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  1. #1
    Join Date
    Jul 2018
    Location
    france
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    49
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    65

    XJ6 front & rear disc bolt pattern

    Hi everyone, i'am searching with no success the front and rear bolt pattern of xj6 discs to do my homework and machine my 7075 HAT, if someone has this info it will be very helpfull

  2. #2
    Join Date
    May 2004
    Location
    Finchampstead, Berkshire, UK.
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    56
    Posts
    3,842
    PCD:*5x120.65*(5x4.75)

  3. #3
    Join Date
    Jul 2018
    Location
    france
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    49
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    65
    Quote Originally Posted by Happy Jim View Post
    PCD:*5x120.65*(5x4.75)

    Thanks for the fast response. I think this pcd is the one of the wheel studs. What i am looking for is the pcd of the disc fixations on the axle (5 bolts fronts, 4 on the rear on the IRS side that seems to be on a rectangular pattern).

  4. #4
    Join Date
    Jul 2012
    Location
    NW England
    Posts
    756
    Can’t give you exact figures but can (more or less) guarantee that the front disk mount PCD is not the same as the wheel mount PCD.
    i made sure me spacers for my discs and they don’t fit the wheels.
    They didn’t fit on my Mercedes wheels but can’t remember what that is. I’ll try and get a measurement tomorrow.

  5. #5
    Join Date
    Dec 2002
    Location
    Carpark of Unearthly Delights (Sussex Division)
    Posts
    677
    I understand and you'd have to confirm a 121.20002 front disc has the following spec

    (from a manufacturer's drawing of unknown origin)

    Outer dia:284.0mm
    Height:60.5mm
    Nom thick:24.2
    Min thick:22.9
    Hub reg:82.6mm
    Bolt size:11.5mm
    Bolt PCD: 5x111.12 mm
    Weight 15.97 lbs

    Hopefully get you pointed in the right direction
    Richard

    "We're going to need bigger brakes"

  6. #6
    Join Date
    Jul 2018
    Location
    france
    Age
    49
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    65
    Thanks you give right info as measures from number 1 to 2 or 1 to 3 bolts confirm your numbers. I assume pcd is on a 4.375" pattern.

    For the rear i ve done search on spicer parts but for now not found right u-joint flange. My measures are 61.3mm and 73.1mm Bolt rectangular pattern...

  7. #7
    Join Date
    Jul 2018
    Location
    france
    Age
    49
    Posts
    65
    Some news : front hat have been CAD designed with these pcd numbers. Before 7075 machining, i've 3d print an abs part to verify all my clearance measures to the wheel and confirm caliper mounting bracket design, pics attached.
    1.jpg
    2.jpg
    3.jpg
    Need always info about rear jag irs u-joint flange "rectangular" bolt pattern, if someone can help or give a part ref ?

  8. #8
    Join Date
    Dec 2002
    Location
    Carpark of Unearthly Delights (Sussex Division)
    Posts
    677
    I did something similar

    IMG_7712.jpeg
    Richard

    "We're going to need bigger brakes"

  9. #9
    Join Date
    Jul 2018
    Location
    france
    Age
    49
    Posts
    65
    Nice ! Is this custom made hat ?

  10. #10
    Join Date
    Dec 2002
    Location
    Carpark of Unearthly Delights (Sussex Division)
    Posts
    677
    Glad you approve. It was easier/faster to have them made by http://www.reyland.co.uk/ compared to turning them, setting up the mill and then having them anodized. Martin Hadland is the guy to speak to if you're interested. I did make the caliper adapters as they needed a bit more thought than the bells.
    Attached Images Attached Images
    Last edited by RichardG; 23-06-21 at 05:55 PM.
    Richard

    "We're going to need bigger brakes"

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