The tire seems to be definitely wearing on the outside of the tire. I cannot tell about the inside as much. They are all brand new tires?

Do yo mean if the idler arm boot is cracked?

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1984 300D Turbo
1980 300SD Sold
1983 300TD Sold
Dagger 16 ft. Legend Canoe (for the weekends)
Marin Northside Trail Mtn. Bike