Bolt Circle Diameter
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Bolt Circle Diameter
i need new front rotors for my truck, its a 77 highboy. when i look up the parts there are 2 choices, pre serial Y20001 and post Y20001. my truck falls under the pre 20001 catagory, but heres the problem. when i read all the size info for the pre 20001 it says with a 5.5 in. bolt circle diameter. i thought my truck has 6.5 in BCD. something about this doesnt make sence. the wheels currently on my truck were taken from a 78 f250 and if you look up a 78 rotor it says 6.5 in bcd. is my truck supposed to have a 5.5 and some P.O. swapped something out? or are all the part houses info wrong? btw my truck has a low pinion d44 with the big external hubs, if that helps any. i'm hoping that it is supposed to be a 6.5 BCD because the rotors are about half the price of the ones with the 5.5 BCD.
Bob
Bob
Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by ChaseTruck754
Pre 97 8 lug trucks (F-250 and 350) are 6.5 bolt circle
Pre 97 5 lug trucks (F-150) are the 5.5 bolt circle.
I think all the F-100's were 5 lug 4.5 bolt circle - if not some may be 5x5.5
Pre 97 5 lug trucks (F-150) are the 5.5 bolt circle.
I think all the F-100's were 5 lug 4.5 bolt circle - if not some may be 5x5.5
Excepting the 1980/83 F100's, all the F100-F150 wheels are the same or will interchange.
1983 = last F100.
Last edited by NumberDummy; Oct 17, 2007 at 12:46 PM.
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From: Dracut, Massachusetts
Taken directly from partsamerica.com but the same info on many other sites
Rotor Specifications:<O
Type: Rotor<O
Number of Bolts/Holes: 8<O
Bolt Circle Dimension: 5.5"<O
Discard Thickness: 1.18"
New Surface Thickness: 1.245"
Outside Diameter: 12.56"
Overall Height: 3.308"
Vented/Solid Design: Vented
Composite Design?: No
Outer Bearing Cup Included?: No
Inner Bearing Cup Included?: No
ABS Sensor Ring?: No
The other rotor, which is not supposed to be the one for my truck reads...
Rotor Specifications:
Now, if by some magical occurrence of events my truck has an 8 lug 5.5 bolt pattern, then a wheel from a 78 f250 will NOT fit correct?
Rotor Specifications:<O
Type: Rotor<O
Number of Bolts/Holes: 8<O
Bolt Circle Dimension: 5.5"<O
Discard Thickness: 1.18"
New Surface Thickness: 1.245"
Outside Diameter: 12.56"
Overall Height: 3.308"
Vented/Solid Design: Vented
Composite Design?: No
Outer Bearing Cup Included?: No
Inner Bearing Cup Included?: No
ABS Sensor Ring?: No
The other rotor, which is not supposed to be the one for my truck reads...
Rotor Specifications:
- Type: Rotor
- Number of Bolts/Holes: 8
- Bolt Circle Dimension: 6.5"
- Discard Thickness: 1.18"
- New Surface Thickness: 1.245"
- Outside Diameter: 12.56"
- Overall Height: 3.225"
- Vented/Solid Design: Vented
- Composite Design?: No
- Outer Bearing Cup Included?: No
- Inner Bearing Cup Included?: No
- ABS Sensor Ring?: No
Now, if by some magical occurrence of events my truck has an 8 lug 5.5 bolt pattern, then a wheel from a 78 f250 will NOT fit correct?
Lead Driver
Joined: May 2007
Posts: 6,993
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From: Costa Mesa, CA
The website can say what it wants. Unless someone put a 97 or newer axle in your truck your bolt circle is 8x6.5. Even if it was a 97 or newer the bolt pattern still isn't a 5.5 bolt circle.
Also - just for reference the 8 lug pattern is the same as chevy's & Dodges from way back when until today. Only Ford got the "we should change to metric" brain fart...
Also - just for reference the 8 lug pattern is the same as chevy's & Dodges from way back when until today. Only Ford got the "we should change to metric" brain fart...
Last edited by ChaseTruck754; Oct 17, 2007 at 01:20 PM.
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Posting Guru
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From: Dracut, Massachusetts
i knew that, but it just doesnt make any sence. well, thanks for the help guys this just means i wont have to spend 100+ on each rotor! OH HAPPY DAY!
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Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by 77f2504by4
i knew that, but it just doesnt make any sence. well, thanks for the help guys this just means i wont have to spend 100+ on each rotor! OH HAPPY DAY!
Ford part number for the front hub and rotor ~ 1976/77 F250 4WD before serial number Y20,001.
D6TZ-1102-E
Source: 1973/79 Ford Light Truck Parts Catalog.
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Lead Driver
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From: Costa Mesa, CA
The 7 lug fords are the newer heavy duty F-150 lug pattern. Only offered on the heavy tow package one. And yes - I think they are metric as well. try finding aftermarket rims for those...
Junior User
Joined: Oct 2007
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From: alaska
Originally Posted by ChaseTruck754
The 7 lug fords are the newer heavy duty F-150 lug pattern. Only offered on the heavy tow package one. And yes - I think they are metric as well. try finding aftermarket rims for those...
Ray
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From: Montana Territory
Chevy uses the 8x170 pattern as well, Ford DRW F350s are 8x200, ALL pre 97 f250/F350 SRW are 8x6.5
All Dodges (250/350) are 8x6.5
The 7 Lug pattern in an option on new F150s, standard on F150s with the 7700lb payload, and Light Duty F250s 97-99. It is metric, 7x150.
All Dodges (250/350) are 8x6.5
The 7 Lug pattern in an option on new F150s, standard on F150s with the 7700lb payload, and Light Duty F250s 97-99. It is metric, 7x150.
Elder User
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From: Northern Colorado
"Chevy uses the 8x170 pattern as well"
Not sure where you got that information, but my '08 3500HD Silverado still uses 8x6.5 and I'm not aware of any older Chev's ever switching to 8x170. The offset, however, would make any of these factory wheels undesireable for the older iron, imho.
Not sure where you got that information, but my '08 3500HD Silverado still uses 8x6.5 and I'm not aware of any older Chev's ever switching to 8x170. The offset, however, would make any of these factory wheels undesireable for the older iron, imho.
Lead Driver
Joined: May 2007
Posts: 6,993
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From: Costa Mesa, CA
Yeah - which trucks went metric. As far as I know and have seen the new chevy's are all 8x6.5 still. As was said the offset isn't great for our trucks, plus the center bore on the wheels won't fit over our D60 hubs...
Postmaster
Joined: Aug 2000
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From: Eldorado Ca. USA
While we are on the hijack about talking about rims, you need to pay attention to the hub diameter holes of the rims you want to buy. GM and dodge are smaller than the fords, and the fords got bigger as the years went on. 4-15/16" is the one that should fit everything, but will place all of the load on the lugnuts instead of the hub, so watch out 
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