From 17s to 18s
11-23-2010, 09:08 AM
#11
3rd Gear Member
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Join Date: Dec 2009
Location: Acworth,Ga.
Posts: 812
It depends on what size tires are used. A 245/45-17 is the same outside diameter as a 245/40-18.
Similarly a 275/40-17 (same OD as the 245/45-17) is also the same OD as a 275/35-18.
As long as the OD remains the same (or within 0.2" of "the same") there will be no need to recalibrate the speedometer or anything else.
One other issue re: front and rear tire sizes. A difference in OD of 1.0" may trigger the ABS/traction control, 1.5"+ will...
Similarly a 275/40-17 (same OD as the 245/45-17) is also the same OD as a 275/35-18.
As long as the OD remains the same (or within 0.2" of "the same") there will be no need to recalibrate the speedometer or anything else.
One other issue re: front and rear tire sizes. A difference in OD of 1.0" may trigger the ABS/traction control, 1.5"+ will...
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