blackwolf wrote:

As stated above, wheel spacers won't affect your wheelbearings any more or any less than wheels with an equivalent changed offset. It is just another of those urban legends that they will.

Unless you opt for a very thick spacer or hugely different offset wheel, the increased loadings on the suspension components should be negligible.

The only aspect of the steering geometry that will be affected is the 'scrub radius', which is a function of the steering axis inclination and camber angle. The scrub radius is the distance between the point at which a line drawn through the centres of the top and bottom swivel pins instersects with the ground, and the line along which a plane through the rotational centre of the tyre intersects with the ground (which is generally outboard of the steering axis interstection point).

The scrub radius will increase if the tyre is moved outwards, either by use of a spacer or by use of a wheel with reduced (ie "more negative") offset. However, the scrub radius will decrease is a larger diameter tyre is fitted without changing the offset, since the act of raising the axle further from the ground will move the intersection point of the steering axis and ground plane outwards. Fitting a wider tyre of the same diameter to a wheel of the same offset won't affect the scrub radius at all, since the increase in tyre with is shared equally on either side of the rim.

The result of this is that fitting spacers and larger tyres will actually affect the steering geometry less than fitting spacers without fitting larger tyres.

The effect of increasing the scrub radius is that the vehicle will be more affected by changes and irregularities in the road surface; for eample, it may be more prone to 'tramlining' in lorry-ruts on motorways, more prone to a wobble when crossing white lines; that sort of thing. When I bought my 07 DC it had 285/75s already fitted on standard Boosts without spacers, and I fitted 30mm spacers as soon as I reasonably could (principally because the turning circle was unbelievable!). I found that the steering performance and handling improved afterwards.

One thing to bear in mind with spacers, especially thin ones, is that the hub/wheel interface may not be as strong as before, and this is probably the area of most concern (and the reason why spacers are not allowed in motorsport). For the spacer to work, the spacer must be bolted to the original wheelstuds and the the wheel bolted to studs fixed in the spacer. Therefore (a) the spacer must be of adequate strength/thickness to mount the new studs securely, and (b) the spacer must be think enough to accomodate the full length of the original wheel-studs AND the thickness of the nuts holding it to the original studs within the thickness of the spacer. With thin spacers, there is relatively little material left to secure the spacer after it has been counterbored to accomodate the nut. I don't believe that any reputable manufacturer makes spacers for LRs which are less than 30mm, and this is the reason.

There is no reason why any of the nuts should ever come loose. There is another urban legend that says the nuts should be threadlocked, but this is not a good idea. If the threads are kept clean with just a hint of copper-grease, and the nuts are torqued correctly, the nuts will not loosen.

Many insurance companies will frown upon the use of spacers and it is not clear why. It may be that they are too ignorant to understand them fully, or more likely they have stats whcih show that cars with spacers fitted are more likely to be involved in accidents than those without, which is probably true in the case of the Corsa-Kiddies but not 4WDs. A specialist insurer should be OK with them.

Cupboard wrote:

Suspension lift, particularly if done badly, will significantly affect the handling. Obviously you're raising the centre of gravity and also changing the steering geometry.

Whatever you do, if you're using Special Tracks the handling is going to be pretty awful, I've got a friend with them and you can hear him coming from miles off too. What are you actually going to be using the vehicle for? If it's just a quarry basher then great but I'd think twice before putting them on a general purpose Land Rover.

Another tyre size that might be worth considering is 255/85R16 which is the same height as the 285s but a bit narrower. That's about a 33" tall, 10" wide tyre. BFG, Maxxis and a few others do mud tyres that size that will all be more manageable on the road than Insa Turbos. Again the narrower ones might look silly in large arches though.

blackwolf wrote:

You might want to have a read of the quote below, taken from a discussion on wheel spacers (http://www.defender2.net/forum/topic9013.html). Whilst it is about spacers, it does shed some light on the intricacies of steering geometery.

Bear in mind that all spacers do, geometrically speaking, is change the offset.

285s do and will feel different to 265s, but probably not hugely different. Generally fitting wider tyres, or otherwise altering the scrub radius, will make the vehicle more "skittish", prone to "tramlining", and suceptible to other road-surface-defect-induced odd behaviours.

blackwolf wrote:

"more affected by changes and irregularities in the road surface; for eample, it may be more prone to 'tramlining' in lorry-ruts on motorways, more prone to a wobble when crossing white lines"

It pulls the steering with force quicker than I can react and sometimes on breaking.

I have changed wheel bearings, track rod ends, drag rod ends, new drag bar and steering bar and re-tracked it.

Not changed front radius arm bushes.

50-60mph is fine. Low speed is awful.

Would be nice if I could try many combinations before buying!

Thnaks for your advice, much appreciated.

Bps wrote:

I have had issues with handling with tyres on a 10" rim and big offset. Going to a 8" rim and less offset cured all issues. Personally I wouldn't ever drive on the road on insa turbos ever. Noise, handling and wet grip were horrendous.

Bps wrote:

They were either 265 or 285 I can't remember as it was a few years back. Bias ply are not the best on the road. Are you runnning mudzillas or Treps? I'm on 35" km2's.

They are Maxis Mudzillas. Seem great off road, today & yesterday I done a track nearby very sticky and big ruts and just went through in 2nd..no wheel spinning..just drove through...thats why I really like them! I hate changing wheels about though so want one wheel/tyre for all!


KM2's look nice. The Mudzillas have nice sidewall tread blocks too! Handy when its tilting over in ruts