16" wheels...wheels look to be the same front and rear... I wanted to know correct tire sizes... My rear tires look so thin... not sure if I can get wider tires? or maybe spacer can be used? the tires I have are..225/50zr16 on all 4 corners.
thanks

Babado

Noobie,here, my 1986.5 is in for much maintence and I'm going with stock 225/50x16 Conti Extreme Sport's, my reasoning is, I think the Porsche engineer's knew what they were doing, I'm not messing with spacers, I'm sure wider tires will look better in the back though.

leperboy

225/50/16 is correct for 16x7 wheels. You should have 21mm spaces for the rear that push the wheels out to fill the wells.

You can go to 245/45/16 in the rear if you have the wider (8") manhole wheels from an 87 or later car.

Matt

ramcram

I have owned 3, 86.5 Australian delivered 928s and all were fitted with 21mm rear spacers from the factory.
M415 - Widening of the Gauge on the Track of Rear Axle (21mm spacers, extended wheel studs)

leperboy

I had suggested 25 mm above, but I think you are right at 21mm, not 25mm as i said.

Matt

Babado

I may have spacers but the manholes are 7" all the way around, I stand corrected I must have spacers because my window stickers does say " Widening of the Gauge on the Track of Rear Axle " standard no option.

leperboy

7" is what they came with in 85. In 87 they increased the rears to 8", but those will fit the 85 if you can find them. I ran them for quite a while with no issues, as have others.

Darklands

245/45R16 is very rare from the premium tire manufacturers. I think Pirelli has one for 350-400 $ each.

https://www.tirerack.com/tires/TireS...45&diameter=16

WALTSTAR

I have a set of staggered manholes with unworn but old bf Goodrich g-force tires that I could let go for a reasonable price, if interested.

IcemanG17

Starting in USA 1987 & ROW 1987 all 928's were staggered wheels through the end of production. 16x7 front and 16x8 rear..however the 16" tires are becoming harder to find so upgrading to a 17" or even 18" wheel improves looks and handling for a minimal investment. With the right offsets you can run significantly larger tires all around easy. I ran the Porsche Cup 3's from 2006 base 911's that are quite popular..... 235/40-18 front and 265 up to 285 rear fit easy. On my race car I ran standard Porsche rear wheels of 18x10x65mm all around with 275/35-18's with fender rolling to fit....but thats a bit much front tire for a street car