What tool do I need?

[mat777]

Hi everyone,

I notice the chainrings on my bike are held to each other by these:



my question is, what the hell kind of tool do I need to get purchase on the slotted rear parts? I've googled but cant seem to get the right tool name, and short of filing a very wide slot in a flathead screwdriver I dont know what else to do?

[Xenocide]

I use a wide flat headed screwdriver..

[mat777]

Xenocide said:

I use a wide flat headed screwdriver..

You cant though because the end of the inner part stands proud of the slotted bit, hence me sayind I'd need a wide flathead with most of the middle machined out

[AndrewEH1]

Should be a T30 (Torx)

I use this http://www.chainreactioncycles.com/Models.aspx?Mod... works for chainrings and rotor bolts.

Edit: Slightly misread your post, I've never had to really hold the bolts from the other side the Torx side usually locks itself in on it's own, it that makes sense (probably doesn't...)

Edited by AndrewEH1 on Sunday 2nd December 00:19

[mchammer89]

http://www.chainreactioncycles.com/Models.aspx?Mod...

[GaryGlitter]

mchammer89 said:

http://www.chainreactioncycles.com/Models.aspx?Mod...

Correct - I got a Shimano one about 20 years ago, was/is described as having one end for the reverse side of chainring bolts and the other end for crank dust cap covers.

[donfisher]

mat777 said:

What tool do I need?

Just an allen key IME, no need for the chainring nut wrench. For removal they’re normally a little bit bonded to the chanring and when they’ve undone you can just hold the slotted side.

For installing them back in, by the time they’ve got down to the sort of level where you can’t get the screwdriver to work they’ll just kind of work by themselves.

I presume you’ve tried this hence the question but if you haven’t, give it a go.

Edited by donfisher on Monday 3rd December 10:19

[mat777]

Thanks guys,

I have ordered one of those tools from chainreaction. I have tired a screwdriver as you suggested Donfisher, but can't get them done up tight enough