Katsastus question...

radosl81 · Post by **radosl81** » Sun May 29, 2011 10:02 am

thanks....

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MikeD · Post by **MikeD** » Sun May 29, 2011 11:23 am

At the very least you'll need to do a muutoskatsastus (=the new tire/wheel combo is checked at the katsastus) unless there are alternative (bigger) sizes already mentioned on the documents - take a look at the bottom part of the registration document. However, if the sizes you mentioned are correct and no alternative sizes are listed you might have a problem, as the difference in diameter (assuming I have my maths right) is quite big. Go to the katsastus place and ask them.

radosl81 · Post by **radosl81** » Sun May 29, 2011 12:59 pm

MikeD wrote:At the very least you'll need to do a muutoskatsastus (=the new tire/wheel combo is checked at the katsastus) unless there are alternative (bigger) sizes already mentioned on the documents - take a look at the bottom part of the registration document. However, if the sizes you mentioned are correct and no alternative sizes are listed you might have a problem, as the difference in diameter (assuming I have my maths right) is quite big. Go to the katsastus place and ask them.

The difference in diameter is only 9 mm. I checked, but no alternative sizes mentioned in the document. Then, i have to pay extra for a muutoskatsastus or what?

MikeD · Post by **MikeD** » Sun May 29, 2011 1:27 pm

radosl81 wrote:
MikeD wrote:At the very least you'll need to do a muutoskatsastus (=the new tire/wheel combo is checked at the katsastus) unless there are alternative (bigger) sizes already mentioned on the documents - take a look at the bottom part of the registration document. However, if the sizes you mentioned are correct and no alternative sizes are listed you might have a problem, as the difference in diameter (assuming I have my maths right) is quite big. Go to the katsastus place and ask them.

The difference in diameter is only 9 mm. I checked, but no alternative sizes mentioned in the document. Then, i have to pay extra for a muutoskatsastus or what?

So my maths was not correct.

You'll need muutoskatsastus because of the size of the wheels though. Should be a straightforward process, and it'll cost you along the lines of 50 euro.

Talvenloppu · Post by **Talvenloppu** » Wed Jul 13, 2011 12:55 pm

In my experience it is not necessary to have Katsastus twice a year: after each tyre change. Katsastus is required to be done only once a year. If the vehicle is modified in some significant way then I imagine it should should have Katsastus as it would be a different car.

AldenG · Post by **AldenG** » Wed Jul 13, 2011 8:58 pm

Is it an issue that the change affects the speedometer by about 13% or 9%, depending on which direction you look at it?

makaveli · Post by **makaveli** » Thu Jul 14, 2011 8:05 am

AldenG wrote:Is it an issue that the change affects the speedometer by about 13% or 9%, depending on which direction you look at it?

I understand this statement, but speedometers on brand new cars are also calibrated with a margin of error from the factory, I.E the speed displayed is greater than actual speed, so even then it is technically "wrong".

Are there rules regarding wheel size changes? of course there are often physical limits on certain cars i.e arch, caliper clearing distance. Wouldn't they just check the state of the tyres and not scrutinise the wheel size itself (unless it looks like a tractor and is obviously too big for the application)?

MikeD · Post by **MikeD** » Thu Jul 14, 2011 8:51 am

makaveli wrote:
AldenG wrote:Are there rules regarding wheel size changes?

Yes. 1" bigger/smaller than what's on the registration documents is OK, more than that -> muutoskatsastus.

makaveli · Post by **makaveli** » Thu Jul 14, 2011 12:12 pm

MikeD wrote:
makaveli wrote:
AldenG wrote:Are there rules regarding wheel size changes?
Yes. 1" bigger/smaller than what's on the registration documents is OK, more than that -> muutoskatsastus.

what are they checking in this case? Surely someone could replace the existing wheel/tyre combo with like for like items with bald tyres and/or bent rim and not realise and not be obliged to have a check.

Upphew · Post by **Upphew** » Thu Jul 14, 2011 12:34 pm

makaveli wrote:what are they checking in this case? Surely someone could replace the existing wheel/tyre combo with like for like items with bald tyres and/or bent rim and not realise and not be obliged to have a check.

Tyres are part of the suspension, you don't just waltz in and change suspension...

makaveli · Post by **makaveli** » Thu Jul 14, 2011 12:44 pm

Upphew wrote:
makaveli wrote:what are they checking in this case? Surely someone could replace the existing wheel/tyre combo with like for like items with bald tyres and/or bent rim and not realise and not be obliged to have a check.
Tyres are part of the suspension, you don't just waltz in and change suspension...

you could, suspension compenents can be upgraded wtih ease, OEM offers upgrades with stiffer settings etc i.e sports or comfort specs. then theres the world of aftermarket..

Mook · Post by **Mook** » Thu Jul 14, 2011 3:13 pm

radosl81 wrote:Now i'm with the summer tyres wich are 265/45/20. Is it a problem?

yes, it's a problem. 20" rims look stupid on most cars and with those low profile tires will give you a bad back. And don't even think about driving to the mökki...

radosl81 · Post by **radosl81** » Fri Jul 15, 2011 5:44 pm

MikeD wrote:
makaveli wrote:
AldenG wrote:Are there rules regarding wheel size changes?
Yes. 1" bigger/smaller than what's on the registration documents is OK, more than that -> muutoskatsastus.

1" in outer diameter of the tyre or of the rim?

Upphew · Post by **Upphew** » Fri Jul 15, 2011 5:51 pm

radosl81 wrote: 1" in outer diameter of the tyre or of the rim?

Rim. I'd guess that changing the tyre would eff up the speedometer.

radosl81 · Post by **radosl81** » Fri Jul 15, 2011 5:53 pm

Mook wrote:
radosl81 wrote:Now i'm with the summer tyres wich are 265/45/20. Is it a problem?
yes, it's a problem. 20" rims look stupid on most cars and with those low profile tires will give you a bad back. And don't even think about driving to the mökki...

Do you think that, look stupid?

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