Igor the Aygo

[Arrow]

Have you tried bigger front tyres? In bigger i mean bigger diameter, this will lower your rpm at cruising speeds.

Also the aygo has a rear fenders which are almost designed to rear wheel skirts.

[Sykomor]

Originally Posted by Arrow

Have you tried bigger front tyres? In bigger i mean bigger diameter, this will lower your rpm at cruising speeds.

Also the aygo has a rear fenders which are almost designed to rear wheel skirts.

Skirts are on the drawing board.

I'm just about to order winter tyres but can't decide between the original 155/65-14 or the 5% bigger 175/65-14. It would lower rpm but 175mm is a lot wider. I could also try to find 4'' narrow 15'' rims to fit some 135/70-15. Suggestions are more than welcome.

...Hm, wonder if the Yaris 15'' tyres would fit...

[Arrow]

Bauhaus hardware store sells 2-side outdoor tape (Dubbelhäftande monteringstejp). The tape claims "permanent and steady attachment without screws".

I would first try a rear wheel skirt proto with this tape and some peace of plastic, in Aygo it really looks that simple to do. And when you get the results, then make a more permanent installation. But this could be the easy & fast solution to get the data.

Before the 2-side tape loses it's grip you'll have enough info.

[Arragonis]

If you have lowered the car then larger tyres may hit something ? Not sure, but I have read about kids fitting 15s to their cars and having issues.

EDIT - it may have been 16s with wide tyres...

Also not convinced gearing is going to solve the FE at speed balance - you still have to push the throttle to maintain speed and in a higher gear the push is for longer.

I've started using a version of "LOG" without the "engine off" part. Will see how this goes.

[Sykomor]

Originally Posted by Arragonis

The language is fine.

What does your insurance say about mods like lowering ? If I do that here they want mega £s extra and one of the savings with George is the lower insurance - I'm aiming for £150 instead of the £375 the fabia was costing me.

Hopefully my front grill will be blocked this PM, after usual family stuff of Sunday mornings...

I got an answer from the insurance company (Länsförsäkringar): The lowering does not affect insurance cost.

[Arragonis]

Good news!

[Sykomor]

I had a good tank (65.35) but not as good as it seems. I "added" a factor 1.046 to the miles as according to several gps-navigator tests show that I actually get 4.6% longer than the odometer indicates. I have calibrated the UltraGauge accordingly.

Away to test bigger wheels and planning for kammback...

[Arragonis]

What type of roads (urban, highway, motorway) and what % do you typically drive ? I at most do 50:50 urban and busy bypass - motorway.

[Sykomor]

Originally Posted by Arragonis

What type of roads (urban, highway, motorway) and what % do you typically drive ? I at most do 50:50 urban and busy bypass - motorway.

Ideal actually. Speed limit 70km/h (43mph) some 80 km/h (50mph) and a very small part 90 km/h (56mph) The last km is citytraffic. I can very much choose what kind of driving I want. A bit hilly at parts though. I also have a few stop signs, and one stopsignal if I'm unlucky.

[Sykomor]

I just tried the wheels from a Yaris: 185/60-15 and they almost fit (108,1% diameter). That means I can have the bigger diameter I want and go up to at least 175mm width. In Sweden it is not illegal to have 5% larger diameter.

I'm thinking Nokian Hakkapeliitta R

100% 155/65R14 75 R
107,9% 175/70R14 88 R XL (almost legal)
104,7% 175/65R14 86 R XL
110,4% 185/70R14 92 R XL (illegal)
106,8% 185/65R14 90 R XL (almost legal)

If I can find some 15'' rims there's also:
109,1% 175/65R15 88 R XL (illegal)

Which should I choose? I would very much like the Hakka but there's also other makes.

105,3% 165/70R14 Kumho, Hankook, Sava, Fulda, Dunlop…


This tyre size calculator is really good by the way: rimsntires.com/specs.jsp

Help me choose.