My rear brakes on my NC30 are standard. I just need to know what size the allen key is used on the heads of the Rear brake disc bolts? Wanting to fit some magnets inside the allen key heads for a speed sensor. Thankyou

A6 theyre m8 bolts

So they 8mm allen key heads then mate? Would 8mm circular magnets fit in them or would i be better with 7mm or maybe even 6mm? Thanks.

porndoguk wrote:A6 theyre m8 bolts

I reckon a 7mm will probably be a tight fit, think id still glue it in tho. Can i ask why your bothering? whats wrong with the stock speedo pick up?

Drunkn Munky wrote:I reckon a 7mm will probably be a tight fit, think id still glue it in tho. Can i ask why your bothering? whats wrong with the stock speedo pick up?

Its for my gear indicator, it requires an electrical speedo signal lol. Cool so 7mm should be ok glued in mate?

ahh i see, well id try a 7mm, 8mm wont fit as the bolt head is hex but ive never fitted one so your just have to try it

The thread is 8mm dia, so the head will be at least 10mm dia ish,

The size of the allen Key as per your original post is an A6 key, which will be a 6mm hex.

Im not sure how the magnets are shaped when supplied but hope this extra advice helps.

porndoguk wrote:The thread is 8mm dia, so the head will be at least 10mm dia ish,

The size of the allen Key as per your original post is an A6 key, which will be a 6mm hex.

Im not sure how the magnets are shaped when supplied but hope this extra advice helps.

Ah right thankyou, so ill probably try a 5mm circular magnet to go in the 6mm allen key head. I dont think a 6mm magnet would go in lol, im getting a low profile hall effect sensor to mount on the rear brake caliper nounting plate to read the magnet. Do yous think glueing a 5mm magnet will go into the 6mm hex hole

g1b50n wrote:

porndoguk wrote:The thread is 8mm dia, so the head will be at least 10mm dia ish,

The size of the allen Key as per your original post is an A6 key, which will be a 6mm hex.

Im not sure how the magnets are shaped when supplied but hope this extra advice helps.

Ah right thankyou, so ill probably try a 5mm circular magnet to go in the 6mm allen key head. I dont think a 6mm magnet would go in lol, im getting a low profile hall effect sensor to mount on the rear brake caliper nounting plate to read the magnet. Do yous think glueing a 5mm magnet will go into the 6mm hex hole

You could always change a bolt for something more suitable to glue on.

What happens when you need a new brake disc? It can be shocked out can it? Surely someone makes a magnetic tipped bolt?