155 Wheel stud pattern - Alfa Romeo Forum
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155 Wheel stud pattern

Hello, can someone please tell me the EXACT wheel stud pattern dimmensions and offset.
Also, can anybody help with an electric window unit for the LEFT front door?


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Hi Oliver

this was posted by "TOAD" in Alfaowner.com

Some info I found that some of you might like
Here you can see a table with the original off-set sizes:

Giulia (4-d) 42 mm
Bertone (63-76) 38 mm
Spider (66-93) 38 mm
AR Berlina 38 mm
Montreal 25 mm
Alfasud Serie 1 45 mm
Alfasud Super 45 mm
Alfasud ti Ser2 39 mm
Alfasud Serie 3 39 mm
Sprint (Sud) 39 mm
Alfetta, all 45 mm
Giulietta, all 45 mm
Alfa 33, all 39 mm
Alfa 75 1.6-2.0 45 mm
Alfa 75 2.5 40 mm
Alfa 75 TS/Turb 30 mm
Alfa 75 3.0 30 mm
Alfa 90 2.0 45 mm
Alfa 90 2.5 40 mm
Alfa 145/146
1.4/1.6/1.7 16V 43 mm
Alfa 145/146
T. Spark/Q/ti 50 mm
Alfa 155, Serie 1
(first model) 50 mm
Alfa 155, Serie 2
(wide aches) 41 mm
Alfa 156 41 mm
Alfa 164 TS/V6 40 mm
Alfa 164 24V 32 mm
Alfa 166 41 mm
Alfetta GT/GTV 45 mm
GTV 2.0 45 mm
GTV6 2.5 40 mm
Spider T.S./V6 35 mm
Spider V6 24V 31 mm
GTV T. Spark 35 mm
GTV V6 24V 31 mm

But then there is the additional thing about bolt circle.

Old Alfas have 4x108 mm.
Alfasud/33/75/90/145/146 have 4x98 mm
Big engine (TS, Turbo, V6) 75/90 have 5x98 mm
147/156 have 5x98 mm
166 has 5x108 mm

The center hole has a diameter of 58,6 mm, but from the starting of the Fiat aera (1987) this size changed on new models to 58,1 mm.

If you find a new wheel which fits on a new Alfa, and you would like to use it on your Alfa 33, then you have to enlarge the center hole by 0,5 mm.

Hoping this will be to some help for you

cheers, wrinx [img]tongue.gif[/img]
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Remember 4x100 PCD wheels will fit with the right bolts (VW, BMW, Honda, Seat......)
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What sort of Bolts???
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The wheels I am using at the moment are standard 15" Alfa alloys. I don't know, but I think they are off something else as I believe 155 2.0s didn't have 15" as standard. I think, because mine came without climate air (my last one had it), it probably came with standard wheels and hubcaps. So, it is likely the bolts used are orgional.

Oliver [img]rolleyes.gif[/img]
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They are called Varibolts and have a movable collar on them that allows 1mm of variance per bolt to the PCD, so 2 make up the difference to 100 PCD.

OZ supply them with their wheels I think. Mine came from Ripspeed / Halfords with a set of Smiths wheels
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