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sid Member Since: 16 Jul 2015 Location: devon Posts: 501 ![]() ![]() ![]() |
i checked my speedo with the phone sat nav speed and was quite suprised how accurate the cars speedo is,its within 1 mph or less. 2009 hse td4e manual,18 inch wheels. |
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Lightwater Member Since: 21 Aug 2014 Location: Sydney Northern Beaches Posts: 4926 ![]() ![]() ![]() |
What size piece of rubber do the 18 inch rims have? Procrastination, mankind's greatest labour saving device!
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BossBob Member Since: 30 Sep 2010 Location: Bristol Posts: 1449 ![]() ![]() ![]() |
Indicating 2mph slow error at 20mph wipes out the allowed 10% error for speeding calculations, you’ve only got the “grace” allowance and that changes by police force! |
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Lightwater Member Since: 21 Aug 2014 Location: Sydney Northern Beaches Posts: 4926 ![]() ![]() ![]() |
What I have noticed over the years is a fairly consistent kph difference regardless of speed.
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Nodge68 Member Since: 15 Jul 2020 Location: Newquay Posts: 2086 ![]() ![]() ![]() |
My SE with 17" wheels is pretty accurate at 70, when the phone nav shows 70 MPH, the car speedometer shows 72 MPH. I suspect it would be close to spot on if the tyres were new. Hyundai Ioniq 5 Ultimate. The family car. 2009 Rimini Red SE TD4. Gone. 2006 Tonga Green i6 HSE. Gone. Audi A5 convertible, my daily driver. 1972 Hillman Avenger GT, the project. |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3219 ![]() ![]() ![]() |
My speedo is always 2 mph optimistic as shown on my separate SatNav, and confirmed by these roadside 'flashing' signs.
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Lightwater Member Since: 21 Aug 2014 Location: Sydney Northern Beaches Posts: 4926 ![]() ![]() ![]() |
I would have put 245/70r17 on the car, but at the time to replace the 18 inch poodle rims with 17 inch & buy a second spare was not worth the price, so just have to be a bit more careful on corrugated rock strewn roads. Still reasonably happy with the 255/60r18. I have 2 spares for the car when traveling in the outback.
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sid Member Since: 16 Jul 2015 Location: devon Posts: 501 ![]() ![]() ![]() |
235 60 18 |
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