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#1 S2 upright on a S1
Posted: Sun Dec 07, 2025 6:06 pm
by 40GT
Are there any differences that would make fitting S2 uprights to a S1 car difficult, ie does any geometry change, steering track contact, ball joints etc.
The reason I ask is I have quite a few Girling 18/4, 16/4 calipers along with various AR/BR and CR too, the problem is all these calipers have a 3.5 inch mounts, non have 3 inch as the S1.
Just putting the question out there so I can decide whether to just buy new S1 Zues and be done.
Cheers, Sean.
#2 Re: S2 upright on a S1
Posted: Sun Dec 07, 2025 7:30 pm
by angelw
Hello Sean,
No problem whatsoever.
Regards,
Bill
#3 Re: S2 upright on a S1
Posted: Sun Dec 07, 2025 8:17 pm
by mgcjag
If uprating the front then you need to think about the rear.
Steve
#4 Re: S2 upright on a S1
Posted: Sun Dec 07, 2025 10:21 pm
by 40GT
Thanks Bill, yes Steve the previous owner had put S2 calipers on the rear, whether these will pair with 18/4's I need to look into.
#5 Re: S2 upright on a S1
Posted: Mon Dec 08, 2025 2:27 am
by angelw
Hello Sean,
One thing I forgot to mention, is that you will probably have to change the position of the mount brackets that are spot welded to the Rotor backing panels, but that isn't a big job.
Regards.
Bill
#6 Re: S2 upright on a S1
Posted: Mon Dec 08, 2025 6:48 pm
by Series1 Stu
Would Sean need to fit flat hub wheels if he changes the uprights, discs and calipers for Series 2 parts?
Regards
#7 Re: S2 upright on a S1
Posted: Tue Dec 09, 2025 7:49 am
by chrisfell
“Would Sean need to fit flat hub wheels if he changes the uprights, discs and calipers for Series 2 parts?”
No.
My S1 has S2 uprights. No idea when they were acquired. Before my stewardship of the car.