As tire dealers all over the country work to adapt to the pressures of online tire sales, the looming question about Amazon.com Inc. in the market is price.

It’s been a year since Amazon.com Inc. added tire installation to the check-out process for tire-buying consumers. Since then, it’s partnered with three retailers to build a nationwide network of installation options: Monro Inc., Pep Boys — Manny, Moe & Jack, and Sears Auto Centers.