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#1 |
Registered User
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Location: Gardnerville
Posts: 70
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Wide rear rallyes
Hello, I am starting over on a 71C10 build I started 10 years ago. Trying to figure out rear rim backspace because they need to be special ordered. I have the stock 12 bolt rear and I have added the wide Tubs. My plan is to go with 12inch wide US Wheel Rallye's in the back. They will do a custom backspace for me. I want to run the Hoosier Pro street 29x15x15 tires. I have been trying to figure it out but don't want to make a mistake on the rim backspace. So far i'm coming up with a 8.5in back space ? Has any one done this same tire and wheel combo on the wider rear axle like mine ? Based on my homemade Jig going off the drum face, I would have 8.5in in and 4.5in out. (13"overall rim width) Any help would be appreciated. Thank you
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#2 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 26,080
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Re: Wide rear rallyes
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See if this thread will help you any. http://67-72chevytrucks.com/vboard/s...d.php?t=736143 I never followed through with mine but I was thinking 7.5 BS LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 | |
Registered User
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Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
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#4 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
Mine is a 69 CST 10. I sent my center sections to Stockton California. They welded the center into a 12x15 inch blank wheel with 7 inch back spacing. If your keeping the drums, you will have no problems. I put 31x16x15 Mickey Thompson Sportsman on them. So far, works great. The only issue is if your going with steel wheels, is the weight. Their heavy.
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#5 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
If you go to the forum Lockdoc posted, you can see my truck with the 29x15x15 Mickey Thompson tires. Lots of clearance.
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#6 | |
Registered User
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Location: Gardnerville
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Re: Wide rear rallyes
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#7 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,595
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Re: Wide rear rallyes
subbed for info
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#8 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
My truck was lowered also 2 1/2 front and 4 in the rear. I have room for 14 inch wheels. I have coil springs and still have the bump stops. If I go with 14 inch wheels, they would need to be removed. If I go with 14, I would use 8 inch back space. Check the thread LockDoc has high lighted and you can read and see about my truck.
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#9 |
Registered User
![]() Join Date: Jul 2022
Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
So on your truck , found a group of 4 pics. What is the setup on there. 15x12 or 15x14 ? I made up a jig to try and measure for backspace. It looks like I have to go like 8" in or the lip will be to close to the outside ? Totally confused. I know the hoosier tire in 15x15.5 has a 15.3 in tire width with a 12" tread width. Going 29" tall . If I have to come down more? just want to make sure it doesn't hit . Appreciate the help
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#10 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
The pictures have the 15x12 with the 29 inch high tires. These wheels have the 7 inch back space. There is lots of room. This set up never once hit the bed sides or the frame or closer yet, the bump stops. If you go with the 8 inch back space, you might hit the bump stops. Check that to make sure. Now I'm still using the same wheels (15x12) with 31 inch tires. They too, have not hit any thing. I felt the 29 inch tires were to small. They didn't seem to fill the wheel well enough for me. I raised the front back up to factory height. The front tires would hit the fenders on big dips or speed bumps. I got tired of that. The back is still lowered with no issues.
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#11 | |
Registered User
![]() Join Date: Jul 2022
Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
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#12 | ||
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: Wide rear rallyes
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@ 60mph= 2377 @ 70mph= 2774 31" x 3.42 @ 40mph= 1483rpm @ 60mph= 2224 @ 70mph= 2595 Stock 'truck' ralley wheels are a common wheel to run. These 15x8's have 4" of back spacing. Widening to your specs would yield 8" of BS to keep things consistent as far as the spacing between the outer bedside lip & the edge of the wheel/tire. Your proposed 8.5"BS would work. You might need to remove the bumpstop; might not. FYI.... US Wheel might offer the wider/custom wheels but getting them can be an entirely different ordeal. I purchased 2qty 18x8" wheels & they were available/in stock via Summit. I placed a 2nd order for 2qty 18x9" wheels after verifying the fit of the 8" wheels. Five months later I still did not have my 2nd pair of wheels. I could not (nor could Summit) reach ANYONE @ US Wheel. Calls went to VM's after eventually going through & you never got a call back. The kicker? I had to 'eat' a penalty fee from Summit to return the 2qty 18x8" wheels because w/o the rear 9" wheels, the fronts were kind of useless. Not my fault. Not Summits fault but they could have waived the fee since the wheels just sat around in a box for 6months. Be ready to possibly wait.....
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 08-04-2022 at 09:16 AM. |
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#13 | |
Registered User
![]() Join Date: Jul 2022
Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
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#14 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
OneBad71, you have the exact set up I'm running. Big block 454, 400 trans, USA 3:42 gears. A real gas guzzler. I installed a Gear Vendors overdrive and one piece drive shaft. Now it's a lot fun to drive on the street and still race it at the drag strip. Runs low 12's. Still can't get the slicks to bite.
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#15 | |
Registered User
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Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
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#16 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 355
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Re: Wide rear rallyes
I don't know. Mine is a long bed. A shop here in Pa who builds rear ends and transfer cases for truck pullers built mine.
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#17 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: Wide rear rallyes
Short bed trucks can run either a 1 or 2pc drive shafts.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#18 |
Registered User
![]() Join Date: Jul 2022
Location: Gardnerville
Posts: 70
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Re: Wide rear rallyes
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