I received a new Specialized '07 Expedition for Christmas. I have only ridden it twice. Yesterday my husband noticed one of the chain rings looked chewed up and not uniform all the way around. He took it to the bike shop and they said that is the way its suppose to be...helps with shifting. Can this be true? Help!
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
The LBS is correct. As MichaelW noted, the various shapes and heights of selected chainring teeth plus the pins and other "gadgets" around the rings greatly improve shifting, particularly under load. These enhancements make index front shifting practical.