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Sat-Nav Speed Read Out.
tickmike:
Putting smaller alloys on our New car makes the car speed reading 5mph slower than should be, any tips for getting a good reliable speed reading from the 'TomTom 620 Go' sat-nav ?. eg not driving under trees when taking a reading.
jelv:
Haven't you got that the wrong way round? With smaller wheels the car speedo will be reading faster than your actual speed - and it will be a percentage not a fixed 5mph.
I found monitoring and remembering what the car speedo said on a dual carriage way or motorway when driving at a constant 50, 60, 70 as reported by the sat nav the best way.
d2d4j:
Hi
I hope you don’t mind but I think you both are wrong or right as there is not enough information to decide
If changing alloys to different size (16” to 15” or visa versa), but fitting correct tyre to each, so the overall wheel size remains same, then there should be no difference in speed
Also, sat nav are not calibrated so the speed cannot be relied upon as an accurate speed measurement
Many thanks
John
d2d4j:
Oops sorry, one more point, you must inform insurance company off any changes or you could void your insurance
Many thanks
John
tickmike:
Buying a new Vauxhall Mokka X, Wheel size 215x60x17" 96H.
I found out after we had paid for the car, the road wheel will not fit in the 'Wheel Wheel' in the boot. :no:
For the spare, I bought a 16" steel wheel and fitted a 215x55x16" 96H tyre and that fits in the wheel well and is a H (130MPH) rated tyre.
Just think you have 4/5 people in the car with a boot full of luggage you get a flat, change it for the spare what are you supposed to do the the road wheel, ask your passengers to have it on there nee ;D :(
Vauxhall CEO is going to get an email soon from me. >:D
So I bought 4 new 16" alloys and they now will fit in the wheel well.
Using this on-line tool http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
Says 2 MPH slow at 30MPH, I am getting 5 MPH slow against the sat-nav. !
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