Another Tyre Thread - width considerations for on road driving with MT tyres - Defender Source
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Old February 13th, 2016, 03:22 AM
agentmulder
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Another Tyre Thread - width considerations for on road driving with MT tyres

Hello all,

Due to a stupid fitment on a Defender new to me (225/75!) I'm getting a new set of tyres.

Although I do most of my driving on road, when I do go off I've really appreciated the extra grip the current (but small) MT tyre affords compared to an AT. I've only once lost grip on road in the wet with my current set, I'm ok with that and I cant rule out an AT wouldn't have been any better anyway. I'm also aware of the reduced longevity of an MT and are OK with that.

So... I'm sold on the BF Goodrich Mud-Terrain T/A KM2:



My query pertains to width:

235/85 vs. 265/75 - which are virtual equivalents in terms of diameter...

I'm leaning towards the standard 235 - mainly because of the (untested) theory that I prescribe to that a thinner tyre 'cuts' through mud to more solid ground compared to a wide. Also reduced cost per unit, and the less mass involved to get up to speed.

I'm not sold on the width in terms of aesthetics, but I suspect if I could compare I'd likely opt for the classic thinner look.

The actual question:

I'm interested in hearing your thoughts about what width would be best for the on road component of my driving?
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  #2  
Old February 13th, 2016, 04:45 AM
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In my opinion go for the 235. This is easier even for the steering gear to handle on slow speeds and parking manoeuvres. But still as i said, this is me!
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Old February 13th, 2016, 05:14 AM
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what a lot of people run are 255/85 and they seem fairly easy to find that size.

I put 13k miles on a set of KM2s 255/85 this summer. They ate up the highway miles just fine and got me through sand, thick mud, and snow easily enough!
I have set of KM1s 255/85 on the 110 and they feel great on it, in terms of turning and road manners
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Old February 13th, 2016, 08:26 AM
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I had both 235 and 255 on my d when I had it. Both worked great. I liked the slight height advantage of the 255 and they looked a little more appropriate ( to me).

You'll need a little lift for the 255, not sure about the 235.

Honestly very littler difference if any in drive ability between the two
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Old February 13th, 2016, 08:52 AM
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I would imagine "best" overall road maintenance would be from a stock height truck with 235's. I have 255's on a nas SW with 2 inches of lift and no sways so I can't remember what road maintenance is. My 110 is all stock with 235's and all around much more civil. IMO the 255's will provide a benefit off road if you drive hard but probably not noticeable if you are a take my time approach. My 110 has performed better than expected off road with stock config.and a nice change/challenge.
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Old February 13th, 2016, 09:15 AM
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265s drive better on and off road of those two choices.

You do not need a lift for a 255 if you went that way.
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Old February 13th, 2016, 09:36 AM
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the spring thread has a photo of Jack 90 SW on HD Rover springs and 235's, it looks really good. I have been pleased with my 255's, the truck isnt as speedy up hills as with 265's.
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Old February 13th, 2016, 10:09 AM
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Just installed mine with 235/85 at
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Old February 13th, 2016, 02:26 PM
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Quote:
Originally Posted by Red90 View Post
265s drive better on and off road of those two choices. You do not need a lift for a 255 if you went that way.
To get the most out of them I would say you do. Otherwise you'll need larger bumper stops to avoid rubbing not under full compression
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Old February 13th, 2016, 02:30 PM
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Not with 255 or 285. Any larger and you want 1" longer bump stops in the rear. You add 2" lower shock mount to get the travel back.

This needs to be done regardless of whether there is a lift or not. Spring lifts do not affect wheel travel or tire clearance.
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Old February 13th, 2016, 02:46 PM
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Quote:
Originally Posted by Red90 View Post
Not with 255 or 285. Any larger and you want 1" longer bump stops in the rear. You add 2" lower shock mount to get the travel back. This needs to be done regardless of whether there is a lift or not. Spring lifts do not affect wheel travel or tire clearance.
well I had a 2" spring lift and under full compression my rears would rub a little (255's). Couldn't imagine how it wouldn't be worse with stock spring height.
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Old February 13th, 2016, 09:43 PM
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Thanks for all the comments, looks like any option is fine with no major dramas on the road to look forward to.

One aspect that I didn't consider with respect to any of the options - but especially relevant to the 255 - was that all the indoor parking lots I currently use with my 225/75 might need a recheck before I wedge myself into a sprinkler head...

I think I'll go for the 235's - they are cheaper by more than the ratio of extra rubber :D
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Old March 31st, 2016, 01:36 AM
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Final update:

235's are going great
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