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03-22-2013, 08:07 AM
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#1 |
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Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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20" BOSS 338 backspacing??
What is the proper backspacing used for mounting 20" BOSS 338s on an 81 C-10 pickup?
Fronts - 20 x 8.5 and rears 20 x 10 Thanks, RIZ 
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06-25-2013, 01:31 PM
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#2 |
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Bretzke Racing Inc.
Join Date: Jun 2008
Location: Houston, Texas
Posts: 114
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Re: 20" BOSS 338 backspacing??
bump...
I'd like to know the same thing but with a 4.5/6 drop Kris
__________________
1982 Chevy Silverado C-10 RCLWB - IN PAINT - Inferno Orange Metallic Lowered 4.5/6 - 358 SBC 10.5:1, Comp XE268H cam, Aluminum heads, 650 Double pumper Holley carb, 2400 Holeshot Converter, upgraded T/h350 Trans. Stock Rear end for now (3.08 gear)  2004 Chevy Silverado 1500 LS RCSWB - Dark Spiral Gray Metallic Lowered 2/4 - 4.8L V8 4L60E 10-bolt. some goodies --- NEW DD 11/9/12  "Expect the Un-expected" "Gas, Grass, Or Ass...No one rides for FREE!" 
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06-25-2013, 01:37 PM
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#3 |
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Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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Re: 20" BOSS 338 backspacing??
Mine will also have the 4.5/6 drop.
RIZ |
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06-25-2013, 02:22 PM
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#4 |
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
Here's my wheel tire specs with roughly 6/8 drop...
Boss 338's - 20x8.5 with 255/35/20 & 5.25 backspacing up front 20x10 with 275/35/20 & 5.5 backspacing in the back |
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06-25-2013, 08:50 PM
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#5 |
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Registered User
Join Date: Oct 2010
Location: Dallas, TX
Posts: 432
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Re: 20" BOSS 338 backspacing??
I didn't know Boss gives you different backspacing options for the 338s
__________________
1977 SWB C10 - "Woodson": 5.3 Vortec LS Swap, 4L60e Trans, 4.5/5 drop |
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06-25-2013, 09:10 PM
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#6 |
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Registered User
Join Date: Aug 2010
Location: AZ
Posts: 3,069
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Re: 20" BOSS 338 backspacing??
5.25 on a 8.5" wheel up front, and a 5.5" on a 10" wheel in the back is ideal in my opinion.... for a static dropped truck.
Very nice looking truck Jwall!!! I really like it. |
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06-25-2013, 09:39 PM
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#7 |
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Bretzke Racing Inc.
Join Date: Jun 2008
Location: Houston, Texas
Posts: 114
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Re: 20" BOSS 338 backspacing??
Awesome! Thank you JWall! Very sharp lookin' pick-up you have there!
Now it's time for me to start looking for tire choices.... Ha! Posted via Mobile Device
__________________
1982 Chevy Silverado C-10 RCLWB - IN PAINT - Inferno Orange Metallic Lowered 4.5/6 - 358 SBC 10.5:1, Comp XE268H cam, Aluminum heads, 650 Double pumper Holley carb, 2400 Holeshot Converter, upgraded T/h350 Trans. Stock Rear end for now (3.08 gear) 2004 Chevy Silverado 1500 LS RCSWB - Dark Spiral Gray Metallic Lowered 2/4 - 4.8L V8 4L60E 10-bolt. some goodies --- NEW DD 11/9/12 "Expect the Un-expected" "Gas, Grass, Or Ass...No one rides for FREE!"
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06-26-2013, 11:45 AM
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#8 |
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
Thanks guys!
I am pleased with the wheels for a budget option... just a little grinding on the rotors & they worked out great. Backspacing is right on. Although, I plan to upgrade them in the near future. |
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06-26-2013, 01:15 PM
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#9 |
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Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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Re: 20" BOSS 338 backspacing??
Grinding on the rotors? Did you buy older versions of the rims before they corrected them or are you running the thicker rotors?
RIZ |
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06-26-2013, 01:17 PM
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#10 | |
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67-72 parts collector,…
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,701
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Re: 20" BOSS 338 backspacing??
Quote:
They added a deeper center cap so your dust cap would work. That's it. Grind the nose of the rotor. Done. 5 minutes per side,... max.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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06-26-2013, 01:20 PM
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#11 | ||
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
Quote:
Quote:
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06-27-2013, 11:01 AM
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#12 | |
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Registered User
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
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Re: 20" BOSS 338 backspacing??
Quote:
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08-01-2013, 12:50 PM
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#13 |
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Registered User
Join Date: Jul 2013
Location: Carlsbad NM
Posts: 8
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Re: 20" BOSS 338 backspacing??
i have a static 5/6 drop on mine, whats the opinion of running 22's with backspacing of 5.75. would this work?
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08-01-2013, 08:36 PM
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#14 |
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TNT-MOTORSPORTS
Join Date: Mar 2008
Location: TULSA OKLAHOMA
Posts: 2,692
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Re: 20" BOSS 338 backspacing??
Here's my wheel tire specs with roughly 6/8 drop...
Boss 338's - 20x8.5 with 255/35/20 & 5.25 backspacing up front 20x10 with 275/35/20 & 5.5 backspacing in the back I agree with sizes as well they offer different backspacing, getting them is another story. I HAVE THESE EXACT SIZES AND BACKSPACING IN STOCK IN THE GRAY FINISH. AND CAN GET BLACK ,I JUST GOT 2 BLACK 8.5'S IN FOR A CUSTOMER AND THE 20x10'S ARE ON THE WAY http://www.67-72chevytrucks.com/vboa...=567778&page=3 |
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10-06-2014, 04:04 PM
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#15 |
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Registered User
Join Date: Mar 2010
Location: Ocala, Fl.
Posts: 39
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Re: 20" BOSS 338 backspacing??
Jwall, I was going to PM you but thoughts other could benefit from this information.
Could you take some more close up pics of the wheels you have on there. I am thinking about these for my 71 and super excited that they finally changed out the backspacing on these to get a little more lip on them while keeping the wide rim/tire setup. Thank You |
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10-06-2014, 04:13 PM
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#16 |
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
I have already taken them off the 76...
but here are a few more pics... They are now on my 98... |
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10-06-2014, 04:51 PM
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#17 | |
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Registered User
Join Date: Mar 2010
Location: Ocala, Fl.
Posts: 39
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Re: 20" BOSS 338 backspacing??
Quote:
JWALL, They look killer on those trucks. I could be biased though because I just recently sold my Victory Red 91' and picked up a red 71' haha. We have similar taste. I never got into the 73-87 but I am learning to appreciate the body style more now. Thanks for the pictures! Some close ups on the 98 would be good too. Honestly, I want to see the lip on those wheels. Thank You Ulysses |
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10-06-2014, 05:05 PM
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#18 |
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
Thanks!
I like them better on my 98 than I did on the 76 although the fitment on the 76 was great just didn't like the style. I am a billet wheel guy! I can get some pics of the wheels in the next night or 2. |
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10-06-2014, 06:03 PM
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#19 |
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Registered User
Join Date: Mar 2010
Location: Ocala, Fl.
Posts: 39
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Re: 20" BOSS 338 backspacing??
I could be biased because I just love the wheels. I sold the truck and after much research I find it hard to buy another wheel other than these same ones. However I like the deeper dish with the 18s that I had. The other option would be raceline with 12s in back but thats like 7-8 hundred a wheel and the like for the back tires. These wheels are such a cheap option and tires are available too.
Thank You Ulysses |
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10-06-2014, 10:50 PM
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#20 |
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TNT-MOTORSPORTS
Join Date: Mar 2008
Location: TULSA OKLAHOMA
Posts: 2,692
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Re: 20" BOSS 338 backspacing??
I have the 20X10's 5.50 BS in stock and have a pair or 20X8.5 5.25 BS that will be in ... in a day or two. If you like a little more tire you could do 255/40/20's and 285/40/20's or even 295/40/20's ..... Gets a little more sidewall and a little better ride because of it.
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10-07-2014, 08:22 AM
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#21 |
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Frequent Flyer
Join Date: Aug 2009
Location: Tulsa, OK
Posts: 2,258
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Re: 20" BOSS 338 backspacing??
Took these with my phone last night...
Front... Rear... |
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