wheels and backspacing...

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kreiten

kreiten

Joined
May 6, 2013
Threads
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Location
UP Washington
So I love the look of the factory wheels but am considering a lift and larger tires and already have a bit of rubbing on the lower control arm in the front and the UCA with(275-75-R18). I don't really understand backspacing I guess and I believe the factory wheels are 8 inches wide??? So if I went with a wheel like this at 9 inches would that pull the tire out one inch from where the factory wheel has the tire sitting? I under stand there is more to where the tire sits than just wheel width i.e. wheel offset... here is the wheel I am looking at, thanks in advance... -Ken (backspacing on the aftermarket wheel I'm looking at is 5.75)
http://www.4wheelparts.com/Wheels/M...=11&t_s=535&t_pt=101508&t_pn=MRWMR30689058318
 
Can't help with your question but that wheel was one of my finalists before getting the TRD's. Nice looking.
 
codyaustin5 said:
Can't help with your question but that wheel was one of my finalists before getting the TRD's. Nice looking.
Click to expand...
I like the look of the TRD wheel a lot but does it have any more "offset" than the stock 18 inch wheel??? Guess my end game is to have the wheel/tire out one inch more than stock... Correct me if this thought process is wrong but if the stock wheel and the after market wheel both have the same offset and the after market wheel is one inch wider then the wheel with stick out half inch further due to being a 9 inch wheel as opposed to an 8 inch(factory wheel) If that's the case and I'm already having slight rubbing on my UCA and lower control arm that rubbing would get worse!?!? So I need more "negative" offset in my aftermarket wheel to pull it away from the suspension components?!?!
 
I'm not sure about backspacing but I'm sur oneof the tire gurus are going to pop outsoon and explain.
The "9" in 18x9 is how wide your wheel will be and that should depend on what tire you throw on. I had 17x7 on previously with tires that need a minimum of 7.5"-8"wide rims. What happened was i had the wheels continuously pop off the rim in the desert and by the 4th time i got sick of it and went straight out to swap the wheels.
 
codyaustin5 said:
Can't help with your question but that wheel was one of my finalists before getting the TRD's. Nice looking.
Click to expand...
are the TRD wheels 8 inches wide just like the factory wheel?
 
Desert Nomad said:
I'm not sure about backspacing but I'm sur oneof the tire gurus are going to pop outsoon and explain.
The "9" in 18x9 is how wide your wheel will be and that should depend on what tire you throw on. I had 17x7 on previously with tires that need a minimum of 7.5"-8"wide rims. What happened was i had the wheels continuously pop off the rim in the desert and by the 4th time i got sick of it and went straight out to swap the wheels.
Click to expand...
I would be running a 285mm wide tire if I go to a 9 inch wheel, which I believe should be perfect for that wheel width?!?!
 
I think the trds are 17x8 but with more offset to stick the tire out.
Regarding the 9" wheel and stock offset i have no idea it means it would be 1/2" wider at both ends or (more likely) stock offset means it'll sit in the same area on the inside of the wheel well and stick out 1" further on the outside. I think it was aMir904 who had a thread before of offsets and proper tire pressure for different tire sizes. An easy fix would be to put spacers on to clear the uca
 
Desert Nomad said:
I think the trds are 17x8 but with more offset to stick the tire out.
Regarding the 9" wheel and stock offset i have no idea it means it would be 1/2" wider at both ends or (more likely) stock offset means it'll sit in the same area on the inside of the wheel well and stick out 1" further on the outside. I think it was aMir904 who had a thread before of offsets and proper tire pressure for different tire sizes. An easy fix would be to put spacers on to clear the uca
Click to expand...
yeah, if the backspacing is the same then I believe you are correct that it would stick out one inch further if it were a 9 inch as opposed to the factory 8 inch, I was saying if they both had the same offset then I believe it would just be a half inch(the one inch would be split between the front and back of the wheel) Spacers are something I have defiantly considered but a lot of the tire shops I deal with here in town will not touch my truck if I have spacers on it, so I was trying to just go the new wheel route.... Any one know why wheel and tire shops have such a negative view of wheel spacers? I realize it's proly got a lot to do with liability etc?!?!
 
From all the horror stories I've read on wheel spacers most the time they either aren't torqued up to spec or depending on manufacturer some need to be re-tourqed every x amount of miles 2-3 times until they settle in. I bought h&r spacers for their quality i wasn't trusting the fake stuff they sell out the tire shops here
 
Factory rims are 203.2mm with +60mm offset. The outside of the rim is therefore 41.5mm ((203.2mm/2) - 60mm) from the mounting point on the hub. The Methods you like are 228.6mm wide with +18mm offset - i.e the outside of the rim will be 96.3mm from the hub mounting surface. That means if you fit these your new wheels and tires will stick out 54.8mm per side more than your stock rims currently do. Zero offset is where the rim mounts to wheel hub in dead centre of wheel. +ve offset means this mounting point moves to the outside of the rim. -ve mean the reverse. My experience has been that anything less than +30 on an 8" wheel will see the tire finish outside the fender line.
 
Last edited:
Billfish said:
Factory rims are 203.2mm with +60mm offset. The outside of the rim is therefore 41.5mm ((203.2mm/2) - 60mm) from the mounting point on the hub. The Methods you like are 228.6mm wide with +18mm offset - i.e the outside of the rim will be 96.3mm from the hub mounting surface. That means if you fit these your new wheels and tires will stick out 54.8mm per side more than your stock rims currently do. Zero offset is where the rim mounts to wheel hub in dead centre of wheel. +ve offset means this mounting point moves to the outside of the rim. -ve mean the reverse. My experience has been that anything less than +30 on an 8" wheel will see the tire finish outside the fender line.
Click to expand...
thanks for info Billfish, that's what I wanted to know!!!!!:cheers:
 
The quick answer is: 60mm - 18mm = 42mm. Your tires will stick out ~42mm more than before.

Whether it is an 8" or 9" wide wheel, the tire will center on it. And in both these cases, the tire is wider than the wheel. There is a small change in the tire section width when going from an 8 to 9" wheel... probably something like 1/4" though.
 
Last edited:
hoser said:
The quick answer is: 60mm - 18mm = 42mm. Your tires will stick out ~42mm more than before.

Whether it is an 8" or 9" wide wheel, the tire will center on it. And in both these cases, the tire is wider than the wheel. There is a small change in the tire section width when going from an 8 to 9" wheel... probably something like 1/4" total though.
Click to expand...
perfect, ok so it would pull the tire away from the UCA and LCA etc 42mm due to the new wheel, but then because the wheel is 9 inches as opposed to 8 inches the tire width will be pulled wider by roughly a 1/4 inch, or 6 or 7mm... So effectivley increasing my clearance at the UCA and LCA by 35mm- ish.... I think I understand it now, that's over an inch of extra clearance, pleanty... And proly about the exact same as if I went with some 1.25 inch wheel spacers.... thanks for the info!
 
wow some cool rigs on there, wish they gave more info, tire size, lift etc.. I didn't see that on there... I'm assuming they are running the ICON's:)))
 
hoser said:
The quick answer is: 60mm - 18mm = 42mm. Your tires will stick out ~42mm more than before.

Whether it is an 8" or 9" wide wheel, the tire will center on it. And in both these cases, the tire is wider than the wheel. There is a small change in the tire section width when going from an 8 to 9" wheel... probably something like 1/4" though.
Click to expand...
would you happen to also know if the TRD wheels would pull the wheel/tire away from the UCA and LCA? And is so how much? thanks
 
Yes, wheel clearance increased by roughly 10mm.
60mm (OE) - 50mm (TRD) = 10mm

But we are talking about 18x8 vs 17x8, so it's a bit more complicated than that. Exact tire clearance will depend on the tires.

In your 1st post, you are talking about rubbing on the LCA... but I suspect you mean the KDSS sway bar/mount. SLEE has something up his sleeve regarding relocating the KDSS slightly for more clearance. I'd contact him.

For rubbing on the UCA. An aftermarket UCA can give you more clearance... and suggested for higher lifts.
 
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