S2 upright on a S1

Technical advice Q&A

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40GT
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#1 S2 upright on a S1

Post by 40GT » Sun Dec 07, 2025 6:06 pm

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.
Sean

S1 2+2 1966 BW RHD
XK120 1954 comp LHD

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angelw
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#2 Re: S2 upright on a S1

Post by angelw » Sun Dec 07, 2025 7:30 pm

Hello Sean,
No problem whatsoever.
Regards,
Bill

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mgcjag
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#3 Re: S2 upright on a S1

Post by mgcjag » Sun Dec 07, 2025 8:17 pm

If uprating the front then you need to think about the rear.
Steve
Steve
69 S2 2+2 (sold) ..Realm C type replica, 1960 xk150fhc

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40GT
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#4 Re: S2 upright on a S1

Post by 40GT » Sun Dec 07, 2025 10:21 pm

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.
Sean

S1 2+2 1966 BW RHD
XK120 1954 comp LHD

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angelw
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#5 Re: S2 upright on a S1

Post by angelw » Mon Dec 08, 2025 2:27 am

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
Last edited by angelw on Tue Dec 09, 2025 7:55 am, edited 1 time in total.

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Series1 Stu
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#6 Re: S2 upright on a S1

Post by Series1 Stu » Mon Dec 08, 2025 6:48 pm

Would Sean need to fit flat hub wheels if he changes the uprights, discs and calipers for Series 2 parts?

Regards
Stuart

If you can't make it work, make it complicated!

'62 FHC - Nearing completion
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chrisfell
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#7 Re: S2 upright on a S1

Post by chrisfell » Tue Dec 09, 2025 7:49 am

“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.
Chris '67 S1 2+2

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