Fitting Tires on Wheels (16.5 x 8.25) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OldCreek · 12-26-2007, 07:52 AM

More specifically for 16.5" x 8.25" wheels but also with other sizes. With already limited tire selection (33" and greater), most of these tires are recommended by the mfg to fit on 9.75" wheels. The only tire I saw listed by the mfg for 8.25" wheels was ProComp 33x12.5. (I think Interco had one also.) Even BFG listed their 33x12.5 to mount on 9.75" wheels. Is it safe to mount the BFG on 8.25"?

Can we safely mount 35 x 12.5? How about 37 x 12.5? Obviously, the listed tire width is the same. There doesn't seem to the the rim width range with 16.5 as with other wheel sizes. Is that secondary to the bead, or lack there of?

I think a lot of us have 16.5 x 8.25 wheels out here. Can we only run the 33x12.5?

DieselEater · 12-26-2007, 08:10 AM

Fit one, then air up to maximum pressure. If it has a noticable crown in the tread, or the bead looks like its just gonna let go, then I'd go wider. I think a 12.50 would be fine on an 8.25 regardless of manufacture.

Call Big O tire, and they'll read from the chart for you, what is suggested width for each tire size.
A.......

CG · 12-26-2007, 08:53 AM

I used to have 33 12.5 15 All Terrains mounted on 15x8 4x4 ralley wheels. I didn't off road with it, but I hauled quite a bit of stuff. Never had a problem.

**special-K** · 12-26-2007, 01:22 PM

Is this a 4wd?No problem mounting 12.50s on 8.25s.If it`s a 2wd there are 9.50s out there.Check General Tire and other companies that make a full line of tires.

12-26-2007, 07:52 AM	#1
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Fitting Tires on Wheels (16.5 x 8.25) More specifically for 16.5" x 8.25" wheels but also with other sizes. With already limited tire selection (33" and greater), most of these tires are recommended by the mfg to fit on 9.75" wheels. The only tire I saw listed by the mfg for 8.25" wheels was ProComp 33x12.5. (I think Interco had one also.) Even BFG listed their 33x12.5 to mount on 9.75" wheels. Is it safe to mount the BFG on 8.25"? Can we safely mount 35 x 12.5? How about 37 x 12.5? Obviously, the listed tire width is the same. There doesn't seem to the the rim width range with 16.5 as with other wheel sizes. Is that secondary to the bead, or lack there of? I think a lot of us have 16.5 x 8.25 wheels out here. Can we only run the 33x12.5? __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

12-26-2007, 08:10 AM	#2
DieselEater Registered User Join Date: Dec 2006 Location: Trinidad, Colorado Posts: 642	Re: Fitting Tires on Wheels (16.5 x 8.25) Fit one, then air up to maximum pressure. If it has a noticable crown in the tread, or the bead looks like its just gonna let go, then I'd go wider. I think a 12.50 would be fine on an 8.25 regardless of manufacture. Call Big O tire, and they'll read from the chart for you, what is suggested width for each tire size. A....... __________________ 69' 3/4 4X4 470ci BBC 700 HP.... D60/14bolt 205/465 http://profile.myspace.com/index.cfm...ndid=127691959 Last edited by DieselEater; 12-26-2007 at 08:10 AM. Reason: add to message...

12-26-2007, 08:53 AM	#3
CG BlahBlahBlah Join Date: Feb 2002 Location: Wa. Posts: 20,019	Re: Fitting Tires on Wheels (16.5 x 8.25) I used to have 33 12.5 15 All Terrains mounted on 15x8 4x4 ralley wheels. I didn't off road with it, but I hauled quite a bit of stuff. Never had a problem.

12-26-2007, 01:22 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Fitting Tires on Wheels (16.5 x 8.25) Is this a 4wd?No problem mounting 12.50s on 8.25s.If it`s a 2wd there are 9.50s out there.Check General Tire and other companies that make a full line of tires. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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