Lost formula to calculate the actual miles after adding larger tires.


Can someone post it for me....


Thanks in advance

I like this site for converting tires and seeing what the % differences are:



www.dakota-truck.net/TIRECALC/tirecalc.html



and



www.miata.net/garage/tirecalc.html

Try this. It is a section of a Microsoft Excel spreadsheet. To use it, you can change any of the figures EXCEPT the bold numbers. Here you give your axle ratio, final drive gear ratio, desired MPH and engine RPMs and the product is the tire diameter you'll need.


Hope it works here otherwise you may be able to stubby pencil it.






<TABLE style="WIDTH: 450pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=597 border=0 x:str>
<COLGROUP>
<COL style="WIDTH: 88pt; mso-width-source: userset; mso-width-alt: 4278" width=117>
<COL style="WIDTH: 64pt; mso-width-source: userset; mso-width-alt: 3108" width=85>
<COL style="WIDTH: 95pt; mso-width-source: userset; mso-width-alt: 4608" width=126>
<COL style="WIDTH: 85pt; mso-width-source: userset; mso-width-alt: 4132" width=113>
<COL style="WIDTH: 9pt; mso-width-source: userset; mso-width-alt: 438" width=12>
<COL style="WIDTH: 56pt; mso-width-source: userset; mso-width-alt: 2706" width=74>
<COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2560" width=70>
<T>
<TR style="HEIGHT: 15.75pt" height=21>
<TD =xl29 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; WIDTH: 397pt; BORDER-BOTTOM: #e0dfe3; HEIGHT: 15.75pt; : black; mso-ignore: colspan" width=527 colSpan=6 height=21>Calculate Required Tire Size to Achieve Desired Engine RPMs</TD>
<TD =xl31 style="BORDER-RIGHT: windowtext 1pt solid; BORDER-TOP: windowtext 1pt solid; BORDER-LEFT: #e0dfe3; WIDTH: 53pt; BORDER-BOTTOM: #e0dfe3; : black" width=70> </TD></TR>
<TR style="HEIGHT: 15pt" height=20>
<TD =xl35 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: windowtext 1pt solid; BORDER-BOTTOM: #e0dfe3; HEIGHT: 15pt; : silver" height=20>Target</TD>
<TD =xl24 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver"> </TD>
<TD =xl24 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver"> </TD>
<TD =xl27 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver">Transmission</TD>
<TD =xl24 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver"> </TD>
<TD =xl24 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver"> </TD>
<TD =xl36 style="BORDER-RIGHT: windowtext 1pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: #e0dfe3; : silver">Engine</TD></TR>
<TR style="HEIGHT: 15pt" height=20>
<TD =xl37 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: windowtext 1pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 15pt; : silver" height=20>Tire diameter =</TD>
<TD =xl26 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: windowtext 0.5pt solid; : silver">MPH x</TD>
<TD =xl25 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: windowtext 0.5pt solid; : silver">Rear-end ratio x</TD>
<TD =xl26 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: windowtext 0.5pt solid; : silver">ratio x</TD>
<TD =xl25 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: windowtext 0.5pt solid; : silver"> </TD>
<TD =xl26 style="BORDER-RIGHT: #e0dfe3; BORDER-TOP: #e0dfe3; BORDER-LEFT: #e0dfe3; BORDER-BOTTOM: windowtext 0.5pt solid; : silver">336 /

Stubby pencil it is. . . .