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Discussion Starter #1
Hi
Has anyone fitted 195-50-15 tyres to a Mk 2 1.6 Dynamique Clio using the standard wheels?
Any problems? What tyres and what did you think of them?
cheers
Mick
 

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Hi there Mick, what you are referring to is a system (or principle) initially developed by Pirelli called the 'Plus One' system. Whereby you increase the size (usually width) of the tyres already fitted to the next size up.

I haven't done this on a Clio, but have done this on a few cars I've owned in the past.

The things to look out for are;
  1. Are you increasing the sidewall height of the tyre? If so, by how much?). This is calculated (in mm) by dividing the width of the tyre (e.g. 195mm) by the percentage aspect ratio (in your case, 50%) which gives a sidewall height of 97.5mm. Compare this with what you already have in place.
  2. If the difference isn't too great (+/- 4mm) then the effect on the speedo/gearing is minimal, anything outside that range will have the effect of (if greater)increasing the gearing & making the speedo under-read or the opposite (if less).
  3. The next consideration is clearance within the arches & splashguards. Before considering any changes, you should have a good feel around the tyres (front & rear, remember - and put some people in the rear seat as well) and with the tyres on full lock in both directions. This is to ensure that any increase in sidewall height will not cause fouling of the tyres under any normal driving circumstance. Plus, of course, you will be increasing the width of the tyre, so any increased width (i.e. 10mm) will be split evenly by (+ 5mm) on the inside of the wheel and the outside.
  4. You must also ensure that the tyres will not protrude from the wheelarch - this is illegal.
Hopefully, I haven't put you off, and if it all works out, you will enjoy all the benefits from having a greater contact area with the road. Regarding tyre choice, I would definitely recommend a directional tread pattern (more consistent wet weather performance over its life), buy the 'best' brand you can afford, and shop around (online as well) beforehand.

This is definitely a case of measure twice and cut once.

All the best,

Paul
 

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Discussion Starter #4
Hi

Thanks for all the advice.

I'll get measuring this weekend. I'm thinking about going to the new size not just for the extra contact area but also for the greater choice of tyres in this size.

The standard are 185/55/15. Not exactly a common size.

My Fiat Barchetta has 195/55/15 and I'm changing that one to 205/50/15 when they're worn out. I've got P6000s on the b, they're quite good.

cheers

Mick
 

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I did this back when I owned a Clio... father still runs that size now.

No problems at all - no rubbing, and the wheels are wide enough to take the extra width without distorting the tyre.

Word of note however - change all 4 at once when you do this - the 195/50 has a slightly smaller rolling diameter than the 185/55.
 

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Ideally the 185/55R15s should be replaced with 205/50R15 to retain almost the same rolling radius and therefore not affect the speedo and fuel computer, etc.

You can check this on sites such as Car Bibles where you can type in various tyre sizes and compare with alternatives. Some tyres manufacturers sites also have conversion systems.

Having seen the comment about the larger thread being "draggy", I'm probably going to stick with the 185/55s but get some with rim protection to save my alloys further damage (chewed up when I bought the car in July honest!).
 

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Broader tyres don't always mean better grip. Tyre traction can be a very fine balance between the area of surface contact and ground pressure - this can be especially noticable in the wet as the risk of aquaplaning can increase. Also in my experience broader tyres can upset the steering and suspension geometry and as a general rule road noise increases.:)
 
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