A dummy trying to understand off set .

Muddybugga

Muddybugga

Member
looking for NICE rims for a 2018 Triton (I'm a sucker for polished rims ) .I'm going for 8x 16 's because i want more tyre ..I was told I need +20- +30 offset .most rims that size ,have limited selection in style ,well i should say none I LIKE .all the ones I like are 0 offset ...so what does off set mean ..do they stick out past the guards of are they more in the guard .if i had a cruiser or hilux they seem to fit everything .anyway what problem would i have putting 0 offset on .not brought anything yet ,
thanks in advance
 
itlldoo

itlldoo

Well-Known Member
not hard dude, offset refers to the rim center, 0 offset means there is equal distance from inside and outside the rim to center, + offset moves the center to the outside of the rim in-turn the tire will be in the guard more but can cause tire rubbing on the inner guard when under flex, - offset moves the center of the rim closer to the inside and in-turn moves the tire out more which can make the tire contact the outer guards and the police don't like tires that stick out.
 
Muddybugga

Muddybugga

Member
cheers man ..so they will stick out 15 -20 ml I guess ...,shirking my tyres from 275 to 265 ,also going to 8 's rather than the 9's ..so might be 15 ml ..will the police notice ??.lol .

pimp my guards maybe .
 
Hoyks

Hoyks

Well-Known Member
-ive offset has the mounting face closer to inside face of the rim. +ive closer to the outside face.

If your standard is +20-+30 and you are looking at 0's, then they will stick out 20-30mm. Depending on how enthusiastic your transport inspectors are, they might not like it as there is a maximium you can increase the wheel track, but it won't be hideously noticeable. You might need some extended flares too.

wheel-offset-backspace.png
 
Chatty

Chatty

Well-Known Member
Muddybugga said:
l ..will the police notice ??.lol .
Click to expand...
Depends on where you are and what your ute looks like.
In some areas there are cops who will hound you if they think there's a good chance of infringement.
And the more modified the vehicle looks - the more chance the cops will go over it with a fine tooth comb. Unfortunately, flash wheels are like having a big neon sign that flashes "LOOK AT ME".

Plus, if you're in a state where you need rego inspections, there's a good chance of being picked up then.
 
Muddybugga

Muddybugga

Member
rules are pretty relaxed here ..but i don't really like constantly washing the side of my ute .wider guards are fairly cheap ...so i my be going for the full pimp ..one of my friends has his tyres sticking right out .and huge lift hilux.but he says when hitting cow shit ,don't leave your arm hanging out the window ,
 
Muddybugga

Muddybugga

Member
thanks for the diagram hoyks ...i understand now...does this mean i get a deeper looking dish rim ? which i love ,
 
2

2luxes

Well-Known Member
Muddybugga said:
.does this mean i get a deeper looking dish rim ? which i love ,
Click to expand...
Don't go too far. The distance between the centre of the wheel and the wheel bearings is a lever. Increasing or reducing it will alter the weight distribution on the bearings and can result in premature failure.

The same applies to larger diameter wheels. The distance between the road and the centre of the wheel is also a lever. Increasing it has been known to break not only wheel studs but the axle flanges.
 
discomatt

discomatt

Well-Known Member
Exactly what 2luxes said, wheel bearings is the biggest issue, you can go from them lasting 200,000km to 50,000 which would be a pain in the ass and why I have stuck with standard rims on my old bus even though it limits me to 32's
 
devjam

devjam

New Member
Re: legalities, in most states you can only legally increase the wheel track by a maximum of 50mm*.

Eg. going from a stock +55 offset wheel, the most you can decrease offset (and thereby increase track) by on each wheel is 25mm so that means +30 offset wheel.

Depends on how important having a road legal vehicle is to you in the event of a crash/insurance claim.

* EDIT: without engineering sign off.
 
Last edited:
2

2luxes

Well-Known Member
Muddybugga said:
cheers guys ...certainly looking for the right size now ..after hearing that ..
Click to expand...
What I said is just one of many features of suspension design that the vast majority of car owners are not aware of. There are countless more features that play their part in car stability and reliability.

One of them is "wheel rate". We hear a little about spring rate but not that one on forums like this.

Put the words "wheel rate" into google then have a look at the sites that come up and the section headed "People also ask".
 
2

2luxes

Well-Known Member
Chatty said:
And let's not forget unsprung mass.
Click to expand...
That is another important feature of suspension design. There is another dozen or two we could talk about.

One of them is " compliance steer ". That is another important safety feature when out on the highways at high speeds. Who knows what off road modifications have done to that.
 
discomatt

discomatt

Well-Known Member
2luxes said:
That is another important feature of suspension design. There is another dozen or two we could talk about.

One of them is " compliance steer ". That is another important safety feature when out on the highways at high speeds. Who knows what off road modifications have done to that.
Click to expand...
Some manufacturers make a meal of handling from factory so couldn't get much worse could it?
 
L

Lost1?

Well-Known Member
Running 16 x 8 +20 offset rims on my Triton with 285/75r16 tyres. They rub on the front mud flaps when getting close to full lock. Nothing a quick trim of the polished areas won't fix. The side wall protrudes just past the flares, but the tread looks to be inside the flares. So borderline.

But no issues to date with the coppers on either running oversize tyres or what is outside the flares. But I don't drive like I stole it. Hence don't attract any attention.
 
Muddybugga

Muddybugga

Member
Still confused on my rim choice ,,as I had 2 different lots of info ...I want as bigger dish as i can on my ute .like sunk it look .
looking at the diagram ...the more negative or 0 , i go the deeper the dish ..eg ..like some of the cruisers with -44
but my tyre supplier tells me if i want this look ..i need to go + 20 ...not 0
i punch in a search for the triton and a +5 will fit ...so I'm confused on their suggestion ,but by the diagram i know its incorrect .
so if i want a deeper looking dish i should go +5 not +20 ??
 
Chatty

Chatty

Well-Known Member
Muddybugga said:
Still confused on my rim choice ,,as I had 2 different lots of info ...I want as bigger dish as i can on my ute .like sunk it look .
looking at the diagram ...the more negative or 0 , i go the deeper the dish ..eg ..like some of the cruisers with -44
but my tyre supplier tells me if i want this look ..i need to go + 20 ...not 0
i punch in a search for the triton and a +5 will fit ...so I'm confused on their suggestion ,but by the diagram i know its incorrect .
so if i want a deeper looking dish i should go +5 not +20 ??
Click to expand...
From my recollection, if you want that deep dished look, then you need a more negative offset. So, yes, +5 will give you a (15mm) deeper dish than +20. But as you go more negative with offset, the wheels protrude further from the vehicle - given that you are limited (by regulation) to not increasing your track by more than 50mm, you can't decrease your offset by more than 25mm from standard.
For example, if+5 is standard for a Triton (I'm not saying it is) then you couldn't go less than -20 on offset.
 
You must log in or register to reply here.
Top