Wheel advice

[Mysticality]

18x8 ET45 235/40R18 will fit FINE if you get the inside of the rear guards cut out. (easy job, 5min with a dremel)

Zei20t's wheels, IMO, will NOT fit (19x8.5 235/35R19) once he's lowered. He's at stock height at the moment which is a massive difference as far as clearance is concerned.

18x8 ET45 245/40R18 *may* fit, I'm yet to test this though.

[Guest001]

Hey can I ask how accurate your speedo is? the tyre calculator shows your setup to be almost 5% larger than stock and would result in a roughly 5km/h difference from stock. At an indicated 100km/h on your speedo your actual speed would be roughly 95km/h, but how accurate are they at that speed to start with, most cars would read less than 100km/h at an indicated 100km/h to start with, is this increased with your size tyres?

I am trying to stay as close as possible to the stock rolling diameter to avoid and potential issues be it with the car or the law
I'm just cautious off speeding fines......haha, I'd be thinking I'm going at the speed indicated on the speedo, but actually doing another.

cheers

In fact ALL car speedos must read over the speed you are actually doing and legally cannot read less.
The ADR rule states that they may be up to 10k over at 100kph <> 4 so they could be up to 14k fast but are not allowed to read under.
Putting larger tyres on makes it read slower but in my case in the Polo it is 7k over and to get it right would take tyres 40mm larger which are illegal

See here for accurate alterations Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

[brad]

In fact ALL car speedos must read over the speed you are actually doing and legally cannot read less.
The ADR rule states that they may be up to 10k over at 100kph <> 4 so they could be up to 14k fast but are not allowed to read under.
Putting larger tyres on makes it read slower but in my case in the Polo it is 7k over and to get it right would take tyres 40mm larger which are illegal

See here for accurate alterations Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

Hillbilly, if I can move mine 8kph by going up 20mm in diameter (which is still illegal) then why do you need 40mm to move the same approximate error? What am I missing?

[Guest001]

Hillbilly, if I can move mine 8kph by going up 20mm in diameter (which is still illegal) then why do you need 40mm to move the same approximate error? What am I missing?

Well according to the comparator I posted a 195/55/15 has a diameter of 595mm on a 5.5in rim

To get a 6.7% difference I would have to go to a 195/65/15 which has a diameter of 635mm. Diff is 40mm

Remembering the diameter is right across widest point and not the radius which is from the centre to one edge. In QLD 26mm is largest legal diameter difference
Put the figures in the comparator with the larger size on the left and you will see.

[tigger73]

Hillbilly, if I can move mine 8kph by going up 20mm in diameter (which is still illegal) then why do you need 40mm to move the same approximate error? What am I missing?

It'll be down to % change in rolling diameter. If Hillbilly is looking at a Polo it likely runs a smaller size wheel so the same change in mm will be a bigger % change compared to a Golf/Octavia or something bigger like an Amarok/Touareg.

[brad]

Well according to the comparator I posted a 195/55/15 has a diameter of 595mm on a 5.5in rim

To get a 6.7% difference I would have to go to a 195/65/15 which has a diameter of 635mm. Diff is 40mm

Remembering the diameter is right across widest point and not the radius which is from the centre to one edge. In QLD 26mm is largest legal diameter difference
Put the figures in the comparator with the larger size on the left and you will see.

OK, now I see why - 15". I'd fit 195/60r15, it will get you halfway there & be legal & not have scraping issues. If you can get it <5k then it's not nearly as annoying.

Fully aware of what diameter is.

[Guest001]

It'll be down to % change in rolling diameter. If Hillbilly is looking at a Polo it likely runs a smaller size wheel so the same change in mm will be a bigger % change compared to a Golf/Octavia or something bigger like an Amarok/Touareg.

In 18's its actually worse To get 6.8% diff its 56 mm Put the sizes into the comparator and see

[tigger73]

In 18's its actually worse To get 6.8% diff its 56 mm Put the sizes into the comparator and see

Yes so moral of the story is check your state rules/regulations on legal tyre fitment if you're looking at rim/tyre combos and also what tyres are available in those sizes.

As has been previously stated if you can keep to more common tyre sizes you're more likely to find tyres at a decent price.


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[DUBGTI]

So I have purchased some new wheels, but have decided to fit them to my MKV for the time being and let the missus keep driving the Octy, they are 18x8.5 18s VMR v710s in Hyper Silver.

I still need to purchase tyres for them but am unsure on 225 or 235 as to what will fit, I am going to lower it on some H&Rs with a 30mm drop, gonna head over to the MKV forum and see what people suggest.

One day the rims might sit beneath the octy

Cheers for the input guys.

[donweather]

They are my fav rims for sure. Can't wait to see them on either car. Will 225s fit on 8.5 inch rims? Will be some stretch for sure.

A few guys on here didn't recommend 8.5 inch rims nor 235 tyres (on 8 inch rims) on the occy. What's the ET of the VMRs?

[Dutch77]

They are my fav rims for sure. Can't wait to see them on either car. Will 225s fit on 8.5 inch rims? Will be some stretch for sure.

A few guys on here didn't recommend 8.5 inch rims nor 235 tyres (on 8 inch rims) on the occy. What's the ET of the VMRs?

225s on x 8.5 is fine, albeit there will be some stretch (depending on your definition of course).

The VMRs will be ET45.

The 235s will often be cheaper as 235/40 is a Falcodore sizing, although the 225s can be bought fairly priced if you hunt around (eg the Goodyear info under the relevant section). On the Mk5 I think you'll want 225s to minimise any rub, the 235s will definitely cause more issues in that regard unless you start fiddling with camber or the guards.

[Martin]

It's more common for the VMR wheels to be ET35
They do make ET45 - but most people got for ET35

ET45/8.5"/235 is going to have very little clearance to the shock
ET35 will increase the outside poke

I would expect some rubbing with 235's