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Largest spacer on ARP 1” Extended

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466
440
Exp. Type
HPDE
Exp. Level
Under 3 Years
MD
does anybody have any experience fitting a 28mm spacer on the 1“ ARP studs? Using with 18x11 wheels. I know 25 is the go to but I have stock struts still and plan to run 315/30 so I’ll take all the clearance I can get safely. Thanks for any input.
 
466
440
Exp. Type
HPDE
Exp. Level
Under 3 Years
MD
Thanks for the replies guys.

I had a lapse and forgot I actually have a 3mm on my rear wheels. I will just add it to the 25 that I have and see how much thread is left. Will take a picture to confirm if it is doable.
 

Bill Pemberton

0ld Ford Automotive Racing Terror
8,425
8,356
Exp. Type
Time Attack
Exp. Level
20+ Years
Blair, Nebraska
Switching tires to Toyo RRs and they are supposedly a bit narrower than the BFG gforce R1Ss ( no longer made I the 315 size ) which slightly rubbed the struts. The issue is some 315s will likely fit with no rubbing and others might with a 25mm. Would think a 28mm would fit on the ARP studs and interesting to see the note listed by AZ Boss ----no wonder he has won the ST2 Championship with the NASA Region he competes in.
 
466
440
Exp. Type
HPDE
Exp. Level
Under 3 Years
MD
How did this turn out?
I wasn’t confortable with the lack of threads. Some may say it was okay but I just rather run a 28mm on longer studs like OP’s GT4 studs.
I tried to capture the difference between the two. Please excuse the poor picture quality
28mm
86ABCE68-AFF2-413D-8250-BF9A7D23AB60.jpeg
25mm
3F052F2D-7881-4EE2-9417-FFC7804C5B50.jpeg
 
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