This is a handy website for tire size changes...
http://www.tiresizecalculator.info/
You put in your current tire size and a table appears with all comparable tires up and down in size and the % changes to your speedo, etc. Everything you'd need... here's an example of your results. Now that you see the results, cross-reference the sizes with the make/model of tire you want and see what you can put on the Ody and what will happen to the speedometer. More than a 3% difference is bad for any vehicle so stay within this range. Try the website, many more sizes than this sample comes up.
Hope this helps.
215 70/16, diameter diff: -0.63% , speedometer will read faster than actual.
335 45/16, diameter diff: -0.56% , speedometer will read faster than actual.
275 55/16, diameter diff: -0.42% , speedometer will read faster than actual.
305 50/16, diameter diff: -0.07% , speedometer will read faster than actual.
235 65/16, CURRENT SIZE
255 60/16, diameter diff: +0.07% , speedometer will read slower than actual.
205 75/16, diameter diff: +0.28% , speedometer will read slower than actual.
195 80/16, diameter diff: +0.91% , speedometer will read slower than actual.
285 55/16, diameter diff: +1.12% , speedometer will read slower than actual.
http://www.tiresizecalculator.info/
You put in your current tire size and a table appears with all comparable tires up and down in size and the % changes to your speedo, etc. Everything you'd need... here's an example of your results. Now that you see the results, cross-reference the sizes with the make/model of tire you want and see what you can put on the Ody and what will happen to the speedometer. More than a 3% difference is bad for any vehicle so stay within this range. Try the website, many more sizes than this sample comes up.
Hope this helps.
215 70/16, diameter diff: -0.63% , speedometer will read faster than actual.
335 45/16, diameter diff: -0.56% , speedometer will read faster than actual.
275 55/16, diameter diff: -0.42% , speedometer will read faster than actual.
305 50/16, diameter diff: -0.07% , speedometer will read faster than actual.
235 65/16, CURRENT SIZE
255 60/16, diameter diff: +0.07% , speedometer will read slower than actual.
205 75/16, diameter diff: +0.28% , speedometer will read slower than actual.
195 80/16, diameter diff: +0.91% , speedometer will read slower than actual.
285 55/16, diameter diff: +1.12% , speedometer will read slower than actual.