Cup 1 Wheel Help Please.

Wikkid911 · 02-09-2010, 07:45 AM

I've looked through all the posts I can regarding wheel sizes and offsets and i'm in danger of becoming confused. Can anyone shed any light on this please.

I'm looking at Cup 1s.
Spec for the wheels are....

Front tyres 215/45ZR17

Rear Tyres 235/40ZR17 90W

Front alloys Borbet 71/2J x 17H2

Rear alloys Borbet 9J x 17H2

They have no ET numbers stamped near the valves. I also read somewhere that Borbet made these wheels under licence from Porsche.
I'm looking to bolt these straight on to my '90 C2 without any messing about.
Are these the right ones for my car.

Any help is much appreciated.

Cheers

Rocket Rob · 02-09-2010, 08:15 AM

There is another thread (below) about Cup1 wheels that includes a breakdown of all of the various sizes and what the ET numbers are for each.

http://forums.rennlist.com/rennforum...-i-wheels.html

boxsey911 · 02-09-2010, 09:02 AM

I'm not familiar with wheels made by Borbet but if they're like the mille miglia reps then you might find the offsets embossed on the rear of the spokes.

The width of the rear tyre sounds too narrow for a 9J rim. 255/40 17 would be the norm.

02-09-2010, 07:45 AM	#1
Wikkid911 Remarkable Rennlist Member Join Date: Jul 2003 Location: Currently living the dream Posts: 1,302	Cup 1 Wheel Help Please. I've looked through all the posts I can regarding wheel sizes and offsets and i'm in danger of becoming confused. Can anyone shed any light on this please. I'm looking at Cup 1s. Spec for the wheels are.... Front tyres 215/45ZR17 Rear Tyres 235/40ZR17 90W Front alloys Borbet 71/2J x 17H2 Rear alloys Borbet 9J x 17H2 They have no ET numbers stamped near the valves. I also read somewhere that Borbet made these wheels under licence from Porsche. I'm looking to bolt these straight on to my '90 C2 without any messing about. Are these the right ones for my car. Any help is much appreciated. Cheers __________________ Dave '90 C2 My Beast

02-09-2010, 08:15 AM	#2
Rocket Rob Addict Rennlist Member Join Date: Aug 2001 Location: Nashua, New Hampshire, USA Posts: 2,405	There is another thread (below) about Cup1 wheels that includes a breakdown of all of the various sizes and what the ET numbers are for each. http://forums.rennlist.com/rennforum...-i-wheels.html __________________ Rob '90 C-4 Cab (daily driver-230K miles on original engine) '91 C-2 Coupe (weekend toy/DE car) '91 Honda Civic Si (winter-mobile)

02-09-2010, 09:02 AM	#3
boxsey911 Addict Rennlist Member Join Date: Feb 2007 Location: Cheshire, UK Posts: 1,661	I'm not familiar with wheels made by Borbet but if they're like the mille miglia reps then you might find the offsets embossed on the rear of the spokes. The width of the rear tyre sounds too narrow for a 9J rim. 255/40 17 would be the norm. __________________ ___________________________________ Steve - Assistant Secretary for Porsche Club GB 964 Register 964 C2 coupe GP White Running report about my 964