What's the reference/name/size for the bolt that screws the crankset?

[crazytraveler]

I am cycling in the mountains of West Sichuan and yesterday some squeaking noises started to drive me crazy every time I pedalled hard with my right foot. I was proceeding to tighten everything up just in case... and I manage to damage the bolt that screw the crankset into the bottom bracket.

My gf is in a major city in China, and she will join me in a couple of weeks, so I wanted to give her the reference of the bolt to get me a new one.

I attach an image of the not damaged bolt I am talking about.

[Danneaux]

CT,

The part you are referring to is commonly called a "crank arm fixing bolt"...or simply, "crank bolt".

You need one in M8 to fit your internal bottom bracket.

Here:
https://www.sjscycles.co.uk/chainsets/stainless-steel-8-mm-crank-bolts-shimano-type-allen-key-style-with-plastic-dust-shield-per-pair/?geoc=US

They are also sometimes less commonly called "bottom bracket spindle bolts" or "bottom bracket axle bolts".

Sure sorry to hear of your troubles and hope a replacement will soon set you right.

Best,

Dan.

[crazytraveler]

Thanks!