Is there a dedicated tool to hold this slotted `nut` from spinning while unscrewing- for removing chain rings? See photo.

[night cycler]

Initial thoughts are use a screw driver. The thing is when these are tightened up, a screw driver could not really be used because the `male` part is flush up to the line where a screw driver would be placed. So, in reality there is only a small slot either side to hold the `nut` from rotating while undoing. They have never been off, and someone has probably over tightened these when this bike was originally put together. I have managed to "crack" them but both parts are rotating when using the Allen key.

I am relying on you good people for advice.
Thank you

 

[Ajax Bay]

Yes, but here's a bodge:
https://www.cyclechat.net/threads/chainring-bolt-nut-seized-any-ideas.183117/
I've found you can normally engage one slot (ie on one side of the bolt) with a bladed screwdriver and get the bolt pretty tight that way, finishing off with the nut held by friction. Am searching for the CycleChat thread which has an image of the 'special tool'.

 

[netman]

You want one of these... https://www.wiggle.co.uk/park-tool-chainring-nut-wrench-cnw2/

 

[Yellow Saddle]

You want one of these... https://www.wiggle.co.uk/park-tool-chainring-nut-wrench-cnw2/

Naah, that's a toy. Get the Shimano one.

 

[neil_merseyside]

A thin coin will generally let you tighten it to the point that friction will allow you to tighten further.

 

[Jenkins]

Once you've removed them, replace them with ones that take an allen key on both sides such as...

https://www.superstarcomponents.com/en/m8-standard-chainring-bolts-uk-made.htm

 

[silva]

Shoes have a metal plate, about 10 cm long, between inner sole and basis hardboard, that holds the height difference front/back
The thickness is so that it snugs nicely in the slotted nut of the chainring bolts, it has sharp not rounded edges and it's a strong plate. Price is zero if you find old shoes for zero.

 

[silva]

Once you've removed them, replace them with ones that take an allen key on both sides such as...

https://www.superstarcomponents.com/en/m8-standard-chainring-bolts-uk-made.htm

Is aluminium/thread a good idea for chainring bolts?

 

[Jenkins]

Is aluminium/thread a good idea for chainring bolts?

No idea - I'll leave that to the experts. I just used those an an example.

 

[PpPete]

I find this style of tool a lot easier to use

 

[Yellow Saddle]

I find this style of tool a lot easier to use
View attachment 511902

That's proper. None of this ParkTools shoot.

 

[Jenkins]

I find this style of tool a lot easier to use
View attachment 511902

Nice - do you have a part number or link to where this is available as I've still got the slotted nut on some of my bikes.

EDIT: Don't worry - just found out it's TB-TH20
Amazon product ASIN B00TPZEB8SView: https://www.amazon.co.uk/Super-T-wrench-chainring-wrench-Torx/dp/B00TPZEB8S

 

[freiston]

I have a tool for that on my multitool:
https://www.e-bikeshop.co.uk/Park-Tool-MTB-7-Multi-Tool

 

[PpPete]

I think mine is actually one of these from Rose: https://www.rosebikes.co.uk/xtreme-...?product_shape=standard&article_size=Standard
I bought a load of different tools from them a while ago when they were having a sale - made it worth the shipping cost.

 

[silva]

No idea - I'll leave that to the experts. I just used those an an example.

Since a couple weeks I tried to source steel versions of those double allen key bolts (they would make it alot easier/quicker for me to flip/rotate chainrings on their mount) but wherever I found such, all aluminium.