Hey again - as a bit of a follow-up to my last post. im stuck on the other side of the world, with a mk2 garaged in Perth awaiting the holy rebuild upon my return..

I've seen Steve's forest arch rebuild in the 'steve's mk2' thread and I'm pretty keen on doing the same.

of course, a 6-inch rim would prolly look wrong under those arches... so I'm thinking a rebel wheel in 14-15inch x 7-inch format would be the goer.

which is all well and good on the track - but what about road legality? in WA to be precise? Is this permitted at all?? or do you need an engineer's cert or something?

cheers!

Vic laws are something like 50mm extra on track width. Can only have 2" bigger rims. so 15s on an esky and like 20mm extra width. so 175 standard you can have 195 X0 15s. And i believe we have a rolling diameter increase restriction. WA would have its own laws tho. Which should be easy to find. If not talk to the people whos job it is too know. (eg I would talk to Vicroads)

p.s 265s look nice under forest arches hehe. I was in the newsagents and looking at so mag and a red arched Mk2 had 13inch wide tyres on the ass end... Geezz that thing looked tough.

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Originally posted by JordyCharlieBoz

Vic laws are something like 50mm extra on track width. Can only have 2" bigger rims. so 15s on an esky and like 20mm extra width. so 175 standard you can have 195 X0 15s. And i believe we have a rolling diameter increase restriction. WA would have its own laws tho. Which should be easy to find. If not talk to the people whos job it is too know. (eg I would talk to Vicroads)

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I was always under the impression that the 50mm (2") on the width is actually the rim...nothing to do with the tyre itself...could be wrong tho.

Cheers
Bryan

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Originally posted by BryanS81

quote:

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Originally posted by JordyCharlieBoz

Vic laws are something like 50mm extra on track width. Can only have 2" bigger rims. so 15s on an esky and like 20mm extra width. so 175 standard you can have 195 X0 15s. And i believe we have a rolling diameter increase restriction. WA would have its own laws tho. Which should be easy to find. If not talk to the people whos job it is too know. (eg I would talk to Vicroads)

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I was always under the impression that the 50mm (2") on the width is actually the rim...nothing to do with the tyre itself...could be wrong tho.

Cheers
Bryan

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^^^^^^^^^^ correct

http://www.vicroads.vic.gov.au/NR/rdonlyres/CC48FC10-4D57-4F04-82E1-3BD72EF88340/0/VSI8.pdf

For Vic you can only have 1" wider rims than factory and the largest allowable increase to track width is for the front 25mm and the back as the escort doesnt have IRS is 50mm.

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Originally posted by fordsy


WA makes a lot of reference to National Standards of Practice for Light Vehicles. Here are some more links.


http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/pdf/NCOP11_Section_LS_Suspension_and_steering_3Feb2006.pdf

Good luck. Post some pics when you get around to doing the car up.

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Been on holiday, nice surpise to see a healthy response to this thread. thanks for all the info guys. Following the info contained in the file supplied by fordsy above, the max tyre and wheel widths depend on what the widest OPTIONAL tyre provided by the manufacturer was...

Now, if were talking mk2's, I would guess 185s would have been the widest offered by ford. But I stand to be corrected here...

If you skip to the 17th page of the docco, a table shows the max allowable tyre/wheel width. A 185 max factory option equates to a permitted 235 width tyre, which corresponds to a 8.5inch rim when using a tyre ratio of 65 to 85, OR a 9inch rim for tyre profiles 60 or below.

Following my naive logic, if you fitted 15 inch (diameter) wheels to accomodate some fat brakes, then you would be pretty much forced to use a 60 profile tyre, thus permitting a 9 inch rim (assuming 185 tyres were offered as an option by ford).

Fat rims under forrest arches here we come.

Does anyone have any experience in fitting larger wheels tyres under a mk2? With a 13"rim its pretty basic, but what about the bigger diameter stuff? Methinks tyre availablity/price would start to play a role here too!

And fordsy - I wont be back in AUS till bout march next year.. so the photos might take a while. Planning and dreaming is the best I can do now :)

thanks guys!

Im putting 15x7's on the front of my car with 205.60s and 15x8's on the back with 265.50's. They are huge tyres. But they will fill the forest arches and look mean, which is what I wanted.

I dont see any problems in you going bigger tyres with arches. The only thing that stops you going bigger is when you run into something that an angle grinder wont remove =P

Also think about your final drive ratio as rolling diameter will effect that.

Have fun with this dude =)

thanks for the tip Jordy. Sounds like a fat looking solution indeed. From what I've read, I question the legality of your proposal, in WA at least. I thought all wheels should have the same width...

Post a pic once youve put them on!!!

I'm a bit late chiming in here, and read the aforementioned part about rim and tyre widths.

The only stick in the mud is that you are only allowed to increase the rolling diameter by a maximum of 15mm.

What this means is that if you go from a factory 185/13" rim to a 15" rim, the tyre can only have a max sidewall of 121mm (185mm*75%-25.4mm + 7.5mm) - (the -25.4mm is to allow for the 2" increase in rim diamater)

This equates to the following options based on a factory max of 185/75/13:
265/50/15 = 132.5mm sidewall - too big
235/50/15 = 117.5mm sidewall - ok
225/50/15 = 112.5mm sidewall - ok
205/60/15 = 123.0mm sidewall - too big
205/55/15 = 112.7mm sidewall - ok
205/50/15 = 102.5mm sidewall - easy.

Hope this helps.

Ash

so if my car has 8 x 16 wheels with 225/50 x16 as standard, this is what it has now, can i go to 9 x 18 with 235/40 x 18? or do i need an engineers report?
TONY.