To simulate wear without the wait ... especially if you begin to experience reduced grip. Check tires for other flaws. Replace any tire with cracks, cuts, or bulges in the sidewall.

Too low a saddle can also reduce traction and grip while climbing, causing you to compensate by pedaling inefficiently and bobbing up and down, which will weight and unweight the rear of the bike, ...

On our hill, Tyre Grip improved starting traction slightly, but the Accord couldn't reach the top with or without the spray. With AutoSocks over the front tires, however, the car summitted many times.