Bike Shop or Bike Help

[WoodyCT]

Probably have the gear combo off. if the chain is on the small front ring it will seem too loose when on the smaller rear cogs.

Put the chain on the middle ring in the front and you can use all the rear cogs.

Small front ring is for the 3 largest rear cogs only. Big front ring is for the 3-4 smallest rear cogs.
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[cableguy]

Spence it might be the derailleu....I have it on the middle gear, but when I try to change gears, the chain comes off....not sure....looks like I am walking tomorrow morning, have to mess with it more when I get home....thanks....if I cant figure it out, I'll have someone look at it