Just a quick comment.

Changing from 245/70/R16 to 265/70/R16 will sure make your FC go high. The tire is now wider and heavier. IT will also increase your braking distance. If use mostly on tarmac, rugged thread will increase noise to your ears 

Anyway stay withing manufacturer recommended spec or the insurance will not pay any compensation if anything happened due to modification.

The manual will tell you what size range for your car. If you go beyond the permissible limit, then if any accident happened the investigation will say that you cannot brake in time because you change the tire size beyond the vehicle brake capability, for example.

If you want more pick-up, then change to bigger wheel and lower profile tire. Less rubber, the lighter to rotate. Wheel has less inertia moment. Again, has to be within spec. Otherwise your speedometer is not correlate to your actual speed.

Changing to larger wheel just add weight.

TS should just find a set of lightweight rims of the same OEM size and keep the current tyre. That will give you noticeable benefits, but don't expect a lot of it.

Bring along a luggage weigh or weighing machine when shopping around, don't feel paiseh or awkward as you are looking for lighten benefits. If end up heavier (unless you really love the design), just keep your current OEM rims. And please select genuine brands instead of replica or copy design. Although many people say they run fine, but when stresses occur, no one knows what will happen as these weren't tested for strength and rigidity....

(A ball park understanding is a reduction of 1kg of rotating mass is equivalent to 3kg (some say up to 7 kg) of curb weigh savings). That is why can get better acceleration, improved braking distance and improved fuel economy, provided you don't widen your tyres)

1. any changes on fuel consumption after changing the rims & tyres? my current driving pattern with stock wheels earn me an average fuel consumption of around 8.5L per 100km, mostly city drives without much jam..
fuel consumption will be higher.bigger tyre more heavy.but better dry traction and handling.
2. budget matter.. if i put a budget around RM6000, basically what type of rims and tyres can i get?
u can get a lot..265 tyre cost around rm 450-500 for branded tyres like bridgestone/maxxis a/t type.rim usually cost below rm 2000 for lenso.average imported rim are somewhere rm 1300 plus minus
3. usually i see most ppl who changes the wheels will lift up their ride by few inches, isit really necessary?
if u dont change oversize don't have to lift up.because oversize tyre caused rubbing when u turn your steering.unless for aesthetic purpose.some thinks lifting make car nicer.
4. can i just change the wheels and needless to lift up?
usually change 8-8.5j.but it also depend on yr car model and also rim and tyre spec

do u like black rims?haha..feel black rims looks very sporty on 4x4 and especially the new ford ranger.so garang 

From your tyre size, i presume maybe you're driving a triton. If you go 265/70/R16, your speedo will be out by more than 3%. Here's a comparison website you can play with :

https://www.wheel-size.com/calc/?wheel1=245...scl=50mm&sr=0mm

6k plus tyres relegate you to 2nd hand rims category....i'm more familiar with normal car rims but i'm not in the know regarding 4x4 type of rims....you'll need to look around and go through some dedicated 4x4 forums to ask for opinions.

Unless there's a specific need for such wider tyres, there is really no need for you to go for wider tyres as most aftermarket rims will have a little more "poke outwards" compared to OEM rims. Meaning, it will be closer to the side fender, or some call it more "flushed" look.

But again, in short, unless you really damn like the design of a particular rim, if it is heavier than OEM (don't care whatever seller claim, just go weigh yourself), really no point changing.

Seems like not much discussion on 4x4, was about to start a new topic but found this. Since it's 2018, I believe TS should have upgraded accordingly right?

Anyway, just to share and ask here.. my car is Isuzu DMax 2014, original tire is 245/70R16, I've used original Bridgestone HT & Yokohama AT, overall both are good tires, the Bridgestone HT is quite, comfort, grippy on wet & dry, where Yokohama AT is slightly poorer than the Bridgestone HT on road, but a lot better at offroad.

Early this year while replacing tires, I just couldn't resist to make my car looks more "bold", so I've changed to 265/75R16, which is about 55mm bigger in diameter & 20mm wider than original, and to make it looks more "bold", I choose a more aggressive pattern AT tire, which is Maxxis 980, looks somehow similar with BF Goodrich KO2 but a lot cheaper.

To add a cherry on top, I've change a set of rims with smaller ET number, from original +33 now +10, tires slightly protrude outward now.

Car looks great now, taller, wider and looks meaner with the bigger tires, but the consequences due to the bigger tire size are super down on power and high fuel consumption, previously 8.5l/100km now 10l/100km, also due to the aggressive AT tire, it's less grippy on road, noisier and even more bumpy. I used to drive fast but now.. it's scary to drive fast.

Above are my sharing.

Now, funny thing is, the desire never stop, I'm now checking on 285/75R16.. probably will do it if they fit.

Anyone having experience with fitting 285/75R16 or 33 in tires on their DMax?