Bar end mirror bolt size?

[Jøys]

Does anyone know what size/dimensions the 5 small bolts are on the handlebar end mirrors? I forgot to tighten mine and some of them fell out while riding. Thank you in advance

 

[Tom]

I don't know if it's exactly the same with the 401 mirrors, but from the mounting instruction of the 801 bar end mirrors it could be a M4x18.

 

[OblivionLord]

If you ask me just cut an 1" of the edges of the handlebar this way you have the full range of options out in the market including the clamp style which is far superior to the bolt in style.

 

[CRK]

Why would clamp style be superior?

 

[OblivionLord]

Why would clamp style be superior?

The clamp down method can apply far more force around the bar compared to pressing against it from the inside by using an anchor. It's like comparing a piston brakes to a drum brake. Piston brakes press against the disc from the outside whereas drum brakes press against from within.

What this means with bar-end mirrors is that your mirror is far less susceptible from moving out of place if it should accidently get hit when affixed using the clamp down method around the bar compared to the method of using an anchor from within the bar.