RennTech Oversized Tire Module (35" Tires) for Sprinter

One of the best upgrades for any offroad vehicle is oversized offroad tires. They offer more traction and more ground clearance. The only issue is that until now, the Sprinter only allowed you to install a max tire size of 33" (275/70/17). Now, thanks for the tire ROM from Owl and Renntech, you can install up to a 35" tire without issue.  Why is the Renntech software needed? The Mercedes onboard computer (ECU) checks both the wheel speed and the GPS speed at which the van is traveling.   By installing a tire larger than a 275, your wheels will turn slower for a given speed (lower wheel RPM), which will, therefore, cause the computer to think there is a problem.  The ECU will then disable Adaptive Cruise Control and Emergency Brake Assist.  The good news is that Renntech and Owl finally have a fix. Plugging in the Renntech Tire ROM to the OBD2 port on your van will change the acceptable tire size inside the van's ECU, allowing all systems to function as intended. You can then remove the