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Fitting Your Bike Are you confused about how you should fit a bike to your particular body dimensions? Have you been reading, found the terms Merxx or French Fit, and don’t know what you need? Every style of riding is different- in how you fit the bike to you, and the sizing of the bike itself. It’s more than just measuring your height, reach and inseam. With the help of Bike Fitting, you’ll be able to find the right fit for your frame size, style of riding, and your particular dimensions. Here ya’ go…..the location for everything fit related.

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Old 05-14-14, 04:03 AM   #1
rubez
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Can't select outer and inner most gears

I am trying to set up my rear gears.

I have tightened the cable into the derailleur - but I can't select the biggest cog or the smallest cog on the rear cassette... I can select everything inbetween.

I think my chain may be the wrong length, as I changed from a 6-speed to a 7-speed cassette, and also changed my derailleur from a Tourney to an Alivio.

Does the chain length have any bearing on this?

Or does it sound like another problem?

Thanks.
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Old 05-14-14, 08:05 AM   #2
Doc V
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Could be the high and low limit screws are set such that they do not allow the rear derailleur to shift to those gears. It could also be that they chain is too short, but I would expect that it could shift to the smallest cog in rear cassette when on the small chainring since in the position there is still slack in the chain.

To check your chain length, follow the guide at Sheldon Brown's website Derailer Adjustment.

Last edited by Doc V; 05-14-14 at 08:11 AM.
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Old 05-14-14, 06:54 PM   #3
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What are you shifting with? Downtube? Bar end? Brifter? I suspect a mismatch between shifter/derailleur/cassette. Maybe the limit screws, but that seems unlikely. It's not the chain, though follow the advice to get correct chain length. Too short a chain will sooner or later put the derailleur into your spokes.
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