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23-02.-2008, 03:37 PM
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#1 |
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Registered User
Join Date: Jan 2008
Posts: 20
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My Back Gears Switch By Themselves to Higher One
My back gears switch by themselves from first to second and second to third. The gear switch lever moves up by itself.
How can I troubleshoot and/or correct this problem? |
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23-02.-2008, 11:34 PM
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#2 | |
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Registered User
Join Date: Dec 2007
Posts: 859
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Re: My Back Gears Switch By Themselves to Higher One
Quote:
What type shifter(friction, index/click shifting?), where is it, on the downtube, barend, integrated brake lever/shifter? Or take a trip to a competent bike shop and ask them. |
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24-02.-2008, 01:46 AM
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#3 | |
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Registered User
Join Date: Jul 2005
Posts: 2,026
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Re: My Back Gears Switch By Themselves to Higher One
Quote:
Is your bike, by chance, a MTB with a rear suspension? Has this always happened? Have your recently done some "maintenance" on the bike and the problem subseqently manifested itself? How old is your bike and/or the shifters? |
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24-02.-2008, 04:31 AM
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#4 |
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Registered User
Join Date: Jan 2008
Posts: 20
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Re: My Back Gears Switch By Themselves to Higher One
Hi.
Bike: is a Peugeot 10 speed racer. Age: Unknown. My rough guess based on scratches/paint/dirt before I cleaned it: 10 years. Shifter: Friction Shifter Mount: Handlebar stem Problem started: Since I started riding it. Seller moved and I have no way of finding out about the bikes history. Maintenance Done (before 1st ride  Cleaned off sprocket, crank, chain, and rear shifter mechanism with WD40 and other grease removing spray products. Cleaned rear axle bearings.Last edited by TomBrooklyn : 24-02.-2008 at 04:37 AM. |
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24-02.-2008, 04:39 AM
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#5 |
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Registered User
Join Date: Jun 2006
Posts: 1,196
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Re: My Back Gears Switch By Themselves to Higher One
Start by tightening the screw on the friction shifter. Then make sure the freewheel isn't worn out.
I've got an old low end peugeot too. They're pretty nice but the paint and chrome aren't so durable. I am sure you know that the way you tighten rear axle bearings is absolutely critical for longevity and safety.
__________________
Your mouthwash ain't makin' it. |
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24-02.-2008, 04:46 AM
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#6 | |
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Registered User
Join Date: Jul 2005
Posts: 2,026
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Re: My Back Gears Switch By Themselves to Higher One
Quote:
If the "washer" (which provides the friction) is worn, you can make a new one from a plastic MILK cap -- punch a hole in the middle, trim to fit, install. |
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24-02.-2008, 08:27 AM
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#7 |
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Registered User
Join Date: Jul 2006
Posts: 453
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Re: My Back Gears Switch By Themselves to Higher One
Nice fix alfeng......pitty ergo shifters aren't that cheap to repare!
__________________
******BLATANT ADVERTISING ALERT****** I have ceramic bearings for: Campy/Fulcrum high end hubs/wheels Shimano hubs and pedals check out my ebay items here |
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24-02.-2008, 10:45 AM
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#8 |
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Registered User
Join Date: May 2004
Posts: 15
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Re: My Back Gears Switch By Themselves to Higher One
Check your chain for wear - this started happening to me once and a few days later the chain broke. A bad link can cause the chain to stretch under tension and skip to a different gear.
__________________
Jonathan Sachs |
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