20" tire size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 07-24-2008, 11:56 PM

I think I know the answer to this, but want to run it by some people.

I'll be ordering my wheels here real shortly (probably tomorrow). I'm going to be running 20x10" with 6" backspacing and 315/35/20 in the back(tubbed rear wheel wells). I did all the measurements, and they should fit.

Here is the question. What size in the front, on 20x8 wheels (4" backspacking). I'm thinking 245/45/20. Does this sound right, and should I have any fitment issues?

The truck is bagged on stock arms, but I'll won't be driving it around all aired out.

pcmcobra · 07-25-2008, 12:04 AM

on my 86, I run 20x8.5- 4.25 BS w/ 245/40/20 up front, could have went with 45's no problem.
Mine's static dropped 5" up front.
What wheels are you getting?

Ackattack · 07-25-2008, 01:04 AM

Oh, the wheels are 8.5" wide; raceline speedsters

**FRENCHBLUE72** · 07-25-2008, 08:03 AM

Nice looking wheels...

SCOTI · 07-25-2008, 01:08 PM

245/40's to compliment the 315/35's. The 245/45's will have a taller 'looking' sidewall (they calculate out as the same dimension but the 45 series will appear taller).

Ackattack · 07-25-2008, 07:42 PM

I got the wheels ordered today.

I ended up getting 5.75" backspacing on the rears, so the lip will match that of the fronts.

Toyo discontinued the Proxes S/T tires (at least in 315/35/20), so the only other tire the guy could find me was some yokohamas that were about $500 for the package. However, Toyo is going to be coming out with 315/35/20s in the Proxes S/T IIs in September. The wheels are supposed to take 4-8 weeks to get made, so hopefully by then the Toyo tires will be out, and I can get the less expensive tires. Oh, the guy couldn't find a 245/40/20 tire either, so I'll probably go with 245/45/20 anyway. I guess we'll see in a few weeks.

big_al_71 · 07-25-2008, 08:52 PM

Those wheels look awesome

,, if you dont mind me asking who did you order from? as I am on the market for some foose nitro wheels and I am trying to find a refferred company to buy from and if possible save some $$$$

d10s69c10 · 07-25-2008, 10:43 PM

right now im running 20x 8.5 rims 5.5backspacing (were some of the early 20s to come out) and i am running general grabber 275 45 r20s all around i have no problems aside from a wee bit of rear inside fender rubbing on hard (40+) turns.

Ackattack · 08-03-2008, 03:41 PM

Quote:

Originally Posted by d10s69c10

right now im running 20x 8.5 rims 5.5backspacing (were some of the early 20s to come out) and i am running general grabber 275 45 r20s all around i have no problems aside from a wee bit of rear inside fender rubbing on hard (40+) turns.

Now I'm thinking of going with 275/40/20 for the front. Do the front tires rub on turns? How much are you lowered?

d10s69c10 · 08-03-2008, 04:45 PM

Quote:

Originally Posted by Ackattack

Now I'm thinking of going with 275/40/20 for the front. Do the front tires rub on turns? How much are you lowered?

no my front tire dont rub at all it my rears that are hitting the inside of the fenders. only running a 2/3 right now.

just so you know a 45 is the tire i think Dodges 20" stock size. making tire variety alot larger and Cheaper. when i was looking at 40's they were all about 300 bucks.

*Shane* · 08-03-2008, 05:03 PM

hey d10s69c10 ... are you running the Grabber UHP?

d10s69c10 · 08-03-2008, 10:14 PM

sure am.

*Shane* · 08-04-2008, 10:01 AM

thank you ... i have seen those on tirerack.com but was unsure about the tread pattern ...

d10s69c10 · 08-04-2008, 03:20 PM

theres the tread.

07-24-2008, 11:56 PM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	20" tire size I think I know the answer to this, but want to run it by some people. I'll be ordering my wheels here real shortly (probably tomorrow). I'm going to be running 20x10" with 6" backspacing and 315/35/20 in the back(tubbed rear wheel wells). I did all the measurements, and they should fit. Here is the question. What size in the front, on 20x8 wheels (4" backspacking). I'm thinking 245/45/20. Does this sound right, and should I have any fitment issues? The truck is bagged on stock arms, but I'll won't be driving it around all aired out. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

07-25-2008, 12:04 AM	#2
pcmcobra Registered User Join Date: Aug 2006 Location: Florida Posts: 1,684	Re: 20" tire size on my 86, I run 20x8.5- 4.25 BS w/ 245/40/20 up front, could have went with 45's no problem. Mine's static dropped 5" up front. What wheels are you getting? __________________ 1986 C10 SWB 6.0/6l90e Miami...Flee it like a native

07-25-2008, 01:04 AM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: 20" tire size Oh, the wheels are 8.5" wide; raceline speedsters __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

07-25-2008, 08:03 AM	#4
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Re: 20" tire size Nice looking wheels... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

07-25-2008, 01:08 PM	#5
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,947	Re: 20" tire size 245/40's to compliment the 315/35's. The 245/45's will have a taller 'looking' sidewall (they calculate out as the same dimension but the 45 series will appear taller). __________________ 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; 07-25-2008 at 01:09 PM.

07-25-2008, 07:42 PM	#6
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: 20" tire size I got the wheels ordered today. I ended up getting 5.75" backspacing on the rears, so the lip will match that of the fronts. Toyo discontinued the Proxes S/T tires (at least in 315/35/20), so the only other tire the guy could find me was some yokohamas that were about $500 for the package. However, Toyo is going to be coming out with 315/35/20s in the Proxes S/T IIs in September. The wheels are supposed to take 4-8 weeks to get made, so hopefully by then the Toyo tires will be out, and I can get the less expensive tires. Oh, the guy couldn't find a 245/40/20 tire either, so I'll probably go with 245/45/20 anyway. I guess we'll see in a few weeks. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

07-25-2008, 08:52 PM	#7
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: 20" tire size Those wheels look awesome,, if you dont mind me asking who did you order from? as I am on the market for some foose nitro wheels and I am trying to find a refferred company to buy from and if possible save some $$$$ __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

07-25-2008, 10:43 PM	#8
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: 20" tire size right now im running 20x 8.5 rims 5.5backspacing (were some of the early 20s to come out) and i am running general grabber 275 45 r20s all around i have no problems aside from a wee bit of rear inside fender rubbing on hard (40+) turns. __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid"

08-03-2008, 05:03 PM	#11
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: 20" tire size hey d10s69c10 ... are you running the Grabber UHP?

08-03-2008, 10:14 PM	#12
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: 20" tire size sure am. __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid"

08-04-2008, 10:01 AM	#13
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: 20" tire size thank you ... i have seen those on tirerack.com but was unsure about the tread pattern ...

08-04-2008, 03:20 PM	#14
d10s69c10 Built 4 Speed Join Date: May 2008 Location: Geneva FL Posts: 619	Re: 20" tire size theres the tread. __________________ 1969 C/10 Short Box: 496/T-56 in worx. "To Be Old And Wise, First You Must Be Young And Stupid" Last edited by d10s69c10; 08-04-2008 at 03:36 PM.

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