ZX Wheel Size

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greatoaks
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ZX Wheel Size

Postby greatoaks » Fri Sep 13, 2002 2:28 am

Can anyone tell me if my '94 1.9D Avantage will take 15" wheels from a xantia or a 205/405 without fouling suspension or steering. Also what would be the widest tyre fitment...cheers
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Chrisk
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Postby Chrisk » Fri Sep 13, 2002 11:20 pm

My ZX has been lowered 50mm on 16" alloys with 195-50-16 tyres and doesnt rub at all. I think some models were fitted with 15" alloys as standard so I can't see it being a problem
Hope this helps
Chris
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Dave Burns
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Postby Dave Burns » Sat Sep 14, 2002 12:27 am

ZX wheels as far as I am aware are 13" or 14" depending on the model, including the Aura and the Volcane which were the only ones to get alloys.
You will need to match the rolling circumference of any other wheel/tyre combination with that of the originals, the speedo will be less accurate if you don't.
Also make sure your Insurance company approves of the change, if you have a prang the rubber is the first thing that gets looked at.
Dave
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greatoaks
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Postby greatoaks » Sat Sep 14, 2002 1:35 am

thanks for the advice chaps...all noted
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Jon
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Postby Jon » Sat Sep 14, 2002 2:50 am

The ZX 16 valve came with 15" alloys as standard anyway.
I ran 15" wheels froma Peugeot 205 1.9 GTi on 195/50/15's with absolutely no problems at all, on a ZX Volcane.
Anything from 205,306,309,405 etc has the same offset/ PCD and go straight on with no problems.
Jon Wood
IT Supervisor
GSF t/as Andyspares
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greatoaks
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Postby greatoaks » Sun Sep 15, 2002 12:42 am

I am about to fit 205 gti 1.9 alloys fitted with Toyo Proxes 195/50x15 tyres.. can anyone tell me if this will cause any inaccuracy in the speedo calibration.. The rolling radius appears to be similar to the standard 13" set up.
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Dave Burns
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Postby Dave Burns » Sun Sep 15, 2002 4:37 am

The rolling radius of you chosen set up is 288mm, what is the original.
Dave
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greatoaks
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Postby greatoaks » Sun Sep 15, 2002 3:59 pm

original set up with 165/70x13 was 172mm.
new set up 195/50x15 is 180mm
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Dave Burns
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Postby Dave Burns » Sun Sep 15, 2002 8:13 pm

I don't know how you have arrived at those figures but here's how to calculate the diameter from any given tyre size.
Example: 195/50x15
195=width, 50=aspect ratio(percentage of tread width), 15= rim diameter in inches, 15 x 25.4 = 381mm

195 x.5 x 2 + 381 = 576 diameter or 288 radius
165 x.7 x 2 + 330 = 561 diameter or 280 radius
The original tyre will be doing approx. 1065 rmp @ 70 mph
The 195/50x15 will be doing approx. 1037 rpm @ 70 mph
The car will travel less than 2" further per wheel revolution on the 15's, an error of about 2.5% so hardly worth bothering about since speedo's aren't that accurate anyway.
Dave
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greatoaks
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Postby greatoaks » Mon Sep 16, 2002 5:54 pm

I got confused over working these out.
thanks for showing me the correct way, Dave
excellent info.
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