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known issues with changing rim/tyre combination


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Hey guys,

I'm currently running 17x7.5 rims with 225 45 R17 tyres on my 98 GC8 V4 Coupe.

Is anyone aware of, or have run into any issues going to a 18x8.5 with a 245 40 R18 tyre?

The rolling circumference is 57mm different between the 2 tyres, 10mm different in static rolling radius.

I'm looking to fit 25mm wheel spacers that convert the 5x100 stud pattern to 5x114.3 and install flares.

Has many done this, if so any dramas, i.e. scrubbing, limited turning radius, etc.

Any feed back greatly appreciated.

Cheers

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You need to state the offset of the wheels, as it makes a big difference.

I.e.

17 x 8 inch rim with 0 offset sits out further from the bodywork than 17 x 9 + 40 offset.

If you use flares then you can go pretty wide depending on size of flares. In saying this my 17 x 7 inch rims + 38, 215,45,17 rubbed on bodywork.

Edited by ballsrburning
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According to one of the online wheel calcs, running a 245 40 R18 on a 18x8.5 the wheel will sit 14.7mm closer to the strut in comparison to a 225 45 R17 on a 17x7.5 rim, however using a 25mm spacer will solve that problem. I roughly worked out the wheel should sit 48-49mm further out than the factory wheel arch, does this sound right?

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Inner well clearance shouldn't be an issue if you use conversion spacers as your an inch further away from the factory inner guards, suspension etc. I wouldn't track it that way but street should be fine. You will definitely need flares with the 18 x 8.5 rims basically same offset as old rims but effectively running 18x 9.5 if you take spacer into account.

I would say you would be fine with flares but personally haven't done iT.

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 ballsrburning said:
Inner well clearance shouldn't be an issue if you use conversion spacers as your an inch further away from the factory inner guards, suspension etc. I wouldn't track it that way but street should be fine. You will definitely need flares with the 18 x 8.5 rims basically same offset as old rims but effectively running 18x 9.5 if you take spacer into account.

I would say you would be fine with flares but personally haven't done iT.

whats the issue with running it like that on the track?

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The tyre calculators are pretty good, I've gone 18 x 10 with negative 20 offset and it basically matched the predicted results. Im only working on the rim difference not including the tyres fitted.

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Doing something similar on my coupe haha. Flares+ 245 should fit with ease, you'll have to cut into the fender a little depending on how you want it to fit

Heaps of info over at Nasioc, The sites down so I can't link right now but there's a big topic in there somewhere with diy fender install write up and discussion

http://forums.nasioc.com/forums/showthread.php?t=1427863&page=9

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 slystiguy said:
Doing something similar on my coupe haha. Flares+ 245 should fit with ease, you'll have to cut into the fender a little depending on how you want it to fit

Heaps of info over at Nasioc, The sites down so I can't link right now but there's a big topic in there somewhere with diy fender install write up and discussion

http://forums.nasioc.com/forums/showthread.php?t=1427863&page=9

awesome cheers buddy, much appreciated!

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I don't like using spacers due to forces seen especially when they change the pcd on the wheel from 5x 100 to 5 x 114.3. It has to add a lot more force on the wheel bearing etc which are not exactly strong on the 5x100 model.

If you are running them they may need certing I would look into this if I were you as I'm not sure.

My wheels on gc8 too. But highly modified now lots cut away.

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 ballsrburning said:
I don't like using spacers due to forces seen especially when they change the pcd on the wheel from 5x 100 to 5 x 114.3. It has to add a lot more force on the wheel bearing etc which are not exactly strong on the 5x100 model.

If you are running them they may need certing I would look into this if I were you as I'm not sure.

My wheels on gc8 too. But highly modified now lots cut away.

yep would need certing, any thing over a 10mm slip on spacer requires certification and going larger rims also i believe. I'm only assuming rims as they are different to the specified size for that make/model and mine are listed on the cert plate

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out of curiosity does anyone know what the difference between these 2 wheel spacer adapters are apart from the price....

http://www.scarles.co.nz/shop-online/wheel-products/wheel-spacers-5x100-to-5x114-3-12x1-25-25mm-pair

http://www.scarles.co.nz/shop-online/wheel-products/wheel-spacers-5x100-to-5x114-3-12x1-25-25mm-pair-24996

for the life of me I cannot see any difference except price, and if so why the price difference?

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I can't see any difference either, but it's scarles so they have probably messed up the listing some how.

It's not either a price for a single one.

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ANY wheel spacer or adapter will need to be certed AFAIK.

http://lowvolumevehicle.co.nz/2012/02/wheel-spacers-faqs/

And from the lvvta site http://www.lvvta.org.nz/knowledge_base.html

Do wheel spacers and adaptors require LVV certification, and if so what are the requirements?

Yes - a vehicle fitted with any wheel spacers or adaptors needs LVV certification. The maximum thickness allowed is 20mm for spacers and 30mm for adaptors. Refer to LVV Standard – Learn More

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If you want to add an adaptor to change your PCD I would go and talk to a certifier before you buy anything. They are quite knowledgeable on the subject and can advise you on the right rim offset vs adaptor offset combination.

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