Stuart Walker
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| posted on 14/8/04 at 02:03 PM |
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PCD and Offset
Hi,
Can anyone tell me whats the PCD and the offset for the wheels on a standard Locost? Also, what the hell do they mean?
Cheers!
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dave1888
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| posted on 14/8/04 at 02:17 PM |
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Im probably wrong but PCD is the distance between centres of the stud holes, Offset is the distance between the inside face (face that mates with hub)
and the inside edge of the wheel.
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liam.mccaffrey
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| posted on 14/8/04 at 04:14 PM |
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Pitch circle diameter
the wheel bolts lay on a circle called the pitch, whose diameter is the pitch circle diameter
the pcd diameter for most ford wheels or at least sierras and cortinas is 100 mm with 4 bolts- 4x100 PCD
[Edited on 14/8/04 by liam.mccaffrey]
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MikeRJ
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| posted on 14/8/04 at 04:42 PM |
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Offset is the distance between the center of the rim and the mounting face e.g. with zero offset the middle of the rim is exactly inline with the
drive flange. With larger offsets the wheel moves further inward.
Have a look at http://www.domsat.co.uk/pages/wheels.htm
[Edited on 14/8/04 by MikeRJ]
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Mix
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| posted on 14/8/04 at 05:03 PM |
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Hmm!!
Always thought the PCD was 108mm, could be wrong though.
Mick
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liam.mccaffrey
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| posted on 14/8/04 at 05:14 PM |
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i am sure its 100 for ford, i have daewoo wheels which are 108 and they are too big for my cortina uprights
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Lars
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| posted on 14/8/04 at 05:15 PM |
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i thought it was 108 for ford
doesn't matter though, just get my wheels of another 4 stud ford
[Edited on 14/8/04 by Lars]
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Mark Allanson
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| posted on 14/8/04 at 06:08 PM |
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As far as I know, Ford have never used 100mm PCD on anything, everything with 4 studs is 108mm
100mm is standard european, VW,Vaux (Opel), Renault etc
98mm is Italian
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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liam.mccaffrey
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| posted on 14/8/04 at 06:22 PM |
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mark you are absolutely correct i had my head ina muddle its my daewoo hubs that are 100 and all the ford stuff i have is 108
sorry guys
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craig1410
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| posted on 14/8/04 at 07:00 PM |
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Yes, I can confirm that Sierra's and Escorts (and probably most other 4 stud fords) are 108mm PCD. Several Peugeot cars also use this PCD but
have a slightly larger centre bore diameter (centre bore refers to the large hole where the hub nut is sometimes visible)
As for offset, the above description isn't quite accurate as the offset is actually the distance between the "centre" of the wheel
and the hub mounting surface, not the edge of the wheel. This can be either positive or negative.
There is a list of fitments and a very good description of offset on this website
Cheers,
Craig.
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Stuart Walker
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| posted on 14/8/04 at 07:08 PM |
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Ok think i get it now, cheers everyone!
quote:
Model: Fiesta, Ka, Puma, Escort, Orion, Focus, Sierra, Mondeo, Scorpio 94>
PCD: 4 x 108
Offset: 35...38
C/Bore: 63.3
So this means I cant fit my lovely offset 40mm rims doesnt it? 
Ah Well...
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Mark Allanson
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| posted on 14/8/04 at 07:45 PM |
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Saab 4 studs are also 108mm, not sure about the centre bore though
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Steve Hnz
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| posted on 14/8/04 at 11:45 PM |
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Stuart, maybe, maybe not. If when you mentioned standard locost you meant one with a Escort back axle then yes, with wheels having a large offset, you
run into clearance problems between the tyre & trailing arms. The book was written using escort wheels, about 126mm rim width, with 19mm offset,
which gives a backspace of approx 82mm. You mention a 40mm offset, what is your rim width? Its all dependant on that, but with a 152mm rim width(
6" ) and a 40mm offset. you get a 116mm backspace, so to maintain the same clearance you`d need an approx 35mm spacer. It has been done ,not
sure if I`d think it was desirable, others might have an opinion. HTH Steve. 
[Edited on 14/8/04 by Steve Hnz]
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Stuart Walker
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| posted on 15/8/04 at 12:04 AM |
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Aah I see!
So the ones I had seen at 16 x 7 are going to be far too big. I guess I'll just look for some once the car has arrived!
Cheers and thanks for all the info,
Stu
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