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-   -   Is Your Speedo Off Due To Tire Size? (https://www.nopistons.com/suspension-wheels-brakes-tires-21/your-speedo-off-due-tire-size-14582/)

turbovr6 03-28-2003 03:36 PM

While browsing tire rack I found this little bit of info, I gotta try this out https://www.nopistons.com/forums/pub...IR#>/smile.png





Follow the speed measuring instructions below:



1. Travel at a constant rate of speed on an open highway and have someone record the number of seconds it takes to travel exactly one measured mile.



2. On the chart, locate the number of seconds it took your vehicle to travel one mile. The speed indicated next to the number of seconds is the true average road speed of the vehicle.



3. Repeat the measurement several times and average the results. Recalibration of your speedometer is recommended if significant inaccuracy is noted.



Seconds Per Mile / Road Speed



50 72



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51 71



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52 69



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53 68



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54 67



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55 65



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56 64



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57 63



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58 62



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59 61



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60 60



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61 59



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62 58



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63 57



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64 56



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65 55.4



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66 54.5



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67 54



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68 53



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69 52

Sinful7 03-28-2003 03:37 PM

Nice... good post!

works2r 03-28-2003 04:16 PM

try this:



http://www.miata.net/garage/tirecalc.html

Turbo II 03-28-2003 05:58 PM

i need a min was 60mph


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