Need Wheel size Help!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crazy4chevs · 06-03-2004, 07:10 PM

Need larger wheel size help!!!
first off I have a ECE 4-6 drop on my 68 short fleet 2wd with disc brakes

I was looking at 18x8 for the front. Come to find out they qiut making them in the 18x8" and now only offer it in the 18x9 with 5 1/2 BSM, will this work on the front? Is it to wide? (big)?

The rear is a little differnt and so I just have a backspace Question.
I wanted to use the 18x9 in the rear.
My disc brake ford 9" is 1" wider than the 71-72 style rear and so I need to find out roughly what backspacing I should use any ideas?

Here is the wheel
Boss 304

67shortie · 06-04-2004, 01:40 AM

To my knowledge the front backspacing should be about 1/2 of the rim size, so an 8 inch rim would have a 4 inch backspace to keep the loads off of the bearings. So, your front with a 9 inch should be approx 4.5 inches to keep it close.

The rear, I have seen 5.5 inch backspacing on stock rearend withs with problems with frame interference, so most suggest a 4.5 backspace on a 9.5 inch rim. This is what I will be purchasing when the time comes to buy. But since your rear is one inch wider than stock, the 5.5 may just be right on the money or close to it. the only way I know of to properly do this is to either mount rims that are similar (width/backspacing) or use one of those nice wheel measuring devices (the actual name slips my mind) at a tire store or a borrowed one.

crazy4chevs · 06-04-2004, 11:38 AM

Great,
Thats the kind of info im looking for. Anyone else??

,

67chevemall · 06-04-2004, 02:56 PM

This is also driving me nuts! I have 24.5X9.5 " tires on my front right now and they don't rub! I have a 26X8" spare and that don't rub!
I am going with the Weld velocity 6 rim but can't decide on the size!

18x8.5 or 17X 8.5 or God knows!
I want 4 the same wheels with a overall size of 25X8-9"
They make this way to difficult!
The rim guys should send out template wheels of plastic or something so you can try it out before they ship $2500 in wheels across the country!

AND THEN THE BACK SPACING ISSUE!

Anybody solved the rim buying experience?

crazy4chevs · 06-04-2004, 03:01 PM

Ya, I know what you mean. I remember I saw somthing that would work for this but it was expensive. Think it was mount mate or somthing like that.
The dealers should have one at every store.

mcmlxix · 06-04-2004, 04:20 PM

http://www.rsracing.com/tech-wheel.html#backspace

crazy4chevs · 06-04-2004, 06:11 PM

Anyone know what that thing was called that you could mount a tire that you wanted to use on, then mount it to your rig then slide it around to check your fitment dimensions for your new wheels.

It was made out of aluminum and expandable from 13" to 20" wheels

went from a 6" rim width to 12"

and you could slide it in and out with the tire on it to get the offset and backspace right. It had all the measurements right on it.

I think i seen it in one of the Mags.

06-03-2004, 07:10 PM	#1
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	Need larger wheel size help!!! first off I have a ECE 4-6 drop on my 68 short fleet 2wd with disc brakes I was looking at 18x8 for the front. Come to find out they qiut making them in the 18x8" and now only offer it in the 18x9 with 5 1/2 BSM, will this work on the front? Is it to wide? (big)? The rear is a little differnt and so I just have a backspace Question. I wanted to use the 18x9 in the rear. My disc brake ford 9" is 1" wider than the 71-72 style rear and so I need to find out roughly what backspacing I should use any ideas? Here is the wheel Boss 304 Attached Images __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . Last edited by crazy4chevs; 06-04-2004 at 03:04 PM.

06-04-2004, 01:40 AM	#2
67shortie Green club Join Date: May 2002 Location: Central CA Posts: 1,059	To my knowledge the front backspacing should be about 1/2 of the rim size, so an 8 inch rim would have a 4 inch backspace to keep the loads off of the bearings. So, your front with a 9 inch should be approx 4.5 inches to keep it close. The rear, I have seen 5.5 inch backspacing on stock rearend withs with problems with frame interference, so most suggest a 4.5 backspace on a 9.5 inch rim. This is what I will be purchasing when the time comes to buy. But since your rear is one inch wider than stock, the 5.5 may just be right on the money or close to it. the only way I know of to properly do this is to either mount rims that are similar (width/backspacing) or use one of those nice wheel measuring devices (the actual name slips my mind) at a tire store or a borrowed one. __________________ 71 short/fleet ECE 4/6 drop, LQ4/700r4/3.42 gears 70 SS396 Chevelle 427/200-4R/3.73posi 61 Lincoln Continental, black on black Son you are going to drive me to drinkin if you don't stop drivin that hot rod lincoln

06-04-2004, 11:38 AM	#3
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	Great, Thats the kind of info im looking for. Anyone else?? , __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . Last edited by crazy4chevs; 06-04-2004 at 02:50 PM.

06-04-2004, 02:56 PM	#4
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	This is also driving me nuts! I have 24.5X9.5 " tires on my front right now and they don't rub! I have a 26X8" spare and that don't rub! I am going with the Weld velocity 6 rim but can't decide on the size! 18x8.5 or 17X 8.5 or God knows! I want 4 the same wheels with a overall size of 25X8-9" They make this way to difficult! The rim guys should send out template wheels of plastic or something so you can try it out before they ship $2500 in wheels across the country! AND THEN THE BACK SPACING ISSUE! Anybody solved the rim buying experience? __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

06-04-2004, 03:01 PM	#5
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	Ya, I know what you mean. I remember I saw somthing that would work for this but it was expensive. Think it was mount mate or somthing like that. The dealers should have one at every store. __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington .

06-04-2004, 04:20 PM	#6
mcmlxix Collector of Projects Join Date: Apr 2003 Location: Las Vegas Posts: 3,106	http://www.rsracing.com/tech-wheel.html#backspace __________________ Rich 1972 K5 Blazer CST Click HERE D60 BIG BRAKE UPGRADE Click HERE

06-04-2004, 06:11 PM	#7
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	Anyone know what that thing was called that you could mount a tire that you wanted to use on, then mount it to your rig then slide it around to check your fitment dimensions for your new wheels. It was made out of aluminum and expandable from 13" to 20" wheels went from a 6" rim width to 12" and you could slide it in and out with the tire on it to get the offset and backspace right. It had all the measurements right on it. I think i seen it in one of the Mags. __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . Last edited by crazy4chevs; 06-04-2004 at 06:14 PM.



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