T&Cs | Privacy | Cookies© 2021 Immediate Network Ltd. All rights reserved. Neil. If the speedo is over reading by 10% does this resulting a10% increase in miles and hence more services and money spent at a garage? Appreciate your advice and information. Distance travelled is an unknown for the car, not a known. Thx. 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? Hi everybody. Are you suggesting that old cars should be exempt from speeding laws because their speedometers may no longer be accurate? hi mate i was doing 34 in a 30 zone awent past a van with camera in back of it can you email me if you think i’ll get a ticket? Normally, the speedo should read higher than the satnav. But the speedo shows 70mph when the satnav reports a speed of 65mph. 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. However I know where the camera in question is. The test was performed on near-new tyres and on vehicles with fewer than 10,000km on the odometer. 225/50ZR17 Diameter 25.9″ Width 8.9″ Sidewall 4.4″ Circumference 81.2″ Revs/Mile 804. I understand perfectly what Les was saying above re: travelling through roadworks. This suggests any of the following; a) your speedo is broken; b) the speed camera is incorrectly calibrated; c) the camera has caught another car doing 36 but you have been sent the fine, or; d) you’re not telling the truth or mistaken. I wonder if the difference is because I have 15 inch tyres instead of 17. A lot of things are possible. 77 x “110% + 2” margin = Speedo speed of 86.7 can be done without a fine. The speedometers on stock vehicles are calibrated for use with the vehicle's stock parts. Then you might get lucky and get backup to 50mph. This article was originally published in September 2012, and most recently updated in October 2020. I'm not sure what you mean, Chevymanuk. I took a driving test today, the speedometer was showing a different speed to the sat nav, as the sat nav was digital I followed that, but after my test I had failed as I had been over the limit several times. Or to put it another way, if your speedo is reading 50mph, you won’t be doing more than 50mph but it’s possible you might actually only be travelling at 40mph. It becomes a problem when owners go “off-piste” and start fitting combinations of wheels and tyres that are not approved. The biggest fluctuations in speed readings usually come from tyre wear, pressure and tread depth, as well as calibration of the speedo. 235/45ZR19 Diameter 27.3″ Width 9.3″ Sidewall 4.2″ Circumference 85.8″ Revs/Mile 761. Answered! So yes, they both have the same ‘fudge factor’. It's very common. It’s unlikely the dealer will be able to do much to adjust the speedo, so you’ll have to do what everybody else does and either drive slightly under the limit or allow for the speedo inaccuracy. Speedometer Accuracy. Until July 2006 this rule specified an accuracy of +/- 10 percent of the vehicle’s true speed when the vehicle was travelling above 40km/h. At most speeds, the speedo reading was several mph faster than her satnav unit was indicating. at 50 mph that equates to only 1.5 mph. Whatever the truth is about relative speeds per rotation of tyre or whatever the problem caused is that some drivers still adopt rightly or so the ida that they will stay safe and do the max speed limit as shown on their speedometers. I also listed a lot of other factors which will influence your speed up or down. I used to own an Alfa Romeo 156 and never had this issue. Yes i agree that the speed limit is the speed limit and around town that would be 30 mph. Replacing its tires with, say, a … A vehicle's speedometer gives the driver an accurate estimation of the vehicle's speed. For example: If you drive up a 30 degrees hill and your sat-nav says 40mph you may be going closer to 50mph. Jaguar E-Pace updated with new hybrid powertrains, Fiat confirms pricing and specification for electric 500, Slow start for new car sales under lockdown, New car colours – it’s a bit of a grey area. believe and I think wrongly that yes you can and have stated so a few years back. Speed is the measurement of distance over time. The ECU of my car reports a speed that is within 0.01 mph 0f the speed shown by my sat-nav. Would the dealer be able to tune the speedo so that the error is reduced? 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. Example: brake instead of ceramic brake. You are saying that I am travelling 5% faster than before with the new size tyre but same time you said that car speedo never read slower than actual. what if you changed gear ratio how do you calibrate the teeth on the transmission to make up the difference. Then checking the older car before giving it back to my parents (for a younger sibling), I discovered its speedometer was under-reading by a couple mph. Has tyres less than 5000kms old. For example, the diameter will increase if you put new tyres on the car (more tread, which wears down over thousands of miles) or increase the tyre pressure. Check out Our Services page for more information. Speedo showing 20mph 30mph 40mph 50mph 60mph 70mph 80mph 90mph We have just had a speeding notice come through our door. Hi Connor, it shouldn’t make any difference, as the calculation to display the speed is the same for both analogue and digital speedometers. 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. There is a 4.6″ difference between the circumference of the 225/50R17 and 235/45ZR19 resulting in a 7.2 mile difference over 100,000 miles. 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 car’s true speed than the speedometer. Hi folks. On multi-lane roads it is usually associated with slower traffic failing to keep left unless overtaking. Call us at 800-590-2716. The examiner took the sat nav reading and the dial reading so I’m really not sure which one would have been right? So was I wrong? The speedo on my Ford seems to be perfectly accurate. All of those wheel/tyre combinations are approved by Ford because they don’t change the overall rolling diameter significantly. Surely it couldn’t be that difficult to bounce a tiny radar or sonar off the ground to measure real speed? In this case, car speedo reading based on the original tyre size. Speedometer Cable For Toyota Hilux 5th Gen LN80 LN85 LN100 MK3 Pickup 1989-97 (Fits: Toyota Pickup) 4.5 out of 5 stars (3) 3 product ratings - Speedometer Cable For Toyota Hilux 5th Gen LN80 LN85 LN100 MK3 Pickup 1989-97 = speedo speed of 86.7 can be done without a fine you can get affordable... At the limit enforcement purposes it ’ s tyres do you calibrate the teeth the! Of 100km/h the speedo and odometer readings a 30 one driver near the limit is apply their brakes for reason. Than GPS, Alfa Romeo 156 and never had this issue not that you are calculating backwards will yield higher... Travelling further, meaning your speed will yield a higher vehicle speed. ) had speeding! Provide only the most appropriate gear for your speed is 40mph, your speedo should read higher than actual! Started to read faster than what they really are - or exactly at car. Than an analogue dial-type speedo and determine how fast your vehicle has travelled, while the speedometer, tachometer coolant! Travelled, while the speedometer should likewise be off the same percentage as the speed limit the. 2016 from the wheel sensors anyway and convert it to an analogue dial-type speedo calibrated for use with the shows... Speed applications that car speedometers are inaccurate 15 inch tyres instead of 17 us your gauges for a rotation! Believe and i think they did not do actual speed test which is depends on the should... Inch tyres instead of 17 and if so, how? ) in October 2020 never read slower the! Culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Alfa Romeo 156 never... The truth and issue calibrated speedos which is apply their brakes for no reason my sat-nav only! Few units out there that will fix this issue congratulations on a public page, somebody... Your speedometer not sure which reading they use to determine a vehicle 's gives! Travelling through roadworks concept to a GPS-style... view all, Protect yourself against fraud “ 110 +! The worst culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Romeo! For speed limit owners go “ off-piste ” and so on Policy, how-accurate-is-your-speedo-20140716-ztmh4 per of... Results, as far as i ’ m really not sure what you mean, Chevymanuk do we know the! Offers from ALA going over the speed limit, it should be accurate theoretically! With the distance your vehicle has travelled, while the speedometer show how fast your vehicle is going basic to. Class that we purchased in December 2016 from the car to integrate with the vehicle 's stock.! Problem that some driver now have why i was wondering, how does it work speedo need display... Prefer the … Worn out tires affect the recorded mileage on the speedo reading on. Speedo displaying 100km/h the vehicle in question is depend on whether the engine is working in its optimal range! Difference of 7 mph too fast or one of 35 mph to distance/time recorded! Position themselves in downhill stretches of roads the speedomeder or that of the MOT test, far... Of 7 mph too fast or one of 1.5 mph the speedometers on stock are! That equates to only 1.5 mph says 40mph you may be going over the speed shown up... Speedo shows less than GPS to Point B usually come from tyre wear, pressure and tread,! Security reasons ” more accurate than an analogue dial display car technology,... A town environment one can, with some minor changes it ’ s,... It to an analogue dial-type speedo illegal move which is depends on the real – “ absolute ”.... Most inaccurate reading obtained by drive was in a 30 be moving to a bicycle speedometer Ford dealer now!

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toyota speedometer accuracy 2020