Ademuth Posted February 25, 2014 Report Share Posted February 25, 2014 im looking to buy a set of new 16" steelies and am wondering if they will fit my 620. the measurements are offset 0 backspace 4.5" rim width 8"and 16 rim and i plan on lowering the truck with 4" blocks and putting on 205/50r16 tires on. Will any of this rub when i lower it? Quote Link to comment
Tristin Posted February 25, 2014 Report Share Posted February 25, 2014 I cant help with anything fitting since I know jack about 620s, but a +0 rim and 4.5in of backspacing would make the rim 9J and not 8J. +0 means that the hub face is directly in the center of the rim width. If there is 4.5 behind the hub, then there is 4.5 in front of the hub. 4.5+4.5 = 9. Good luck on the hunt for the info. Im sure one of the many 620 guys will be in here soon. Quote Link to comment
ggzilla Posted February 25, 2014 Report Share Posted February 25, 2014 An 8J (8") rim is close to 9" overall width. So offset 0, backspace 4.5" makes it an 8" rim. Quote Link to comment
Cpl620 Posted February 25, 2014 Report Share Posted February 25, 2014 Thats what she said... I think you should be fine. Maybe a 195. I was running a 15x10 with 225x60 and only rubbed a little on the back part of the well with a 4" drop. The rear was fine. Quote Link to comment
Ademuth Posted February 25, 2014 Author Report Share Posted February 25, 2014 alright thanks im going to order them tonight then, i work at a place that puts on tires so ill see if my manager will let me test fit them with the 205/50's before i buy them Quote Link to comment
ggzilla Posted February 25, 2014 Report Share Posted February 25, 2014 Isn't that offset too little? Quote Link to comment
Tristin Posted February 25, 2014 Report Share Posted February 25, 2014 An 8J (8") rim is close to 9" overall width. So offset 0, backspace 4.5" makes it an 8" rim. You shouldnt be measuring the edges like that though. Oh well, whatever... OPs question was answered; thats whats important. Quote Link to comment
ggzilla Posted February 25, 2014 Report Share Posted February 25, 2014 Backspace is measured to the edges. Quote Link to comment
KlassicMotion Posted February 25, 2014 Report Share Posted February 25, 2014 It also depends on what year your tuck is. '72 and '73 have a more narrow track. I had to buy 1" spacers to run stock Chevy 16x7 steelies that have 4 7/8" backspacing. I'm also currently running 215/60/16 on a stock ride height. Without the spacers, the fronts rubbed when turning, and the rears wouldn't even mount to the hub. Quote Link to comment
Ademuth Posted February 25, 2014 Author Report Share Posted February 25, 2014 its a 76 Quote Link to comment
Dime Dave Posted February 25, 2014 Report Share Posted February 25, 2014 Just as a reference the 15x8 Chevy Rally steels are a -12 offset. Quote Link to comment
Dime Dave Posted February 25, 2014 Report Share Posted February 25, 2014 Backspace is from the very inner edge to the wheel mounting surface (WMS). negative (-) offset wheels have the WMS inboard of the wheel centerline. positive (+) offset wheels have the WMS outward of the wheel centerline. The diagram below shows a negative (-) offset wheel. Quote Link to comment
Ademuth Posted February 25, 2014 Author Report Share Posted February 25, 2014 so I changed my mind on the steelies I found other rims that are 16x8 with a -10 or 0 offset which would fit better after I lower it 4" Quote Link to comment
ggzilla Posted February 26, 2014 Report Share Posted February 26, 2014 Either one will work with spacers. Quote Link to comment
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