What is the recommended diameter?
If your car came stock with something similar to the 6th gen LX (195/65/15) then you're roughly 1.5" off, or 6% off on diameter.
The biggest impact is that your speedo will be off. Having a smaller diameter tire will tell you you're going faster than the true speed. It'll also rack up the miles on the car (according to the odometer) a little bit faster.
Other than that, as long as the tires are rated to carry the load of the Accord then there's no problem. Check the load capacity of the tires....
b
|