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#1 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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4/7 Drop Tire size and bs
I have been looking and searching but couldn't find anything.
I have a 71 SWB with a Ridetech coilover setup which gives me a 4/7 static drop. It has a 12 bolt rear end. What is the max tire/rim size can I use, without rubbing or tubbing out. I read that you can go up to s 315 would fit but cant find anything on the backspacing specs. If anyone have a similar setup please post tire size and backspacing. Thanks in advance. |
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#2 |
Registered User
Join Date: Dec 2012
Location: San Diego
Posts: 519
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Re: 4/7 Drop Tire size and bs
I have an ECE 4/6 kit with a 1"block for the rear making it a 4/7. I have 17 x 8 American Racing TTII's with 255/55/17 on all four corners. I have no rubbing issues front or rear. The rear is c-notched.
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#3 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
What backspace did you use? I like the idea of the 255 on front but was hoping to use 235 70/15 on front and 275 60/15 on the rear.
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#4 |
Registered User
Join Date: Dec 2012
Location: San Diego
Posts: 519
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Re: 4/7 Drop Tire size and bs
unfortunately I don't know the backspace. the truck had the wheels on it already when I bought it. sorry I couldn't help you out there.
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#5 |
Senior Member
![]() Join Date: Sep 2007
Location: Albuquerque NM
Posts: 7,848
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Re: 4/7 Drop Tire size and bs
im using 295-60-15 in the rears with 15x10 rims. 4.5" backspace
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#6 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
No worries C10Dream'n just I have the same issue on my current setup.
Michael Thanks I was thinking that the 4.5 or 5 would be the bet fit. |
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#7 |
Registered User
Join Date: Sep 2007
Location: Katy TX
Posts: 1,268
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Re: 4/7 Drop Tire size and bs
These were 17 inch billet specialties 10 inch wide wheels with 5 inch back spacing and 295 70 tires on the back. Can't remember the front tire size but the wheels were 8 inch wide 17s
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![]() Slammed 53 5 window Blown/Bagged 54 Pickup Patinaed 67 LS stepside Supercharged 67 Nova Bagged 69 Suburban Turbo'ed 5.3 LS |
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#8 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
Both trucks look good.
Thanks to all that replied. |
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#9 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: 4/7 Drop Tire size and bs
My truck is a stepside so a little less room in the wheel well, but I have 275 55 17 on 17 x 9 wheels with 5" backspacing. They fit well on the truck but I have the rear end blown apart so I haven't driven it yet, but with a fleetside you should have a TON of room for a much bigger tire than the 275. I have a leafspring truck with axle flip so about 6 1/2" lowering.
edit: the reason the rear is apart is I swapped in a '71-'72 wider axle because the 5" backspacing would not work with that wheel/tire combo on a stepside otherwise. On the front I have 2 1/2" spindles, 2" springs and 235 55 17 on 17 x 8 with 4 1/2" backspacing.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax Last edited by Mike C; 01-08-2015 at 07:52 PM. Reason: add info |
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#10 |
Active Member
![]() Join Date: Mar 2014
Location: Wichita Kansas
Posts: 100
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Re: 4/7 Drop Tire size and bs
Mine has a ECE 4/6. 255/50/18 on the front and 295/40/20 on the rear. There is plenty of room for more tire on the back. I want a little taller tire on the rear to match up the sidewalls a little better. Sorry I can't remember the backspace.
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#11 |
Registered User
Join Date: Oct 2013
Location: Massachusetts
Posts: 777
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Re: 4/7 Drop Tire size and bs
I am also enjoying the feedback in this thread because I am building a step side and want to use 17" wheels and plenty of you giving feedback are also using the same diameter wheels
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#12 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
Anyone else? Decided to run 17x9 on back with 275/50 17 5" backspace.
But the front I am going with 17 x 8 255/50 17, Would the 4.5" work? I did read that a few did go with that B.S but unsure what their drop is. |
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#13 |
Registered User
![]() Join Date: Dec 2014
Location: Plainfield il.
Posts: 643
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Re: 4/7 Drop Tire size and bs
Chevys10dr can you post a pic of your truck with the ridetech set up? I have the same kit but still far away from installing it. Thanks
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#14 |
Registered User
![]() Join Date: Oct 2005
Location: Sacramento, CA
Posts: 1,970
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Re: 4/7 Drop Tire size and bs
Here's Mine.....prob just a little lower than a 4/6
18's all around with 9.5's in back with 4.5" bs and 8's up front with 4.25" bs ![]()
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72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - ![]() My Build Thread |
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#15 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
Here is the best pic I have, its currently sitting on the wheel well. Its winter can't get out to finish. Cant wait til it warms up a bit.
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#16 |
Registered User
Join Date: Feb 2008
Location: Fort McMurray, AB
Posts: 192
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Re: 4/7 Drop Tire size and bs
BTW these are not the 255/50 17.
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#17 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: 4/7 Drop Tire size and bs
Here's a pic of my truck. Once again, a stepside which limits tire size. 275 55 17 on 17x9 with 5" bs in the rear. 235 55 17 on th 17x8 4.5" bs front.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#18 |
Registered User
Join Date: Jan 2005
Location: Brier Washington
Posts: 119
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Re: 4/7 Drop Tire size and bs
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