Thinking about getting a set of 214s for summer use and keeping my stock 18s for winter duty.
Looks like overall diameter will be off slightly 28.66/.68 for the 20s and 29.04 for the 18s.
My CTS-V summer winter combo is actually different by .65 and I know the summer speedo is about 3-4 mph fast and just correct for it.
Does anyone have their speedo programmed when they swap out the winter/summer tires or they just manually compensate? I guess I'm curious if the programming is different from the factory too, it may be small enough that its figured into the margin of error???
Jay
Looks like overall diameter will be off slightly 28.66/.68 for the 20s and 29.04 for the 18s.
My CTS-V summer winter combo is actually different by .65 and I know the summer speedo is about 3-4 mph fast and just correct for it.
Does anyone have their speedo programmed when they swap out the winter/summer tires or they just manually compensate? I guess I'm curious if the programming is different from the factory too, it may be small enough that its figured into the margin of error???
Jay