VXOC Astra-J/GTC

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Hi all, 

Sorry for the really stupid email but thought I'd ask a group of people who'll know more than me.

I purchased an Astra GTC Limited Edition for my wife which came as standard with the 20" wheels.

Unfortunately the road she takes to work is damaged with nasty pot holes and shes damaged her alloys.

I'm looking to get these sent in for repair but we going to put on a set of 18" alloys (can't go lower due to size of the brake kit fitted) but I'm unsure of the wheel setup.

The ones on the car are as follows from what I've found through Vauxhall:

[*]Alloy Wheel 20 inch - 5-Y-spoke
[*]Smart high-quality alloy wheel with 5-Y-spoke design and bi-colour finish.
[*]Fits tyre size 245/40 R 20 95W
[*]Dimensions: 8.5J x 20 ET 41
[*]Bolt pattern: 5 x 115

Anyone have an idea for an 18" wheel with regards to the setup as above.

Thanks to everyone who reads this message and / or replies

Greatly appreciated
the info you need is all in this thread
https://www.vxoc.org.uk/forum/Thread-Wheels-and-tyres