Has anyone fitted 295 40 22's on their L405's yet please?

They are a new size offered by Conti for the SVR L405. Seems like an ideal upgrade from the 275 40 22's factory size...

No, I was going to change to the 285/40/22 when the time came. I have done all the calculations and the current 275/40/22 are slightly undersize when compared to the 255/55/20. Which in real terms means that the 275/22 vehicles are slightly lower geared which = more acceleration, but slightly lower mpg and lower top speed.

I will have a look at the 295’s as I wasn’t aware of them 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

Wider tyres provide more unsprung weight (always the enemy of suspension), more rolling resistance, an increased possibility of aqua planning, a possibility of fowling at full lock, more tyre noise and often, a greater tendency to tramline. Wider tyres, on their own, tend not to increase grip on tarmac; they spread the load of the car over a greater contact patch, reducing the down pressure (and therefore grip) per unit of contact area.

I once had a police accident investigator illustrate this last point to me by getting me to push an empty beer glass across the table with a single finger; he then turned it upside down so that it was balanced on its rim only. Guess what, it took exactly the same effort to ouch it across the table!

I may have missed an important point here. In what ways would you consider ever wider tyres to be an “upgrade”?

Your argument/ point of view does hold water, however , 'upgrade ' could include cosmetic , which to many is reason enough. As to your practical points , these may be the case in a switch from 155 width tyres to 345 diameter but on the sizes discussed here the incremental differance would not really make any difference. Just my humble opinion. 2015 4.4 AB
GSXR 1000 K5
R1 1998

If wide tyres don’t help with road holding or getting power down on the road, and you get better grip with a narrower tyre - then why don’t Formula one cars run on bike tyres if wider are no good ? 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

Because the car is designed for a completely different purpose and the whole drive train and suspension system is designed around handling a great deal more power and is tuned to work with tyres of that width and weight. If they were to put that much power through a standard width road tyre then they would never be able to run the softer compounds that they need without the tyre running very hot and disintegrating - which is not normally a problem for a road car.

Simply putting oversized tyres on a car who’s suspension was never designed to take them means that the car is highly unlikely to benefit from them, but it may easily suffer from the bigger tyre’s disadvantages.

Sorry, despite the strength of the argument I still don't buy it - simply based on what all manufacturers have always done there has to be more upside to wider tyres that none of us here seem to be able to articulate. I do get that some of it is purely marketing/design, but any faster version of any car (regardless of negligible suspension revision) has always been marketed with wider tyres than the less "sporty" version. At some point enough people believed that wider tyres would make a car better that it became an unquestioned "upgrade" ... and now you are arguing its always been a nonsense. I'd like to hear the counter from a design engineer as to why its always been done. Ready to be surprised that it was just an aesthetic.... Mike - MPx

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The point of me asking in the first place was, the larger width will add to rim protection...

Dependant on which model you choose, the tyre width jumps between 255mm & 275mm so the argument that adding 20mm to the width of the tyres has already been disproven by JLR offering both 255mm & 275mm on EXACTLY the same model & spec!

Fwiw, my main agent had several new MY18 Range Rovers and RRS on 285/40/22 in the showroom and on the forecourt. It maybe worthwhile having a look at the LR Configerator to see if this size is now std on 22” wheels or an option, or was it simply down to a short supply of 275 tyres or a good deal by the tyre manufacturer.

If LR are fitting slightly wider now, hence my thoughts re changing to the 285’s when the time came, if LR are fitting them there obviously isn’t an issue with a larger size. 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

Vogue wrote:

why don’t Formula one cars run on bike tyres if wider are no good ?

The same reason dragsters don’t - too much power. However, I’ve yet to spin the wheels on my FFRR, so there’s that requirement out of the window.

Big exhausts are also offered on the sportier models - but offers absolutely zero benefit in terms of performance, just like stripes or badges

For me, the wider tyres look nicer, but I acknowledge that they create (slightly) more drag, noise etc and are more prone to aqua planing.

I know I should run 255’s in the winter, but I like my 22’s so have 295 winter tyres - my choice, my compromise

I’d agree though - 295’s are a change rather than an upgrade IMHO

BTW - are the SVR wheels the same width ?

The SVR wheels are wider and have a different offset at 10” wide and 42.5mm.
OEM std 22” are 9.5” wide with a 49mm offset and
Std 20” are 8.5” with a 47mm offset

The offset has to change quite a bit as the wheels are 1.5” wider than the std 20” otherwise they are likely to catch the arches or the inner suspension 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

Thanks - that answers my question as to the wisdom of 295’s on the standard 22’s

Well, today I’ve ordered a set so I will report back my findings

one slight mystery though - What are they going on ?????? 2021 L405 Vogue SE 4.4 V8 DIESEL ~ #17

I collect my new to me 405 tomorrow 4.4 AB