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305/65/17

14K views 35 replies 9 participants last post by  Mach40 
#1 ·
Has anyone tried to put a 305/65/17 on a stock Pro4X wheel with a 3" lift? Do they rub? I know the tire measures 32.8" High and the section width is 12.5" but Q is will they rub?
 
#2 ·
A 285 tire on a stock rim will rub the frame when at full turn so a 305 on a stock rim will rub sooner.
 
#3 ·
But a 285/70/17 is taller than a 305/65/17. How much of a offset would I need to clear it compared to the stock wheel or can I throw in a set of spacers?
 
#4 · (Edited)
I put 305/70 on stock 16s on my truck with a 5" lift and it still rubbed. Mud flaps came off...still rubbed, trimmed the fenders and it still rubbed on the passenger side at full lock. I'm not sure if you can fit a 305 with out a wheel adapter in the front. Mine looks like if I took the 1.5" adapter off, the tire would rub on the spindle (looks like it would, not sure if it actually would though but it would be extremely close).
 
#5 ·
I am thinking the same if I get a wheel spacer with a 1.5" thickness or a wheel with 1.5" less backspacing I could fit them
 
#6 · (Edited)
I'm not exactly sure how to explain this but if you have rims with a lot of offset or if you add spacers/adapters that will actually make the tires rub worse. Especially on the rear of the fender wells. I had some issues with my rims clearing my caliper mounting bracket, so I had to get some custom made 1.25" adapters to stick them out some. Now, I have 4" of lift in the front and with the 1.25" adapters and the big offset on my pro comp rims I couldn't even clear a 265/75R16. I had to do some major trimming and melting of plastic. And it still rubs a little at full crank and a little compression of the front suspension.

So basically when you stick the tires out further they rub more. Im just not sure how to explain it in a technical manner right now. Hope this helps.
 
#8 ·
I have 305/70R16 tires mounted on American Outlaw Colt wheels. No spacers.
 
#12 · (Edited)
305 is a little wide on the stock 7 inch wide rims...



Mike's clear because he has wider rims and they have some serious offset ( and look amazing of course)
 
#10 ·
The quoted post is a little mis-leading. To use the 1" spacer, you will need longer studs. If you try and use a 1" adapter, you won't be able to fit the rims since the oem lugs are just over 1.25" long.

I have another question thou, are you trying to put those wheels on stock rims? Doesn't the Pro have 16s?

Lastly, just remember when you increase the size of the tire, you are adding weight and most likely diameter so you may need to look into gearing to correct for this but its not an easy thing on the 2nd gens.
 
#11 ·
Very true. Exactly why my adapters are 1.25". Just enough to clear.
 
#13 ·
according to Fabtech with there 6" lift you can clear a 315/70/17 tire on a 17x8 wheel with a 5" backspacing with minor trimming
 
#14 ·
I have to ask, how does this help?

As you may have noticed by the responses that it is hard to tell until you pick the rim and tire and then what your final lift will be. Our truck have a wacky bolt pattern (6x4.5) so it is hard to find rims that fit. Then when you find the bolt pattern, the offset and backspacing are wacky. This is why there are so many clearance issues on the front end.

Then on top of all of this, a lot of guys have decided to go the Tswap way so its even different for them.

When it boils down to it thou, you may think a spacer will help but in all honesty, the spacer only allows the inner side of the tire to impact the fenders quicker.

Lastly, I know you want to go wider, but you have to look at the safety limits of the rims width. A 285 will fit on an 16" oem rim but its not recommended but a 305 or 315 is just insane. It has been done but I would not recommend it unless you have aftermarket rims that are wide enough.

Lastly, don't forget about gearing since wider tires are also heavier and possibly taller so your overall ratio will suffer and your truck will be a dog off the line and a pig at the pump.
 
#18 ·
According to Fabtech and calmini the best sized wheel for the truck is a 17x8 with a 5" backspacing with 4" of lift you should be able to clear a 305/65/17 and with 6" of lift a 315/70/17 . I just don't know anyone who has done it. I know you can get a 17x9 KMC Addict with a 5" backspacing but I don't know anyone who has them on there truck with that big of a tire.
 
#20 ·
let me ask you this if I put a 17x9 wheel on the truck with a 5" backspacing with a 6" lift I should be able to clear a 35x 12.5" tire, correct? Doughboys done it?
 
#23 · (Edited)
I am sure there are some available, they are a standard size but I have not seen any saying specifically for our trucks. Based on what I have for studs on my truck I know I can use a 1" spacer and talked to Fred Goeske and he said 1" will work but it is close.



I am at 6" with 5.25 BS on a 17 x 8.5 295/70-17 and still rub slightly, I think you may need 6" suspension and maybe BL. Just Saying
 
#22 ·
no but do you know any company that sells hardened studs for this truck?
 
#24 ·
Has anyone checked out the Xd series addict in 17"? do they come with a 5" backspacing does anyone know?
 
#26 ·
Did I miss something or isnt 305/65/17 a 32.6" diameter (eg. 33")
Will fit Stock Height in the rear and with a 2" lift up front with incidental rubbing.
May require removal of front mud flaps and air dam.
 
#30 · (Edited)
See now that looks good with a small tire but it would rub everywhere with a 35x 12.5

I know exactly what you are saying but if you have a 17x9" wheel with 5" backspacing that seems to be the best setup cause you can clear a 35" tire with a six inch lift with no problem. And you could go to a 35 x 12.5 but you have to do some trimming
 
#31 ·
A 17 x 9 wheel with 5" backspacing is still going to push the wheel about 2" further out than factory not including the width of the tire, I am not even that far and still just about rub with a 6" lift and 33's with more than 5" of backspace. Htown's truck running the 35's has 8" of lift just for example and have no clue what his wheels specs are.

I am not saying it cant be done and it has but with more work than some care to do, especially cutting fenders or bumpers
 
#32 ·
I understand that but where is he rubbing on the inner fenderwell or on the outer. you have to push the wheel out in order to clear the tire but when you do that you will rub on the outer. so you have to pic the lesser of two evils. You are better off trimming a little off the inner fenderwell than the tire rubbing on the frame where you can do anything.
 
#33 ·
The further out from stock you push the tire will increase the chances of rubbing the tire on the actual fender right at the bottom where the mudflaps would be, pushing the wheel however will stop the tire from hitting the frame and the spindle but then you have to deal with the fender and the bumper at that point, don't care about the plastic inner fender liner cause that can be manipulated to where it needs to be, it is the metal fender that you would need to trim that some people wouldn't want to do. the other thing to be concerned with is the amount of power that you lose with the bigger tires and the fact that your economy will drop immensely. I have LT295/70-17 on mine and was averaging 14 mpg, I do a lot of highway driving and the truck downshifts constantly trying to keep up with the cruise. It is a truck, I modded it, I will live with it! With 35's it will just be worse.

I guess the big question is... are you ready to lift 8" to maybe clear and are you willing to cut your fenders if not??? Next Q would be is it a DD and are you willing to have much less power and terrible gas mileage?
 
#34 ·
Cutting the fender is not a big deal. You just have to put your purse down and cut about an inch of the bottom.
 
#36 ·
Thank you! I am glad somebody said it!! LOL Mike what do you think 35 x 12.5 on a 17x9 with a 5" backspacing you think I will rub the frame on full lock
 
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