My high shifter isn't shifting in gears 1-4 (5-8 are fine). I took it to a shop and they said I need a new shifter because it's in "really bad shape". No details or anything. Does it seem like they're pulling a fast one on me?
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What type of shifter is it? As there are several kinds (Friction, stem, twist, rapid fire...) and whether if a "Really bad shape" is the most likely cause will vary. With down tube frictions shifters for example, they need almost no maintenance (Besides tightening the screw now and then) but with twister shifters it is common for the internals to wear out and not being able to stay on place. As mentioned in another answer if you don't trust this bicycle store, take your bike to another one for a second opinion and get things clarified.