<HR style="BACKGROUND-COLOR: #c7e2f0; COLOR: #c7e2f0" SIZE=1>check this site before changing tyre and rim.Tire Size Calculator - tire & wheel plus sizing<FORM method=post name=tirecalc action=TireSizeCalculator.asp?action=submit><CENTER><TABLE style="BORDER-COLLAPSE: collapse" border=1 cellSpacing=0 borderColor=black cellPadding=4 background=images/spacer.gif><TBODY><TR bgColor=#d3d3d3><TD>Stock Tire - 145/70R12 >Search Tires </TD><TD>Tire 2 - 155/70R12 >Search Tires </TD><TD>Tire 3 - 165/70R12 >Search Tires </TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Section Width: the width of a tire; the width at its widest point from sidewall to sidewall.';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Section Width:</TD><TD width=80 align=right>5.70 in</TD><TD align=right>145 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Section Width:</TD><TD width=80 align=right>6.10 in</TD><TD align=right>155 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Section Width:</TD><TD width=80 align=right>6.49 in</TD><TD align=right>165 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Rim Diameter: height of the wheel this tire will fit on';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Rim Diameter:</TD><TD width=80 align=right>12 in</TD><TD align=right>304.8 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Rim Diameter:</TD><TD width=80 align=right>12 in</TD><TD align=right>304.8 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Rim Diameter:</TD><TD width=80 align=right>12 in</TD><TD align=right>304.8 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Rim Width Range: recommended rim widths that this tire will fit on';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width="100%"><TBODY><TR><TD width=100>Rim Width Range:</TD><TD width=160 align=right>Unrecognized tire size.</TD></TR></TBODY></TABLE></TD><TD><TABLE width="100%"><TBODY><TR><TD width=100>Rim Width Range:</TD><TD width=160 align=right>Unrecognized tire size.</TD></TR></TBODY></TABLE></TD><TD><TABLE width="100%"><TBODY><TR><TD width=100>Rim Width Range:</TD><TD width=160 align=right>Unrecognized tire size.</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Diameter: overall height of the tire';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Overall Diameter:</TD><TD width=80 align=right>19.99 in</TD><TD align=right>507.74 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Overall Diameter:</TD><TD width=80 align=right>20.54 in</TD><TD align=right>521.71 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Overall Diameter:</TD><TD width=80 align=right>21.09 in</TD><TD align=right>535.68 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Sidewall: the height of one tire sidewall';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Sidewall Height:</TD><TD width=80 align=right>3.99 in</TD><TD align=right>101.34 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Sidewall Height:</TD><TD width=80 align=right>4.27 in</TD><TD align=right>108.45 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Sidewall Height:</TD><TD width=80 align=right>4.54 in</TD><TD align=right>115.31 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Radius: height from the center of the tire to the outside edge';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Radius:</TD><TD width=80 align=right>9.996 in</TD><TD align=right>253.89 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Radius:</TD><TD width=80 align=right>10.27 in</TD><TD align=right>260.85 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Radius:</TD><TD width=80 align=right>10.54 in</TD><TD align=right>267.71 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Circumference: distance around the outside edge of the tire';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=100>Circumference:</TD><TD width=80 align=right>62.80 in</TD><TD align=right>1595.1 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Circumference:</TD><TD width=80 align=right>64.52 in</TD><TD align=right>1638.8 mm</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Circumference:</TD><TD width=80 align=right>66.25 in</TD><TD align=right>1682.7 mm</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Revs per Mile: number of times this size tire rotates when travelling one mile';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE><TBODY><TR><TD width=100>Revs per Mile:</TD><TD width=130 align=right>1040.</TD></TR></TBODY></TABLE></TD><TD><TABLE><TBODY><TR><TD width=100>Revs per Mile:</TD><TD width=130 align=right>1012.</TD></TR></TBODY></TABLE></TD><TD><TABLE><TBODY><TR><TD width=100>Revs per Mile:</TD><TD width=130 align=right>986.2</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'; window.status='Speedometer: speedometer readings when travelling at 60mph / 100km/h';" onmouseout="style.backgroundColor='#FFFFFF'; window.status='';"><TD bgColor=#eeeeee><TABLE width=280><TBODY><TR><TD width=120>Actual Speed:</TD><TD width=80 align=right>60 mph</TD><TD align=right>100 km/h</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Speedometer1:</TD><TD width=80 align=right>58.3 mph</TD><TD align=right>97.3 km/h</TD></TR></TBODY></TABLE></TD><TD><TABLE width=280><TBODY><TR><TD width=100>Speedometer1:</TD><TD width=80 align=right>56.8 mph</TD><TD align=right>94.8 km/h</TD></TR></TBODY></TABLE></TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'" onmouseout="style.backgroundColor='#FFFFFF'"><TD bgColor=#eeeeee>Speedometer Difference: -</TD><TD>Speedometer Difference: 2.766% too slow</TD><TD>Speedometer Difference: -5.17% too fast</TD></TR><TR style="BACKGROUND-COLOR: #ffffff" onmouseover="style.backgroundColor='#D3D3D3'" onmouseout="style.backgroundColor='#FFFFFF'"><TD bgColor=#eeeeee>Diameter Difference: -</TD><TD>Diameter Difference: 2.68%</TD><TD>Diameter Difference: 5.22%</TD></TR></TBODY></TABLE></CENTER><TABLE width=620 background=images/spacer.gif><TBODY><TR><TD vAlign=top>Tire Calculator Notes:
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its too difficult, could anyone calculate for me, i am having stock sized tires and rims for corolla xli 2007, what if i am going for 15", and what could be the best tire size, to achieve better breaking and grip of road.
Dear pls check this site www.http://www.1010tires.com/TireSizeCalculator.asp?action=submit just fill in the blank and you will get the result.