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Old 01-26-05, 11:34 PM   #1
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So what did I just buy here?

I'm a vintage road bike guy -- don't know from nuttin' about MTBs, but I picked up an older, dark blue, almost black Diamondback Sorrento today for $20. It's a 21-speed with Shimano Acera X derailleurs and crankset, Shimano Altura shifters and brakes, Cheng Shin SemiSlicks. According to labels on the frame, it's designed in the US and built in China.

It's been used but not apparently abused. The wheels are straight, and it goes down the road like it ought to. The main puzzler is the shifters (this is where the indexing is, right?); neither of them do anything. pressing either lever has no effect on the derailleurs, although they're both in apparent good working order.

I'd like to try to find out about what year this thing is, and what gives with the shifters, like whether these shifters belong with these derailleurs. If they do, I need to find some info on servicing and troubleshooting them. Like I said, I'm a friction-shifter person and this is the first bike I've had with indexing, so I'm a complete noob about maintaining them. Any info or suggestions will be much appreciated. Here's pics of the bike and components:

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Old 01-27-05, 12:14 AM   #2
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Huh? Sorry I can't be of anyhelp.
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Old 01-27-05, 12:21 AM   #3
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check and make sure the cables are attached properly
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Old 01-27-05, 03:34 AM   #4
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Turn it into a SS.
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Old 01-27-05, 10:07 AM   #5
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Welcome to the dark side.

Perhaps the previous owner abused and/or broke the mechanism in the shifter pods. I would shoot some lube in there and let it sit for a while, detach the cables from the derailleurs, and try and cycle the shifters. If that doesn't help, tear apart the pods and see if anything obvious is wrong. If you can't figure it out, replace them...they're bottom of the line and crappy anyway, but for a twenty dollar bike, that should come as no surprise.

Sorry I can't offer any input on the year of the frame.
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Old 01-27-05, 10:38 AM   #6
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When you press a shifter all the way to the end it will only shift one gear. It will not go the whole way across the freewheel. Before you start working on anything, have the back wheel in the air, in a stand, or held by a friend. Keep the pedals turning gently and hold the shifter all the way to one end or the other and keep pedaling for a bit. Wait a few pedal revolutions to see if it shifts.

Before you do this pedal with the wheel up for a while to get the chain to line up with where the derailleur is now.

By looking at the cables and the chain in the picture it does not look like the cables are badly rusted. This would be the most likely cause of a problem, if it still does not shift.
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