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My rapid now

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Looks great and pleased you managed to grab those wheels.

 

 

TP

  • Author

I would like to lower but other half not like say to bumpy not good for her back after op

Great bargain! And top looks.

looks good ;<)

Oh and mind tell your insurance folk ;<0

They look very nice and a bargain but need a bit of droppage :x

Looks great :)

Looks fantastic! :happy:

Edited by RapidTrev

If the wheel/tyre size has been changed from the OE fitment, you might want to check the accuracy of the speedometer - it may require recalibrating.   The easy way to see is to check it against a GPS sat nav - as long as it's not wildly out, then there's no problem!   ;)

Your car does look good with the "Sport" wheels! 

If the wheel/tyre size has been changed from the OE fitment, you might want to check the accuracy of the speedometer - it may require recalibrating.   The easy way to see is to check it against a GPS sat nav - as long as it's not wildly out, then there's no problem!   ;)

Your car does look good with the "Sport" wheels! 

Can speedo be recalibrated against "larger wheels" i.e. is it electronic/software

Can speedo be recalibrated against "larger wheels" i.e. is it electronic/software

 

No don't think this is something the dealer could do; set at the factory.

 

However there is only 2.4mm difference in circumference between the OEM 15" tyre and the 17" or 0.09mph.

 

 

Oh forgot to say that our new Spaceback with factory fit 17" wheels, appears currently to indicate on the speedo 1mph more than the readout on our Garmin; closest match I've had so far from a car.

 

 

TP

Can speedo be recalibrated against "larger wheels" i.e. is it electronic/software

A competent dealer can do it in just a few minutes by measuring the circumference of the tyre, dividing by 5280 (that's how many feet are in a mile) which gives the revolutions per mile the new tyre will turn.  The technician can program this into the ABS module using the manufacturer's software tool.

 

 

When I worked for the Post Office, I was given an old, ropey Peugeot as my first company car while I awaited my new one on order.   I overtook a police car at what I thought was 65 mph on the M25 and took umbrage when he overtook, cut in front and braked.   As soon as I passed him again, the PC pulled me over.   It became clear that when I read 70 mph on the speedo, I was actually doing between 80 and 85 mph.   When I took it to the GPO workshops nexd day, it turned out that the wheels and tyres had been changed after an accident and were a different size from the OE.   They calibrated the speedo correctly within ten minutes.

Edited by bealine

 

 

However there is only 2.4mm difference in circumference between the OEM 15" tyre and the 17" or 0.09mph.

 

 

 

 

However there is only 2.4mm difference in circumference between the OEM 15" tyre and the 17" or 0.09mph.

 

 

If you use the tried and trusted mathematical theorem to calculate the circumference (Circumference = Pi (3.14) times Diameter (C=pD) ) , then there is a difference of 159 mm at the wheel rim.

Even allowing for the low aspect ratio of the 17 inch rim fitment tyres, I would expect the circumference to be a bit greater than 2.4 mm - not quite sure where you're getting your info from.   (That would indicate that the diameter of the 15 inch standard fitment and the 17 inch low profile fitment have almost identical sizes once the tyres are fitted - which clearly isn't the case as popular opinion states that the 15 inch wheels seem too small for the car!)

There's no harm in the OP checking his speedo against a GPS sat nav to satisfy himself that its accuracy is within tolerances.    

 

The insurers also need to be advised of the wheel change as, even though they are a Skoda product, they are not the original fitment.   Most insurance companies will invalidate the policy, following an accident, if they are made aware of any modifications - they are particularly twitchy about wheel changes, largely because of the desireability to the car thief, the differnce in handling characteristics and the potential for speedometer inaccuracy!

Edited by bealine

  • Author

If you buy a sports pack or a style pack do you have to notify insurance. If a sport pack i comes with these wheels  (some silver)

Even allowing for the low aspect ratio of the 17 inch rim fitment tyres, I would expect the circumference to be a bit greater than 2.4 mm - not quite sure where you're getting your info from.   (That would indicate that the diameter of the 15 inch standard fitment and the 17 inch low profile fitment have almost identical sizes once the tyres are fitted - which clearly isn't the case as popular opinion states that the 15 inch wheels seem too small for the car!)

 

http://www.carbibles.com/tyre_bible_pg4.html

 

 

 

TP

If you buy a sports pack or a style pack do you have to notify insurance. If a sport pack i comes with these wheels  (some silver)

 

My insurers asked if the car had factory options, so I told them it had the sport pack, two phone calls later they still hadn't got their heads round it and we left it at that, as they didn't seem overly bothered anyway.

 

 

TP

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