Tyre size

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Originally Posted by letherm

Could you expand on this? What downside is there exactly? Not sure what you mean by "not as tight".

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As you change from 18 to 19 to 20 the feeling is sharper with better steering input and turn-in for cornering, however road bumps are more noticeable and the ride less comfortable. So it's not really upside/downside, rather there's factors that are more or less important depending on your usage.

Some of this is down to the tyre volume decreasing with larger wheels but of course some of it relates to the tyre itself. My experience with 19s is road tyres and with 20s Nittos (as a passenger). So I guess a better comparison would be say KO2s on both 18s and 20s to eliminate the difference a tyre makes. Russrobe's comparison between different tyre sizes in 18" suggests tyre volume plays a part but I'm not sure if there's tyre differences in his comparison too.

Hope that makes sense.

Cheers,
Scott

Quote:

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Originally Posted by LRD414

As you change from 18 to 19 to 20 the feeling is sharper with better steering input and turn-in for cornering, however road bumps are more noticeable and the ride less comfortable. So it's not really upside/downside, rather there's factors that are more or less important depending on your usage.

Some of this is down to the tyre volume decreasing with larger wheels but of course some of it relates to the tyre itself. My experience with 19s is road tyres and with 20s Nittos (as a passenger). So I guess a better comparison would be say KO2s on both 18s and 20s to eliminate the difference a tyre makes. Russrobe's comparison between different tyre sizes in 18" suggests tyre volume plays a part but I'm not sure if there's tyre differences in his comparison too.

Hope that makes sense.

Cheers,
Scott

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Thanks Scott.

That's helpful. Sounds like it's not a problem, more a slight softening of responsiveness if that makes sense. I ordered GOE rims to be able to get a more comfortable ride, even if it's marginal, for SWMBO who has a lot of health problems. I'm looking at 265/60/18 in Hankook ATM RF10's, Bridgestone Dueler A/T 697"s and possibly the Michelin LTX Force which has a "cushion guard" layer to minimise road vibrations/shocks (if you can believe the statement on their web site). Don't do any off road driving ATM unfortunately. [bigsad]

Thanks for your reply,
Martin

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Originally Posted by letherm

Thanks Scott.

That's helpful. Sounds like it's not a problem, more a slight softening of responsiveness if that makes sense. I ordered GOE rims to be able to get a more comfortable ride, even if it's marginal, for SWMBO who has a lot of health problems. I'm looking at 265/60/18 in Hankook ATM RF10's, Bridgestone Dueler A/T 697"s and possibly the Michelin LTX Force which has a "cushion guard" layer to minimise road vibrations/shocks (if you can believe the statement on their web site). Don't do any off road driving ATM unfortunately. [bigsad]

Thanks for your reply,
Martin

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A 'P' rated tyre will give a much more comfortable ride than an 'LT' rated tyre of the same size.

But if you want a robust tyre,you may have to go LT.

I would also experiment with pressures,as they affect ride comfort as well.

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Originally Posted by scarry

A 'P' rated tyre will give a much more comfortable ride than an 'LT' rated tyre of the same size.

But if you want a robust tyre,you may have to go LT.

I would also experiment with pressures,as they affect ride comfort as well.

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Thanks Paul.

I had a slight bump against a kerb going through one of those rotten calming devices and split the sidewall on a tyre with only about 5000km on it so was looking for a more robust tyre to avoid this type of problem. Lost confidence in H/T tyres because of that incident. I'll give the pressure change a go too.

Appreciate the advice.

Martin

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Originally Posted by LRD414

Russ, I have two friends with KO2s (both D4s); one on 265/65 and one on 285/60. These sizes are almost identical for diameter and both have rubbing at the front on the chassis protrusion and slightly on the liner. The rubbing is relatively mild and I’ve read other people mention the same thing in here, so I’m surprised you’ve got zero rubbing on the front.

Another thing to consider is how much the spare protrudes in 285, it noticeably reduces clearance at the back and I’ve seen it drag a lot more comparatively exiting steep gullies. Getting the spare up in place is quite difficult even when fully deflated for both 265/65 and 285/60 (I’ve helped with both).

These factors are not showstoppers but should be considered when choosing a size. I also wonder about increased load on CVs etc with the larger diameters. Obviously no way to quantify this but is something in the back of my mind.

Cheers,
Scott

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Tip is to add an extra .10 of a degree castor to keep the fronts off the chassis horn. I achieved zero rubbing by doing just this and still staying near on exactly within factory wheel alignment spec. Can near on guarantee whoever has 285 60 18s is either running precisely they correct castor or just under.

My 265 60s are passenger tyres for on road only and yet they're still much firmer than the 285 B stone 697LTs [emoji3] Same pressures of course. 38psi all round unloaded.


Definitely worth considering you'll want a RWC later, which will also lead to a long range tank, because everyone hates jerry's!