ZX Wheel Size

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greatoaks
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ZX Wheel Size

Post by greatoaks »

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
Chrisk
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Post by Chrisk »

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
Dave Burns
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Post by Dave Burns »

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
greatoaks
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Post by greatoaks »

thanks for the advice chaps...all noted
Jon

Post by Jon »

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
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greatoaks
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Post by greatoaks »

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.
Dave Burns
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Post by Dave Burns »

The rolling radius of you chosen set up is 288mm, what is the original.
Dave
greatoaks
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Post by greatoaks »

original set up with 165/70x13 was 172mm.
new set up 195/50x15 is 180mm
Dave Burns
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Post by Dave Burns »

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
greatoaks
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Post by greatoaks »

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