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31-03.-2008, 08:34 AM
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#1 |
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Guest
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Derailler problem
For some time now I've had a problem with the derailler on my road bike
(Tiagra). Around the middle gears it has a habit of jumping between gears. I've replaced cassette and chain but discovered mid-race yesterday that it is still happening. On the bike stand it seems to be adjusted fine with no jumping, but under pressure, ie. standing on the pedals going uphill, is when it happens again. Anyone have any ideas? DaveB |
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31-03.-2008, 08:44 AM
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#2 |
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Guest
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Re: Derailler problem
DaveB wrote:
> For some time now I've had a problem with the derailler on my road > bike (Tiagra). Around the middle gears it has a habit of jumping > between gears. I've replaced cassette and chain but discovered > mid-race yesterday that it is still happening. On the bike stand it > seems to be adjusted fine with no jumping, but under pressure, ie. > standing on the pedals going uphill, is when it happens again. Anyone > have any ideas? My first port of call would be to replace the shift cable, but only after I'd had a long hard look at the cable guide under the bottom bracket (assuming your bike routes the cable this way) and replaced it as well if it shows any wear. A high quality Teflon coated cable helps. Given that you have done all the other things, if it is not the cable or the guide binding then start looking for less likely things like cracked/broken frame tubes. -- |
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31-03.-2008, 09:37 AM
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#3 |
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Guest
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Re: Derailler problem
DaveB wrote:
> For some time now I've had a problem with the derailler on my > road bike (Tiagra). Around the middle gears it has a habit of > jumping between gears. I've replaced cassette and chain but > discovered mid-race > yesterday that it is still happening. On the bike stand it > seems to be adjusted fine with no jumping, but under pressure, > ie. standing on the pedals going uphill, is when it happens > again. Anyone have any ideas? Maybe this: http://sheldonbrown.com/autoshift.html John |
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