Picked up a spare tire for my dad's 2014 Cadillac ELR off of a Cadillac DTS. The diameter of the spare from the DTS (125/70/17 and 23.9") is significantly smaller than the diameter of the tire/wheel combo on the ELR (245/40/20 and 27.7")
I can find new spare tires that will mount just fine to the spare wheel that more closely match the diameter of the normal tire/wheel setup from Tirerack. What I'm wondering is how close I should get the diameter to match?? There's two sizes that are within 1% of the standard diameter but the size that is closest is currently back ordered through Tirerack so I may have to go with the other size. Since it's within 1%, don't know if it'll matter anyway.
I can find new spare tires that will mount just fine to the spare wheel that more closely match the diameter of the normal tire/wheel setup from Tirerack. What I'm wondering is how close I should get the diameter to match?? There's two sizes that are within 1% of the standard diameter but the size that is closest is currently back ordered through Tirerack so I may have to go with the other size. Since it's within 1%, don't know if it'll matter anyway.