Got some new wheels: Boss 338's in 20x10 and 20x8.5 - Page 18 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Beatcoaster · 12-11-2009, 09:49 PM

Hmmm 22's eh? I wonder how those would work with a 3/5 drop...wonder if it would rub with a 40 series tire while turning...

Dirty McFast · 12-12-2009, 12:52 AM

Quote:

Originally Posted by lolife99

Those are tall tires,...
(29" and 29.7" tall)
The rear tires might work,... but those front will be really tall on a static dropped truck.

They just threw those tires in to try and sell me. What do you think would be a good size to run? I do have a 4/6 drop. I was actually looking at 255/50/18 and 285/45/20 (or 285/50/20).

**lolife99** · 12-12-2009, 01:24 AM

Quote:

Originally Posted by Dirty McFast

They just threw those tires in to try and sell me. What do you think would be a good size to run? I do have a 4/6 drop. I was actually looking at 255/50/18 and 285/45/20 (or 285/50/20).

Just my opinion,...
but I don't like 18's and 20's.
I would runs a 20x8.5 with a 255/40-20 and a 20x10 with a 295/40-20.
A 50 series tire is too tall for a 4/6 drop.

There will most like be issues with any 4/6 drop and a tire larger than 26" tall, rubbing on the inner fenders. (on large bumps in the road).
73-87 trucks will be worse due to the shape of the inner fenders.

BossHogg69 · 12-12-2009, 02:27 AM

Quote:

Originally Posted by Dirty McFast

They just threw those tires in to try and sell me. What do you think would be a good size to run? I do have a 4/6 drop. I was actually looking at 255/50/18 and 285/45/20 (or 285/50/20).

285/50's are 31.25" tall. i seriously doubt they'll work with a 4/6.

lolife is right on with the 40-series tire rec. for 20's.

Strut · 12-12-2009, 09:22 AM

Here is something you guy that are looking for tire can use:

Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).

225mm / 25.4 = 8.86"

Sidewall Aspect Ratio

Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

Just throwing it out there!

DroppedAsAChild · 12-12-2009, 09:37 AM

On my OBS 99 Im running 245/50/20 upfront and 255/50/20 out back on a 4/6. Like i posted earlier. I know there different clearance issues from the 67-72's and the 88-98's but. It is possible to run a 50 series tire on a 4 inch drop. I ran 255/50/20 up front for a while, it rubbed on larger bumps and dips but it still fit. I didnt want to rub at all so i went with smaller upfront.

**lolife99** · 12-12-2009, 11:06 AM

Quote:

Originally Posted by Strut

Here is something you guy that are looking for tire can use:

Section Width

Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).

225mm / 25.4 = 8.86"

Sidewall Aspect Ratio

Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

Just throwing it out there!

Good info.
I use Miata Tire Size Calculator. I'm not sure if it's 100% accurate,... but it's close.

http://www.miata.net/garage/tirecalc.html

love my 72 · 12-14-2009, 08:34 PM

ok,

I dont know if we covered this but i spoke with the vendor who quoted me and the guy claims to have these wheels on a 68 Pick up with a 5 lug conversion and that all he needed was 1/4 inch spacer in the front wheels on standard length lug studs, and no problems.

Any thought son this? I personaly dont like that idea too much but it is a nice American made wheel for the $$

**lolife99** · 12-14-2009, 08:48 PM

Quote:

Originally Posted by love my 72

ok,

I dont know if we covered this but i spoke with the vendor who quoted me and the guy claims to have these wheels on a 68 Pick up with a 5 lug conversion and that all he needed was 1/4 inch spacer in the front wheels on standard length lug studs, and no problems.

Any thought son this? I personaly dont like that idea too much but it is a nice American made wheel for the $$

I put my front 20x8.5" wheel on a 5-lug 1.25" wide rotor and there was at least a 1/2" gap keeping the wheel from making contact with the face of the rotor.

Maybe the '68 had 1" rotors.
As far as I know this is the only solution (except machining the rotor) to make the old design work.

**lolife99** · 12-14-2009, 08:54 PM

My old rotor comparison pics.
I say buy a set and let us know how it turns out using the 1/4" spacers.
Looks like you would need longer lug studs.

Strut · 12-15-2009, 12:24 AM

Quote:

Originally Posted by lolife99

My old rotor comparison pics.
I say buy a set and let us know how it turns out using the 1/4" spacers.
Looks like you would need longer lug studs.

Where can a guy get these 1 inch rotors? Do you have any Part #'s for them?

brossow · 12-15-2009, 01:07 AM

Quote:

Originally Posted by Strut

Where can a guy get these 1 inch rotors? Do you have any Part #'s for them?

They're just the light-duty rotors. Should be able to find them at any auto parts store by looking up the base model for your particular year, I would think.

Keep in mind that the narrower rotors may require different calipers as well. Not sure about that.

**Hart_Rod** · 12-15-2009, 01:45 AM

Quote:

Originally Posted by brossow

They're just the light-duty rotors. Should be able to find them at any auto parts store by looking up the base model for your particular year, I would think.

Keep in mind that the narrower rotors may require different calipers as well. Not sure about that.

and spindles.....

**lolife99** · 12-15-2009, 02:16 AM

Yep.
Requires 1" rotor, and compatible caliper, and spindle.
If you are installing these on any truck other than a 73-87 (73-91 'burb),... you will need to swap ball joints and tie rod ends as well.

brossow · 12-15-2009, 02:17 AM

Quote:

Originally Posted by lolife99

Yep.
Requires 1" rotor, and compatible caliper, and spindle.
If you are installing these on any truck other than a 73-87 (73-91 'burb),... you will need to swap ball joints and tie rod ends as well.

But other than that, it's a piece of cake.

(Seriously, just wait a few weeks for the corrected wheels to come to market.)

**lolife99** · 12-15-2009, 02:30 AM

Quote:

Originally Posted by brossow

But other than that, it's a piece of cake.

(Seriously, just wait a few weeks for the corrected wheels to come to market.)

I know what you are saying.
I am rebuilding the entire front suspension on my '86 anyway,... so I just have to use the correct 1" rotor parts.

Now if the wheels end up on my '69,... I will be swapping out a ton of good parts just to bolt them up.

Ha,... and 5 months of "waiting just a few more weeks".

brossow · 12-15-2009, 11:31 PM

Quote:

Originally Posted by lolife99

I know what you are saying.
I am rebuilding the entire front suspension on my '86 anyway,... so I just have to use the correct 1" rotor parts.

Now if the wheels end up on my '69,... I will be swapping out a ton of good parts just to bolt them up.

Ha,... and 5 months of "waiting just a few more weeks".

I don't get why you'd downgrade your braking to accommodate a poorly designed wheel. But that's just me.

**lolife99** · 12-15-2009, 11:57 PM

Quote:

Originally Posted by brossow

I don't get why you'd downgrade your braking to accommodate a poorly designed wheel. But that's just me.

Rotor is only .250" thinner.
Diameter of the rotor is the same.
Caliper will function the same.

The real reason,... all four 20's for $700.

love my 72 · 12-16-2009, 12:09 AM

I Agree with lolife,

I imagine that the .250 thickness will make a minimal measurable downgrade to the braking efficiency.

Hopefully the corrected hub will be available by the time i "need" the rims

SCOTI · 12-16-2009, 12:25 AM

Quote:

Originally Posted by love my 72

I Agree with lolife,

I imagine that the .250 thickness will make a minimal measurable downgrade to the braking efficiency.

Hopefully the corrected hub will be available by the time i "need" the rims

For a cruiser/lt.duty truck that doesn't see 'hard' life, the 1.00" rotor combo would be fine. If you tug a trailer around.... 1.25" rotors are better suited.

**rob32472** · 12-17-2009, 06:03 PM

ok guys i have been told the new wheel is avail so I ordered them today...... was told I could return if they dont fit. I will post pics when they arrive

sixty8c10 · 12-17-2009, 06:34 PM

where'd you order from, is a group an option?

Hickup pickup · 12-17-2009, 06:39 PM

PT Barnum once said " there's a SUCKER born every minuite!.

Strut · 12-17-2009, 06:50 PM

Quote:

Originally Posted by rob32472

ok guys i have been told the new wheel is avail so I ordered them today...... was told I could return if they dont fit. I will post pics when they arrive

Hope they fit.....

**lolife99** · 12-17-2009, 08:02 PM

Quote:

Originally Posted by rob32472

ok guys i have been told the new wheel is avail so I ordered them today...... was told I could return if they dont fit. I will post pics when they arrive

Let us know your outcome with the wheels you ordered.
Several sources are saying they are still weeks (if not months) away from being ready with the new design.

12-11-2009, 09:49 PM	#426
Beatcoaster 69 Fleetside Join Date: Mar 2009 Location: Lake Stevens, WA Posts: 333	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 Hmmm 22's eh? I wonder how those would work with a 3/5 drop...wonder if it would rub with a 40 series tire while turning...

12-12-2009, 09:22 AM	#430
Strut Registered User Join Date: Oct 2009 Location: Corbin Ky Posts: 247	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 Here is something you guy that are looking for tire can use: Section Width Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters. P225/50R16 91S The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch). 225mm / 25.4 = 8.86" Sidewall Aspect Ratio Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio. P225/50R16 91S The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall. Just throwing it out there! __________________ 1972 Chevy C10 SWB 1999 GMC Sonoma Mini 2008 Yamaha R1 2007 Harley Nightster

12-12-2009, 09:37 AM	#431
DroppedAsAChild Registered User Join Date: Nov 2009 Location: Ontario, Canada Posts: 130	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 On my OBS 99 Im running 245/50/20 upfront and 255/50/20 out back on a 4/6. Like i posted earlier. I know there different clearance issues from the 67-72's and the 88-98's but. It is possible to run a 50 series tire on a 4 inch drop. I ran 255/50/20 up front for a while, it rubbed on larger bumps and dips but it still fit. I didnt want to rub at all so i went with smaller upfront. __________________ 1999 OBS Gmc Sierra ECSB Classic 1500 2wd-The Show truck (Black/Greystone metallic 2 tone) 1999 OBS GMC Yukon 4dr 2wd-Daily Driver/Toy (White) 1990 OBS GMC Sierra ST RCSS 2wd-100% Factory Original (Crimson Red/Metallic Silver 2 tone) 1997 OBS Chevrolet Silverado ECSB 2wd-Pops Daily/Tow Pig (White)

12-14-2009, 08:34 PM	#433
love my 72 Registered User Join Date: Jul 2000 Location: East Bay,CA Posts: 298	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 ok, I dont know if we covered this but i spoke with the vendor who quoted me and the guy claims to have these wheels on a 68 Pick up with a 5 lug conversion and that all he needed was 1/4 inch spacer in the front wheels on standard length lug studs, and no problems. Any thought son this? I personaly dont like that idea too much but it is a nice American made wheel for the $$ __________________ 51 Chevy 3100 Deluxe Cab(SOLD) 65 **stang 6cyl 70 C10 Long Bed Fleetside(1st truck,thanks Dad![SOLD]) 72 C10 Short Bed Fleetside 73 Blazer 2WD Catalina Blue White Top(Needs Love) 73 Blazer 2WD Work in progress LT1/4L60E 83 Grand National (SOLD) 94 Blazer K1500 Silverado (SOLD) 96 Impala SS All original (NEXT IN LINE 2 B SOLD) 99 Tahoe 2DR, 2WD

12-14-2009, 08:54 PM	#435
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 My old rotor comparison pics. I say buy a set and let us know how it turns out using the 1/4" spacers. Looks like you would need longer lug studs. Attached Images __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

12-15-2009, 02:16 AM	#439
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 Yep. Requires 1" rotor, and compatible caliper, and spindle. If you are installing these on any truck other than a 73-87 (73-91 'burb),... you will need to swap ball joints and tie rod ends as well. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

12-16-2009, 12:09 AM	#444
love my 72 Registered User Join Date: Jul 2000 Location: East Bay,CA Posts: 298	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 I Agree with lolife, I imagine that the .250 thickness will make a minimal measurable downgrade to the braking efficiency. Hopefully the corrected hub will be available by the time i "need" the rims __________________ 51 Chevy 3100 Deluxe Cab(SOLD) 65 **stang 6cyl 70 C10 Long Bed Fleetside(1st truck,thanks Dad![SOLD]) 72 C10 Short Bed Fleetside 73 Blazer 2WD Catalina Blue White Top(Needs Love) 73 Blazer 2WD Work in progress LT1/4L60E 83 Grand National (SOLD) 94 Blazer K1500 Silverado (SOLD) 96 Impala SS All original (NEXT IN LINE 2 B SOLD) 99 Tahoe 2DR, 2WD

12-17-2009, 06:03 PM	#446
rob32472 Registered User Join Date: May 2007 Location: dallas ga Posts: 1,505	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 ok guys i have been told the new wheel is avail so I ordered them today...... was told I could return if they dont fit. I will post pics when they arrive

12-17-2009, 06:34 PM	#447
sixty8c10 MY EX DRIVES A BROOM Join Date: Nov 2003 Location: Herington, KS Posts: 869	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 where'd you order from, is a group an option? __________________ They say nobody's perfect. I'm a nobody, so I must be perfect. Building Nemo -1968 C10 Long Bed FRED -1947 KB-2 International

12-17-2009, 06:39 PM	#448
Hickup pickup Registered User Join Date: Dec 2008 Location: Gilbert , Az Posts: 369	Re: Got some new wheels: Boss 338's in 20x10 and 20x8.5 PT Barnum once said " there's a SUCKER born every minuite!. __________________ 2-20, 2-21 whatever it takes!



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