GTC Wheels GT-CX model (exact same look as VMR)

[MGV]

10 wider each side doesn't equate to 20 wider overall ?? My math is bad ! !

[Pullstarter]

Offset only applies in one direction, its how far off centre the mounting surface of the wheel is so it's only measured once. Have a look here it explains all:

PCD and Offset explained

Your maths isn't wrong your assumptions are lol

[MGV]

Cheers for the link, mate, had a good read through & my brain won't let me go to sleep tonight until i fathom this...

"The ‘Offset’ of a wheel measures the distance between the wheel centreline and the wheel mounting face and is measured in millimetres. "

So the diff between an ET35 & an ET45 from the centreline of the wheel to the mounting face is not 10, but 5mm? I was thinkin' 10 on the left side of the car & 10 on the right... Somethings just not adding up . . . . . Arggghhhhhhh..... !

[HaywireTig]

Yes I too had the impression that it's 10mm difference between ET35 and ET45! Isnt that right?? Lol

By that definition in the link:
Offset (ET) = Wheel Centreline (WC) - Wheel Mounting Face (WMF)

Hence, if:
WC > WMF, then offset is +ve, ie WMF is inside of WC.
WMF > WC, then offset is -ve, ie WMF is outside of WC.

Meaning:
ET35 sits 35mm inside of WC.
ET45 sits 45mm inside of WC.

So since ET35 and ET45 are +ve, then ET +35mm - ET +45mm = 10mm difference. ie ET35 is 10mm closer to WC than the ET45, which in lament terms, means it sits 10mm further OUT on each side.

No??
Lol.....

Did I get it right?? Can someone confirm if my thoughts/math is correct?? *faint*

[Pullstarter]

Kind of lol. It can be confusing don't worry. You're right MGV, each wheel is 10mm further out with an ET35 vs ET45 but you wouldn't say that gives you 20mm more offset, talk in terms of each wheel rather than pairs or you could just as well say ET35 gives you 40mm more poke if you added all 4 together.

An easy rule of thumb in working out how much more poke you're going to get is add the ET difference (in this case 10mm) to half of the extra wheel width, e.g. let's say you went from a 20x8 ET45 to a 20x9 ET35, the ET gives you 10mm extra poke, the extra width you would halve because it goes both inside and outside so 9"-8" = 25mm (close enough) so that gives you 12.5mm extra width plus 10mm extra offset which results in an OUTWARD increase of 22.5mm overall over your old wheel. The inside of the rim would be half of the extra width, in this case 12.5mm MINUS the offset increase of 10mm, so the inside of the rim will sit 2.5mm further in that your old wheel. ERGO, stay with me where hehe, you will be 22.5mm further out and 2.5mm further in which is an overall width increase of 25mm YAY!!. PHEW lol.

[MGV]

Awww, yeeaaahhhh... NOT! But as soon as i read the scientific term, 'poke' i knew everything would be ok... Kind of lol, hehehe!
Hang on, what 4 things are we adding together to get 40mm worth of more poke? I had no concern with the 'offset' at the inside of the wheel, just the distance from the outside of the left wheel to the outside of the right wheel... So my wheels, 19x8.5 ET35 give me an outside of wheel to outside of wheel measurement of about 1780mm. I am just hoping that an outside of wheel to outside of wheel on a 19x8.5 ET45 equals about 1760mm, or 20mm less... (keeping the width the same, just altering the offset, to keep it simple...)

Please write back, Simon! My brain's blowing bubbles... !

[Pullstarter]

Yep that will be 20mm less wheel to wheel.

[MGV]

It won't be bad, its just that most people want the look to be as wide as legally acceptable... ie flush with the guards. ET35 will give you a 20mm wider 'stance' compared to ET45.

sigh...

Thanks for your patience, Simon... When i mentioned 'stance', i meant wheel to wheel, sorry if not clear ! Got more than i bargained for with additional pokage information! Hehe...

[hippyhippy]

Kind of lol. It can be confusing don't worry. You're right MGV, each wheel is 10mm further out with an ET35 vs ET45 but you wouldn't say that gives you 20mm more offset, talk in terms of each wheel rather than pairs or you could just as well say ET35 gives you 40mm more poke if you added all 4 together.

An easy rule of thumb in working out how much more poke you're going to get is add the ET difference (in this case 10mm) to half of the extra wheel width, e.g. let's say you went from a 20x8 ET45 to a 20x9 ET35, the ET gives you 10mm extra poke, the extra width you would halve because it goes both inside and outside so 9"-8" = 25mm (close enough) so that gives you 12.5mm extra width plus 10mm extra offset which results in an OUTWARD increase of 22.5mm overall over your old wheel. The inside of the rim would be half of the extra width, in this case 12.5mm MINUS the offset increase of 10mm, so the inside of the rim will sit 2.5mm further in that your old wheel. ERGO, stay with me where hehe, you will be 22.5mm further out and 2.5mm further in which is an overall width increase of 25mm YAY!!. PHEW lol.

ok so in conclusion.. are these ctx wheels with ET45 ok for our tiguan? LOL .. serious question

[Pullstarter]

Are they 8" or 8.5"? ET45 will work in either I reckon, definitely in 8"s. I had 18x8 ET45s on at one stage and they were fine. Not very aggressive looking but depends what you're after.