The diameter of your 205/75B14 tire is 26.1", and has a width of 8.1".
If you are needing a replacement tire I recommend the # AM1ST86 if you only want to replace one tire, or the # AM10235 if you are ok with replacing both tires.
The reason for this is the # AM1ST86 is a bias ply tire like your current tire, which you can tell by the B in the size between 75 and 14, where the # AM10235 is a radial tire. Radial and bias ply tires have a different sidewall construction making them not... view full answer...
The rails that come with the Lippert Replacement Dual Rack Standard Repair Kit for RV In-Wall Slide-Out
Item # LC84FR are both 42-3/4" long. view full answer...