I know there are multiple threads regarding tyres and I have tried to read through them to get the information I need but cant seem to get a definitive answer.


I have a Panda 100HP (standard 100HP suspension) with 195/45 15 tyres and I want to replace them with winter tyres now before the prices go up, yes I live in the North of Scotland, I'm expecting bad weather. The problem is, I cant source any winter tyres to fit my exisiting rims. I am unsure if I can put 195/50 15 onto them.

My questions are these;

a) will they fit as a direct replacement on my existing rims?
b) will this have any impact on braking?
c) will the change have any impact on speedo readout?
d) when I inform my insurance company of the non standard tyre size will it cost me?

Thanks for reading.

jonro99 said:

c) will the change have any impact on speedo readout?

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This link will help with that question. Sorry to be next to useless: but I've driven far too many miles today, and my brain is still somewhere on the M6....

I'm sure someone more awake than me will be along momentarily... :idea:

Thanks

Seems there is a litttle effect on the readout. maybe a set of cheap rims and tyres are the way forward.

I run 195/50s on mine with no issues, have done for about 3 years now

So I could just put the tyres on the standard rims then? I know they will fill the arch a little more.

Any ideas on the best place to get green stuff brake pads?

jonro99 said:

So I could just put the tyres on the standard rims then? I know they will fill the arch a little more.

Any ideas on the best place to get green stuff brake pads?

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Straight fit, I have pictures on here of mine so you can see how much they fill the arches.

thanks, i'll have a look

Car looks good. Looks well done. The tyres look good in the arches. Thats the answer I needed cheers!

BTW I did the same thing to my old Corsa on an icy road just like the one on your picture. Slid straight into a kerb at full lock....bad times!

I never understand why the sport 100hp run a 195/45R15 tire, witch is 3.75% smaller then the standaard 155/80R13" tire for all other Panda's.
A 195/50R15" is a much better fit to the 155/80R13", it is just 0.38% smaller.
Wonder what the speedo reed out is on a 100hp compare to a GPS unit.

The Pretender said:

I never understand why the sport 100hp run a 195/45R15 tire, witch is 3.75% smaller then the standaard 155/80R13" tire for all other Panda's.
A 195/50R15" is a much better fit to the 155/80R13", it is just 0.38% smaller.
Wonder what the speedo reed out is on a 100hp compare to a GPS unit.

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I think it’s a weight/acceleration issue - you’ll probably find that the smaller rims & tyres weigh-in at less than the other options. The trend for big rims & chunky tyres may `look-good’ but has a negative effect on acceleration. Check-out the weight of your short-list of tyres – some (e.g. Conti) can be significantly lighter in weight size-for-size than competitors.

120929

In response to the question about speedo vs GPS, it's massively out. My speedo says about 77mph when the GPS is at 70mph..

I don't understand why the 100HP's overall diameter needs to be the same as any of the other models. Assuming the speedo pick-up's not actually on a drive shaft, but taken off the gearbox, the speedo would have to be recalibrated/re-programmed anyway, given the difference in final drive ratios. I'd be interested to see how much difference the inertia of the wheel/tyre combination has on the car's acceleration - my guess is it's minimal in practice - as opposed to in theory when you could consider making a wheel pick up speed much more quickly than would be possible on the car - I'd bet it's far less than the effect of a couple of gallons of fuel in the tank.

The handbook specifies the rim and tyre size for winter tyres.

If you fancy exercising the little grey cells, try some maths (posted about this before, a couple of years back)

A new tyre has tread that is 8mm deep. When worn to the legal limit, it only has 1.6mm of tread. This means a difference of over 14mm diameter beween a new tyre and an old one, meaning a new tyre will cover more road distance for a given rotation of the drive shaft than an worn tyre will. That will make a few percent difference on the speedo reading – often more than a subtle change in tyre size/specs – and is why they are rarely accurate when compared to GPS.

Dan Friel said:

In response to the question about speedo vs GPS, it's massively out. My speedo says about 77mph when the GPS is at 70mph..

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And that 10% is a software programmed feature