Personally I'd go for the tyre that performs best on bitumen - longevity and low noise, the 10% of the time that you can drive off road you will just have to take extra care. Africa maybe different in parts - I dont have any experience there. Bear in mind that the vehicle manufacturers will have spent a good deal of time testing their vehicle with the standard tyre sets - have a look at the tyre placard and see what range of tyre sizes they have approved. I know that tyres are always a compromise as there are so many different conditions that you can meet espcially in the overland trip you are proposing. Look for the tallest approved tyre you can get to fit the rim as this may give you upto 5cm more ground clearance which will come in handy at times.
The other thing you can do is have a look on the 'net and see what tyre sizes Toyota offer on their vehicles in the countries you will pass through - I doubt there will be a great variance as Toyota really do build World vehicles nowadays.
|