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The Honda Shadow Spirit, recommends 29 psi in the front tire and 32-36 psi in the rear tire.
The standard rear tire size for this bike is 140/90-15 70H. You may be able to find another 15 inch tire that fits, for example 150/90-15 but the bike will not ride as smoothly on that.
The standard or stock tire for this bike is 140/90-15. A tire that is 165/80/15 is probably the largest you can fit on this bike. If you install a tire that has a wider thread your cornering and turning may suffer and the bike may become dangerously unstable.
235/75/22 is the factory size for 2009 Honda Civic
28 psi for the front and 36 for the rear tire.
2.0 bar front and back.
32 front, 36 rear.
Front tire = 120/90-17 Rear tire = 160/80-15
185/65/R14
p205/55R16
185/65R - 14
29 psi front tire, 38 psi rear tire.