The first number determines the width of the rim in inches, while the second which expresses the diameter of the rim (16 or 17 inches here)
For the front there are 3 possibilities (3.5x17 - 3.5x16.5 - 3.5x16). We always keep the same width 3.5 inches but several diameters are available (17 inches or 16.5 inches or 16 inches)
The first is the most common because only the 3.5x17 allows the fitting of tires ideally approved in 120/70/17 such as Continental Attack SM, Michelin Power 5 or even Slick Metzeler Racetec SM (only Supermoto slick available in 17 inches )
But for the track, several options are available to us in order to reduce the dribble during the attack on the circuit (3.5x16 or 3.5x16.5) We find a more lively motorcycle and more inclined on the front which allows a more offensive position on the bike. Here we find ranges of slicks from Michelin (Power Supermoto in range A or B or C) or even Metzeler (with its Racetec SM).
For the rear, we have 4 possibilities (all in diameter 17 here). From widest to narrowest: 4.25x17 - 4.5x17 - 5x17 and 5.5x17
The 4.25x17 and the 4.5x17 must be fitted with 150/60/17 tires and the 160 wide is not recommended because the tire will be too domed. It is the ideal mount for small displacements (in order to keep a motorbike lively, I am thinking in particular of 125cc, or for old Yamahas or Kawasakis with a narrow swingarm.
The 5x17 is the most widespread, it goes on the majority of motorcycles and allows the fitting of road and slick tires in 160/60/17. It passes easily on KTM, Husqvarna, Yamaha (recent), GasGas ect.
The 5.5x17 is recommended only for Supermotard swingarms or widened otherwise be careful not to rub.
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