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 Post subject: Re: Non standard tyres
PostPosted: Sat May 20, 2017 5:43 am 
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Location: Hemel
Drives: 107Allure5D62plate
nlel wrote:
ade33 wrote:
I would suggest you advise your insurance company that you have non-standard tyres fitted, even if your wheels are stock. Technically you've modified the car from the Smart spec, unless that size tyre was available as a factory option.


I have just got round to sending an email to my insurers regarding the change in front tyre size from stock spec and won't drive the car again until I recieve confirmation that my policy has been updated.

Mine said if it is visibly different they wanted to record but they were not interested in a 19 inch rear wiper blade in place of 12".

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 Post subject: Re: Non standard tyres
PostPosted: Sat May 27, 2017 1:57 pm 
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Just to bring some closure to this thread my insurers said...

"We have noted your policy with the slight change in tyre size, however we would not note it as a modification and it will not affect the cover you have"

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 Post subject: Re: Non standard tyres
PostPosted: Mon May 21, 2018 3:22 pm 
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Was searching these forums and found this tyre calculator posted in one of the messages...

http://www.alloywheels.com/tyreCalculator

I used it to compare my original 155/60/15 front tyres with the 145/65/15 fitted without my prior knowledge by the tyre fitter and it says...

"FITMENT OK! The percentage change is 0.44% and the circumference change is 2.5mm"

I also compared the standard mk1 triplets 155/65/14 with 145/65/15 and it says...

"FITMENT OK! The percentage change is 2.18% and the circumference change is 12.4mm."

These aren't within the recommended 1% tolerance of the original size but are still ok to fit.

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2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84bhp
Electric Windows
Air Conditioning
Smart Radio 9
Panoramic Sunroof
Luggage Compartment Cover
Softouch Automatic Gear Programme
Bodypanels & Tridion Cell in Silver Metallic
15" Alloy Wheels


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 Post subject: Re: Non standard tyres
PostPosted: Mon May 21, 2018 5:28 pm 
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Joined: Fri May 21, 2010 7:29 pm
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Location: South Molton
Drives: 2008 Citroen C1 Code
In the summer on my 2008 C1 I fit 195/40x16 tyres to 16" wheels, which using the same calculator gives...

"FITMENT OK! The percentage change is 0.94% and the circumference change is 5.3mm."

In the winter I use standard 155/65x14 winter tyres on the OE wheels.

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 Post subject: Re: Non standard tyres
PostPosted: Tue May 22, 2018 9:30 am 
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Drives: Peugeot 107 Urban
Going back to the original post, my 107 runs on 195/45 R15s as noted.. My reason to change was to be able to use after-market alloys (in my case 15in Momo Raptors), most of which have wider rims than standard. I would think that be the case for a majority of 107/C1/Aygo bug owners? You can use any of the on-line calculators to prove the fitment is OK.

For anyone thinking of fitting this combo I'd say what you get (apart from good looks) is far better roadholding on the bends, the expected harder ride (in a good way IMO), a noticeable increase in road noise and very, very slightly increased fuel consumption. Now, some of the road noise issues I have might be down to the tyre I use (Falkens) but it certainly isn't so bad that it spoils the fun, just be aware, and the grip on the road is so much better it more than makes up for it! Keeping the original rim as a spare means I also have to carry a spare set of OE wheel bolts.

I hope this is helpful to others considering 15in alloys..


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 Post subject: Re: Non standard tyres
PostPosted: Tue May 22, 2018 10:23 am 
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Location: South Molton
Drives: 2008 Citroen C1 Code
alans447 wrote:
For anyone thinking of fitting this combo I'd say what you get (apart from good looks) is far better roadholding on the bends, the expected harder ride (in a good way IMO), a noticeable increase in road noise and very, very slightly increased fuel consumption. Now, some of the road noise issues I have might be down to the tyre I use (Falkens) but it certainly isn't so bad that it spoils the fun, just be aware, and the grip on the road is so much better it more than makes up for it! Keeping the original rim as a spare means I also have to carry a spare set of OE wheel bolts.

Having fitted 16" alloys for summer use to my C1 (with 195/40x16) since 2011 I would agree with all of those comments wholeheartedly. The increase in roadholding & driving enjoyment is IMHO well worth the increase in road noise & fuel consumption.

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 Post subject: Re: Non standard tyres
PostPosted: Wed May 23, 2018 8:14 am 
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When you compare 155/65/14 with 145/65/15 on this site...

https://www.oponeo.co.uk/advice-and-tips/tyre-size-calculator

They don't recommended it. As it is recommended that you only use options within 1.5% and -2% and this is 2.18%

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2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84bhp
Electric Windows
Air Conditioning
Smart Radio 9
Panoramic Sunroof
Luggage Compartment Cover
Softouch Automatic Gear Programme
Bodypanels & Tridion Cell in Silver Metallic
15" Alloy Wheels


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 Post subject: Re: Non standard tyres
PostPosted: Tue Jun 12, 2018 2:48 pm 
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I found this interesting. My 451 has the design 1 alloy wheels shown here...

https://www.evilution.co.uk/index.ph...heels&mod=1087

The front rims are 4.5" in width and therefore according to the table here...

https://www.evilution.co.uk/index.ph...wheels&mod=585

The minimum front tyre width would be 145mm and maximum 175mm with the ideal being 155mm or 165mm.

I have 145mm fitted to mine instead of the 155mm fitted as standard but this table proves its ok.

I did wonder why some 450s had 145mm fitted as standard but this is because in those cases they had narrower rims then my 451s 4.5" to begin with see here...

https://www.evilution.co.uk/index.ph...wheels&mod=513

It seems when Smart updated the 450 to the 451 they increased the width of the front rims so that you could fit wider tyres and indeed fitted wider 155mm tyres as standard.

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2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84bhp
Electric Windows
Air Conditioning
Smart Radio 9
Panoramic Sunroof
Luggage Compartment Cover
Softouch Automatic Gear Programme
Bodypanels & Tridion Cell in Silver Metallic
15" Alloy Wheels


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PostPosted: Thu Jun 14, 2018 12:11 pm 
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Just wondering, those of you who run the 195mm tyres on either 15" or 16" inch wheels. What rim width are your 15" or 16" inch wheels and what ET offset do they have? Is there a set standard that everyone follows or does it differ?

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2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84bhp
Electric Windows
Air Conditioning
Smart Radio 9
Panoramic Sunroof
Luggage Compartment Cover
Softouch Automatic Gear Programme
Bodypanels & Tridion Cell in Silver Metallic
15" Alloy Wheels


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PostPosted: Sat Jun 16, 2018 9:36 am 
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Joined: Fri May 21, 2010 7:29 pm
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Location: South Molton
Drives: 2008 Citroen C1 Code
nlel wrote:
Just wondering, those of you who run the 195mm tyres on either 15" or 16" inch wheels. What rim width are your 15" or 16" inch wheels and what ET offset do they have? Is there a set standard that everyone follows or does it differ?

I have 6.5J x16 ET38 wheels with 195/40 x 16 tyres.

I run 10mm hubcentric spacers on the front to prevent rubbing the inner edge of the tyres on full lock but no spacers on the rear otherwise I get rubbing on the outside edge on bumps (might be less of a problem with a 3 door due to the lack of extra lip for the door in the rear wheelarch).

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