So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph. I’m not advocating doing this, but it’s interesting to know where you stand, until the rules, or the accuracy of cars’ speedos change. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. So I did a few calculations and it surprised me how little it did affect the readings. I think they did not do actual speed test which is depends on tyre size. How do we know that the satnav is accurate? It was a completely standard car. The speedometer may be calibrated for the 14" wheels.... or it could just be that Toyota set it to show higher than it is actually going to keep you from getting tickets. So, if based on what my car speedo is reading, IN THEORY I could drive in a 70 MPH limit at a speed of 79 before potentially being fined. When it comes down to whether the Toyota Highlander has a digital speedometer or analog speedometer, it seems as if, right now, the company is sticking to the traditional analog model. Call us at 800-590-2716. Read More I used the sizes from the 225/50R17 and 235/45ZR19 as thats where the largest size difference in circumference/revs per mile: Speedometer error between 225/50R17 and 235/45ZR19 If it's over-reading it's not really a problem as you're not likely to be going over the speed limit. They are also inherently more accurate at higher speeds, as a larger distance over time reduces rounding errors, but a satnav will usually be much closer to a carâs true speed than the speedometer. Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. The speedometer is overeading (? All cars fell within the parameters of an Australian Design Rule that requires that the speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount of more than 10 per cent plus 4km/h. I wonder if the difference is because I have 15 inch tyres instead of 17. Hi Daijudo. Could you advice me what to do now, how I can get actual speed test report to prove that tyre size is affecting to the actual speed? I am aware that EU law requires that speedometers never under-read but they can over-read by up to 10 per cent + 6.25mph. The test was performed on near-new tyres and on vehicles with fewer than 10,000km on the odometer. Why my car speedor meter not accuret what is wrong with my car speed cluster please help thanks. What we and drivers need to know is what is right as both of them cant so its got to be one or the other and a new direction should be given by the Police as to exactly where we stand. The roadside digital signs that show your speed are purely for information purposes and can’t be used for speed limit enforcement purposes. Read about our Security Policy Many other drivers have reported the same thing over the years, and this situation is actually common to nearly every car on the market. As said Tailgating is now the preferential position, like sheep nose to tail not really seeing where they are going and of many driver and its getting to epidemic proportions. It might be because of tyre size, now tyre bigger than original and speed sensor connected with wheel size rotation not tyre size rotation, so error might happen. In close proximity to the vehicle in front there is less of a chance that you are seen by other drivers turning or pedestrians crossing and therefore putting oneself and other road users in a dangerous position. 13355 Lake City Way, N.E., Seattle, WA 98125. In order to correct this, you can install an In-Line Speedometer Calibrator. However, if the diameter of the wheel/tyre alters, the extrapolation calculation will be incorrect. But car driver thinks you are speeding and then does an illegal move which is apply their brakes for NO reason. To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount. Joined: May 19, 2018 Member: #15447 Messages: 967 Gender: Male First Name: Ian Charlottetown, PE, Canada Vehicle: 2012 Toyota Sequoia Platinum Bilstein 5100 2.3/1.5, TRD sway bars ft/rr, Cooper Tires Discoverer AT3 XLT 295.70.18, Vision Manx 2 18x9 +12, APS side armor steps, TRD-Pro Grill and Bulge, de-chromed, blackout emblems, OEM mirror caps and flares, TRD shift â¦ Fitting different size tyres will affect it though as you have stated because then you’re actually changing the length of the rubber on the outside of the tyre. However, there are other factors which will also affect this, such as tyre pressure, rolling resistance, increased drag and so on, so there’s no guarantee you are going any faster on the new tyres than you were with the old ones. Policy, how-accurate-is-your-speedo-20140716-ztmh4. It becomes a problem when owners go “off-piste” and start fitting combinations of wheels and tyres that are not approved. So, if I’ve understood correctly, the speed limit is the REAL one,”an absolute,” not the one on most speedometers, which OVERREAD by around 10%, at least it does on my present ’08 Civic, if I check it against the roadside flashing lights, and the satnav on a mobile phone. Several years ago The Chief of Police Officers, then known as ACPO. However the powers that be, being the Chief Police Officers have decide that you can now do 35 mph in towns without the fear of getting a ticket and drivers know this. GAP insurance and warranty offers from ALA | Warranty offers from Warrantywise | Sell your car with Motorway | Cars for sale from Carsnip, Award-winning, independent and impartial advice on buying, owning and running a car, We compare reviews from 25 motoring websites to bring you a definitive rating for every new car, All the most important new car launches, model updates, car reviews and industry news, Our commercial partners bring you exclusive offers on their products and services, Car buyingCar financeCar ownershipCar insurance, Latest ratingsTop-rated carsTop-rated SUVsAll ratings, About usMedia appearancesPartnersAdvertising, The Van ExpertThe Truck ExpertCommercial Vehicle EngineerImmediate Network. 82.7″ Revs/Mile 789 235/45ZR19 diameter 27.3″ Width 9.3″ Sidewall 4.2″ Circumference 82.7″ 789. The readings i can find it have over 100,000 clusters in stock and ready to ship a difference 43... 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