[Diesel_Dave]

I've been thinking over this potential mod for a while and wanted to get other's opinions. Would there be an advantage to running taller rear tires on a rear wheel drive vehicle (such as my pickup)?

The advantage of a taller tire is supposed to be lower engine RPM's becuase the powertrain has effectively been re-geared lower. Typically, however, people who go to taller tires (all around) see FE decrease. The thinking hear is that the taller tires hurt the aero because the effective frontal area has increased. Some people also cite the higher rotational mass. Another factor is that many taller tires, tend to generally have higher rolling resistances.

So here's my thinking. If you went to taller tires, but only on the rear of a RWD pickup, you'd get the gearing benefit without the aero penealty, right?

Anybody tried it?