General Tyre size

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General Tyre size

Steve Selvage

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Feb 10, 2024
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I have a 500 lounge arrive with new Bridgestone 185/65/15 tyres on the back and 2 knackered 185/55/15 on the front.
Can I fit a couple of new 185/65/15 on the front and have a matching set or should I buy all four of the correct size?
Is it ok to have bigger tyres on a 500?
 
More or less every car I've had for the last 10 years or more has had a speedo that doesn't correspond to GPS.

The speedo always says I'm driving slower, I figured it was the manufacturers way of trying to make people slow down. Or maybe the GPS isn't so accurate.
2019 Panda speedo is over 10% inaccurate at 30mph and gets worse as the speed rises, and always has been from new. Its just a good thing it MASSIVELY over reads not the other way around. Just another example of Fiats near enough is good enough approach. I wonder of their accountants have the same methodology. lol. The mpg looks even worse when you take into account its actually been going much slower than you thought.
 
That's between you and your insurance company to decide.
But generally would be a problem for a typical car, and only supercars have larger tyres on the rear, like the fiat F40
I have never had an objection to any of this sort of minor mod from insurance, nor any extra charges. There is no doubt that if they know they will use it as an escape route if they find out. I have always told the insurance, and must have done so over twnty times. Not once have they even responded. I have only once had an assessor look at a car, and the only ting he did was to note the milage and measure the tread depth of all the tyres very very carefully! Its one big reason to avoid getting close to the legal wear limit. 2.0mm is tha bare minimum.
 
I believe they deliberately under-quote the speed because an accurate speedo would no doubt be more expensive and that gives them a bit of leeway; a couple of k's either way won't be noticed. My car's speedo reads 5kph slow at 100kph but I have a GPS HUD and it's spot-on. A Mazda 2 I drove once had an inbuilt HUD but it wasn't GPS so the speed data was still several kph under the actual. 🙃
A couple.... more like 12 at 70mph. One day I will be booked for obstruction on the motorway!
 
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