Having problems with your GMC Blazer ?

Can I replace my 255/70/16 tires with 245/75/16 tires

Posted / edited by AnonymousUser on : 16-09-2019

Answers :

NOT, I do not recommend you to do it. The difference is too important between 255/70/16 and 245/75/16 tires!
\015\012
\015\012The Wheel Diameter "Dw" calculation is: Dw = Dr + 2 x Ht
\015\012Dw - Wheel Diameter
\015\012Dr - Rim Diameter
\015\012Ht - tire height
\015\012
\015\0121. For 255/70/16 tire:
\015\012Dr = 16" x 25.4 = 406.40 mm
\015\012Ht = 70% x 255 mm = 0.70 x 255 mm = 178.50 mm
\015\012
\015\012Dw(1) = Dr + 2 x Ht . Dw(1) = 406.40 mm + 2 x 178.50 mm = 763.40 mm.
\015\012Dw(1) = 763.40 mm.
\015\012
\015\0122. For 245/75/16 tire:
\015\012Dr = 16" x 25.4 = 406.40 mm
\015\012Ht = 75% x 245 mm = 0.75 x 245 mm = 183.75 mm
\015\012
\015\012Dw(2) = Dr + 2 x Ht . Dw(2) = 406.40 mm + 2 x 183.75 mm = 773.90 mm.
\015\012Dw(2) = 773.90 mm.
\015\012
\015\012So, the difference between two tire types is:
\015\012Dw(2) - Dw(1) = 773.90 mm - 763.40 mm = 10.50 mm.
\015\012
\015\012The second tire 245/75/16 does have a bigger wheel diameter, with a plus of 10.50 mm in comparison with the first tire 255/70/16.
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