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Discussion Starter · #1 ·
First off before anyone jumps on me I have done searches for the exact thing I am asking about but could not fine the answers I was truly looking for.

I have a set of 20x9.5 inch rims, (2) of those rims have BFG's 295 40 ZR20 tires on them (brand new), unfortunately those tires have been on back order for approximately 6 months. My question is what other size tire could i run on the rear of the truck? I have also read on some threads that if you go to a 315 35 20 or 305 35 20 it could cause issues with the computer in the truck but not sure how accurate that is. Also, I would like to get the same type of tire on all (4) corners but if that comes to be impossible I guess I will have to have (2) different brands. This is also a daily driver as well so no drag radials will work for me.

Any help would be appreciated!
 

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295 40 is probably the preferable size but I used to run 295 45 on that same size wheel without a problem. Pretty heavy for sure and some people dont like that tall of a tire on 20s. I used it as a daily driver too and I had no issues
 

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FOr me the most important thing used to be keeping the diameter close to stock, but with programmers now it's not as important except for the performance aspect w/ gear ratio...

After that the only other things to consider are drop and availability in a particular brand, etc.
 

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Discussion Starter · #6 ·
It has a Hotchkis TVS kit on it so it is dropped, I just realized that they have 295 45 20's in the BFG do not know if that is close to stock but would think it is since the stockers are 295 45 18's. Like I said earlier i would go with the 295 40 20's if they were not on back order.

I would assume the 275 are skinnier so would that not fill up the wheel well from outside to inside? Just curious as you can tell I am a novice when it comes to things like this!
 

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a 295/45r20 is literally 2" bigger than a 295/45r18

you can play around with this to find a size
http://www.miata.net/garage/tirecalc.html

a 315/35r20 would be a close match, but I don't know if anyone makes that size. and if they did it would probably be very expensive

a 275/40r20 would be another close match, but now you are almost a full inch narrower, so less traction.

295/40r20 is 0.8" taller, but you keep the width.
285/40r20 is only 0.5" taller than stock, approx 0.5" narrower.

Go find the tire(s) you like and look at the available sizes. Then plug it into the calculator.
Another thing to consider is the ACTUAL diamater and treadwidth is going to vary from tire manufacturer to manufacturer. So a 295/40 might be 29.1" tall with brand x, and 28.8" tall with brand z
 

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GoD GiVeN
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It has a Hotchkis TVS kit on it so it is dropped, I just realized that they have 295 45 20's in the BFG do not know if that is close to stock but would think it is since the stockers are 295 45 18's. Like I said earlier i would go with the 295 40 20's if they were not on back order.
I was wanting to go with 295 40 20s also, but i am in the same boat as you, so i might just go with the 295 45 20 BFGs, since that is what i have ran for the past few years in Hankooks

-Adam
 

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Panty Dropper
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I had 315/35's and 275/40's on my truck up until today, they looked a little short to me, so I went 295/40 and 265/45 toyo proxes st2's. Tires/wheels being balanced now, so I'll take some pics when I can.
 

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I am running 20x9.5 front and 20x11 rear with 275/40-20 and 315/35-20, they are both the absolute closest size to the stock 295/45-18.

275/40-20 is PLENTY of tire for the street.

I run the Michelin Diamaris tires that are spec'd for the BMW X5 4.8is, they are plenty grippy.
 
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