Boss 338 wheel questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Flubyu · 06-15-2022, 10:13 PM

Here’s my situation. I have a 71 C10, lowered 3/5. I have a chance to buy some 18x9.5 338’s with 255/55/18 tires. The price is great and the wheels are the style I’m looking for…just unsure if these will fit and look correctly on my truck. I looked on the wheels, but I can’t see what the backspacing measurement is. Any help or advice is appreciated. Thanks all

1slo64 · 06-16-2022, 11:50 AM

From what I've looked up the 18x9.5 has a 5.09 inch backspace.

Flubyu · 06-17-2022, 01:13 PM

Thank you for that info. Knowing the backspacing is 5.09" will that be OK for fitment on my truck? I don't have a good knowledge of that.

SCOTI · 06-20-2022, 11:26 AM

Can they fit? Yes.

Will they fit? It's subjective. It will depend on what you like visually. What works for you may not 'work' for me.

I would suggest measuring a current wheel for a baseline & using that to determine clearances & fit within the wheel well.

What about doing a test fit to see if you like the look? All 4 wheels the same size? That def plays into the visual aspect depending on the trucks suspension set-up & other specifics.

Flubyu · 06-22-2022, 12:25 AM

Wheels are 9.5 all the way around. I’m hoping to be able to test fit them before I buy. Thanks for the helps guys

06-15-2022, 10:13 PM	#1
Flubyu Registered User Join Date: Mar 2017 Location: Clever, Mo Posts: 69	Boss 338 wheel questions Here’s my situation. I have a 71 C10, lowered 3/5. I have a chance to buy some 18x9.5 338’s with 255/55/18 tires. The price is great and the wheels are the style I’m looking for…just unsure if these will fit and look correctly on my truck. I looked on the wheels, but I can’t see what the backspacing measurement is. Any help or advice is appreciated. Thanks all __________________ '71 C-10 SWB Shop Truck Currently 350/350, soon to be LS'd.

06-16-2022, 11:50 AM	#2
1slo64 Registered User Join Date: Feb 2019 Location: Madison, AL Posts: 324	Re: Boss 338 wheel questions From what I've looked up the 18x9.5 has a 5.09 inch backspace. __________________ 1964 GMC Fleetside SWB 1966 Mustang Coupe 2013 Tahoe LT

06-17-2022, 01:13 PM	#3
Flubyu Registered User Join Date: Mar 2017 Location: Clever, Mo Posts: 69	Re: Boss 338 wheel questions Thank you for that info. Knowing the backspacing is 5.09" will that be OK for fitment on my truck? I don't have a good knowledge of that. __________________ '71 C-10 SWB Shop Truck Currently 350/350, soon to be LS'd.

06-20-2022, 11:26 AM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: Boss 338 wheel questions Can they fit? Yes. Will they fit? It's subjective. It will depend on what you like visually. What works for you may not 'work' for me. I would suggest measuring a current wheel for a baseline & using that to determine clearances & fit within the wheel well. What about doing a test fit to see if you like the look? All 4 wheels the same size? That def plays into the visual aspect depending on the trucks suspension set-up & other specifics. __________________ 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.*

06-22-2022, 12:25 AM	#5
Flubyu Registered User Join Date: Mar 2017 Location: Clever, Mo Posts: 69	Re: Boss 338 wheel questions Wheels are 9.5 all the way around. I’m hoping to be able to test fit them before I buy. Thanks for the helps guys __________________ '71 C-10 SWB Shop Truck Currently 350/350, soon to be LS'd.



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