Michelin Scorcher 21 Front Tire (120/70R-17) Cruiser / Custom. A unique combination of the traditional Cruiser look, agility and wet grip for Harley-Davidson&#174; Street Rod&trade; model. Traditional Cruiser Design for Confident Urban Riding. Conceived exclusively for the Harley-Davidson&#174; Street Rod&trade;, MICHELIN&#174; Scorcher&#174; 21 tires features the exclusive Harley-Davidson&#174; co-branded stylings of MICHELIN&#174; Scorcher&#174; 31 tires and offers excellent durability and we Amplified Density Technology for Urban Agility.