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Magnum 500 Rims

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StarDiero75
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Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Magnum 500 Rims

Post #1 by StarDiero75 » Thu Aug 27, 2020 7:38 pm

Howdy Guys,

So being that I'm going to disk brakes and from 4 to 5 lug, I'm going to a bigger rim, from the 14" to a 15". My question is, what width can I safely go and how much backspacing should I need? I read some things that say 15x7 with a 4.25" backspace won't fit without minor modifications and that I should do 15x6. But there's a lot more offerings for the 15x7.
Also tire size, currently I have 215s. I was thinking maybe going to 225s but again, spacing.
I'm not really sure how to make sure all this should work without having a rim and tire to put on.

Any help would be great.

Thanks guys,
Ryan
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", 2V converted built 1980 head, Autolite 2100 1.08, Dual out VI headers, Custom curved DUI, 256H Schneider cam 2.5 degrees advanced with dual roller chain, 2" exhaust with H pipe and Flowmaster 40s
--Creator of the only Weber 32/36 conversion video

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bubba22349
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Posts: 10276
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: Magnum 500 Rims

Post #2 by bubba22349 » Thu Aug 27, 2020 8:22 pm

Hi StarDiero75, the info you found is real close below is an old wheel / tire chart I have for 1964 1/2 to 1966 Mustangs that used the same basic chassis from the Falcons so back spacing is the same, (Also have it for newer 1967 to 70's too) there are some wheels up to 18 inch that will fit the early V8 5 lug Mustangs. I have fitted the 15 x 7's with enough work you might get an 8 inch on the rear with a little work rolling the fender lips it's tough getting bigger than a 6 inch on the front unless you want to do some cutting and reshaping the fenders. This info came from an old Halibrand Wheel chart (back when the Mustangs still were fairly new cars). You might have to look for the tire size conversions to the newest / current tire sizes and maybe also do a MIlimeter (MM) conversion with some brands of the newer wheels. Best of luck :nod: :thumbup:

Ford Mustang Aftermarket Tire & Wheel Sizes
Halibrand Engineering researched the Mustang wheel/tire sizing issue. For optimum results, they suggest living within these parameters for the early Mustang’s

1964 To 66 MUSTANG WHEEL/TIRE FITMENT
Wheel Size / Correct Backspace / Suggested Tire Size
15x6 4.000 in P215/70R15
15x7 4.250 in P225/60R15
15x8 4.500 in (rear only) P255/60R15 to P235/60R15
16x7 4.250 in P205/55R16 to P255/60R16
16x8 4.500 in (rear only) P225/50R16
17x7 4.250 in P205/50ZR17
17x8 4.500 in (rear only) P235/45ZR17
18x7 4.250 in P225/40ZR18
18x8 4.500 in (rear only) P245/40ZR18 to P265/35ZR18
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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StarDiero75
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Posts: 981
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Magnum 500 Rims

Post #3 by StarDiero75 » Sat Aug 29, 2020 1:52 am

bubba22349 wrote:Hi StarDiero75, the info you found is real close below is an old wheel / tire chart I have for 1964 1/2 to 1966 Mustangs that used the same basic chassis from the Falcons so back spacing is the same, (Also have it for newer 1967 to 70's too) there are some wheels up to 18 inch that will fit the early V8 5 lug Mustangs. I have fitted the 15 x 7's with enough work you might get an 8 inch on the rear with a little work rolling the fender lips it's tough getting bigger than a 6 inch on the front unless you want to do some cutting and reshaping the fenders. This info came from an old Halibrand Wheel chart (back when the Mustangs still were fairly new cars). You might have to look for the tire size conversions to the newest / current tire sizes and maybe also do a MIlimeter (MM) conversion with some brands of the newer wheels. Best of luck :nod: :thumbup:

Ford Mustang Aftermarket Tire & Wheel Sizes
Halibrand Engineering researched the Mustang wheel/tire sizing issue. For optimum results, they suggest living within these parameters for the early Mustang’s

1964 To 66 MUSTANG WHEEL/TIRE FITMENT
Wheel Size / Correct Backspace / Suggested Tire Size
15x6 4.000 in P215/70R15
15x7 4.250 in P225/60R15
15x8 4.500 in (rear only) P255/60R15 to P235/60R15
16x7 4.250 in P205/55R16 to P255/60R16
16x8 4.500 in (rear only) P225/50R16
17x7 4.250 in P205/50ZR17
17x8 4.500 in (rear only) P235/45ZR17
18x7 4.250 in P225/40ZR18
18x8 4.500 in (rear only) P245/40ZR18 to P265/35ZR18

According to your wonderful chart, 15x7 with 4.25 will fit both the rear and front, correct? If thats the case, I'm in business. The P225/60/15 was exactly what I was gonna use. Am i reading the chart right? It says that should be ok?
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", 2V converted built 1980 head, Autolite 2100 1.08, Dual out VI headers, Custom curved DUI, 256H Schneider cam 2.5 degrees advanced with dual roller chain, 2" exhaust with H pipe and Flowmaster 40s
--Creator of the only Weber 32/36 conversion video

User avatar
bubba22349
Global Moderator
Posts: 10276
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: Magnum 500 Rims

Post #4 by bubba22349 » Sat Aug 29, 2020 1:23 pm

Yes they should be the max that you can make fit with bit of work on the front. :nod:
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

User avatar
StarDiero75
Registered User
Posts: 981
Joined: Tue Jun 13, 2017 9:39 pm
Location: Bremerton, WA

Re: Magnum 500 Rims

Post #5 by StarDiero75 » Sat Aug 29, 2020 3:06 pm

bubba22349 wrote:Yes they should be the max that you can make fit with bit of work on the front. :nod:

Sick!! Thanks Bubba!

By work, do you mean "massaging" the inner part of the fenders out a little?
--1965 Ranchero w/1966 200, dual friction diaphram 9" Modern Driveline clutch and billet flywheel all balanced, 1985 SVO WC T5 with front shift, 1966 2.8 Ford 8", 2V converted built 1980 head, Autolite 2100 1.08, Dual out VI headers, Custom curved DUI, 256H Schneider cam 2.5 degrees advanced with dual roller chain, 2" exhaust with H pipe and Flowmaster 40s
--Creator of the only Weber 32/36 conversion video

User avatar
bubba22349
Global Moderator
Posts: 10276
Joined: Sun Jan 03, 2010 4:46 pm
Location: Flagstaff, Az. 86005 near the old Route 66

Re: Magnum 500 Rims

Post #6 by bubba22349 » Sat Aug 29, 2020 3:36 pm

Yes that's the biggest part of it, but you also need to check the tire tread edge & side walls for possable inner contact to chassis or suspension parts with steering at full lock to lock, and during the suspention movement. Good luck :thumbup: :nod:
Even a bad day Drag Racing is still better than a good day at work!

Current project is a 1988 John Deere 420 Garden Tractor I need a few small parts to get it fixed, plus some cosmetic items, maybe a few attachments, if you happen to have or know of JD 420 parts would welcome the help!

My Ex-Inline 6 Fleet 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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