275/60R20 & chains - Nissan Titan Forum
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#1 (permalink) Old 12-17-2011, 01:54 AM
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275/60R20 & chains

Ok so I've done some searching and read some threads including "Tire Chains 101". Had a look at tirechains.com and their info. But there's something I don't quite get.
In the owners manual for the 2010 it specifically tells us that we can't run chains with the 20" wheel & 275/60R20 tires. It advises that for chains you should have 18' wheels & 265/70R18. So I checked and there's less than a half inch difference in both Overall Diameter & Section Width.
So how do 265/70R18 magically make it OK to chain up?

Thanks,
D
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#2 (permalink) Old 12-17-2011, 05:47 AM
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Re: 275/60R20 & chains

What do you need chains for?
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#3 (permalink) Old 12-17-2011, 08:46 AM
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Re: 275/60R20 & chains

When I bought my truck I had to sign a supplemental paper that said if I used chains it would void my warranty & I have 18's.. I just can't remember if it was a California thing or Nissan thing.

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#4 (permalink) Old 12-17-2011, 10:42 PM
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Re: 275/60R20 & chains

Quote:
Originally Posted by timmy_g83 View Post
What do you need chains for?
1) required to carry over some OR passes when conditions are bad enough

2) to actually be able to drive when conditions are that bad

A separate set of studded snows is an option, but a very expensive one.

I just don't get why the manual would say it's OK for 18" wheels but not 20" wheels when the overall outside diameter of the tire barely changes.

- D
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#5 (permalink) Old 12-18-2011, 04:11 AM
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Re: 275/60R20 & chains

Just giving you sh#t. I was in WA state and know that the passes can get crappy out that way. I'd just find a set of traction tires and a different set of rims for the winter. Save you some hassle and make it easy to swap out.
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#6 (permalink) Old 12-18-2011, 04:41 AM
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Re: 275/60R20 & chains

Most people have seen issues with the chains rubbing on the spindle, not on the wheel well. That is why the rim diameter makes a difference (obviously running too large of a tire does as well). The 20" rim probably puts the spot where the chains mount closer to the spindle and that causes rubbing when the chains twist. So if you have to change rims anyway, I would get a set of studded MTs if you plan on doing serious winter offroad driving. I got my 33" x12.50" trail diggers for $230 per tire, and they have factory stud-mounting locations. I believe the firestone destination MTs also are made for studs.


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#7 (permalink) Old 12-18-2011, 10:25 AM
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Re: 275/60R20 & chains

Thanks guys, I'll have to pass on the suggestion. I've seen some stock 18s for sale that would be great for a 2nd set of snows, but all said it'd still be well over $1K.
My folks got the truck after totaling their Sierra on a black ice slide & roll. So budget is tight after an unexpected truck purchase & right at Christmas. But given the lesson the black ice slide should teach...
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#8 (permalink) Old 12-18-2011, 08:46 PM
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Re: 275/60R20 & chains

In my "Tire Chains 101" I postulated that the proximity of the spindle may be why Nissan says chains on the front are a no-no - even with 17" rims. One of these days I'm going to try my chains on the front just to see what happens. But I need some snow first.

When I grew up in Wyoming we chained up all four tires. But this is back when there was no such thing as electronic transfer cases or trucks with small wheel wells.

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#9 (permalink) Old 12-19-2011, 12:02 PM
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Re: 275/60R20 & chains

Here is my recent discovery with chains. I couldn't bring myself to buy a set of those class "S" chains for my titan. So I went with heavy duty twisted link from tirechains.com on my 2011 pro4x. I have the stock 275/70r18's and they fit fine with a dry test. I am running heavy duty vbar on the rear with quite a bit of clearance. Didn't get the chance to run them hunting this year, but most likely will next week up in the mountains.

My tires are almost the exact same dimensions as those 20's, the difference will be how far the chains come down the sidewall. My chains hit at the widest part of the sidewall and I have a little less than 1/2" inch of clearance to the spindle. I would imagine that 20" tires would actually have a narrower sidewall (random tire choice showed .1" less-maybe more with a stiffer sidewall tire), giving a little extra clearance. Someone else on here used those class "s" chains and broke both very quickly off road.

If you go with the heavy duty ones, ask them how wide the chains are compared to the ones that fit 275/70r18's. If they are more narrow, that will also give more clearance as the spindle gets closer to the tire the further down it goes (closer to wheel). Also make sure and get ones with cams to help tighten the chains towards the outside of the tire.

Worst case, you can go class "s" up front and heavy duty out back.
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