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Circular high and low derailleur issue?

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Circular high and low derailleur issue?

Old 06-20-23, 12:50 PM
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Circular high and low derailleur issue?

Hello,

I am unable to adjust my high and low derailleur since the screw heads are circular. Regular screwdrivers I have don't work since the high and low screw heads are circular.

Does anyone know what specific screw head or tool I need to turn them?

I am working on a Shimano bike.

Thanks.
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Old 06-20-23, 01:22 PM
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I would first get involved with the forums post in the various active threads and get your post count up to 10 then I would post pictures so we can see what happened.

Shimano doesn't make bikes, they do make parts and have been making parts for a long long long long long long time and without pictures who knows what you are trying to turn and on what? That is why the pictures are going to be crucial. Shimano uses JIS screws on their derailleurs so a modern CrossTip screwdriver or a JIS screwdriver will work just fine unless something very odd.

I have a feeling that you are trying to tighten or loosen a rivet? Get us those pictures and we can see what is going on.
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Old 06-20-23, 05:48 PM
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Yeah, not really sure what you’re describing. Sounds almost like Torx or a rounded out Allen bolt. Are there similar photos on the internet you can link to?
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Old 06-20-23, 10:17 PM
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The type of screw will depend on the make and model derailleur. For example, the Mavic derailleur on my Limongi needs Allen hex wrenches to adjust the limit screws
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Old 06-20-23, 10:33 PM
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Originally Posted by foruseforwork
Hello,

I am unable to adjust my high and low derailleur since the screw heads are circular. Regular screwdrivers I have don't work since the high and low screw heads are circular.

Does anyone know what specific screw head or tool I need to turn them?

I am working on a Shimano bike.

Thanks.
Up on the top left do you see the Bike Forums logo? Under it do you see the link "Gallery" post your pictures there.
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