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[togo]

...
Pard: The axle nut is also made from Grade 5 titanium. Bought it a Pro-Bolt as well for about 50 €.  It’s a M25 x 1.5 in case you want to get one.

I also am running a standard m25x1.5 instead of the stock, so much easier for a standard wrench or socket, including the lightweight aluminum ones e.g. Cycle Gear Stockton brand.

[Specter]

you are correct. an out of tolerance tone ring, or a bad sensor or anything in that circuit that is not right will cause grief with anything that needs some sort of speed reference,  TC, ABS, and of course regen which has to work with these two systems.  The bike will still run, just w/o abs,tc which if you were expecting them, could surprise you.  your speedo will work, that gets its reference from motor rpm, just as an fyi.

aaron.

[Pard]

...
Pard: The axle nut is also made from Grade 5 titanium. Bought it a Pro-Bolt as well for about 50 €.  It’s a M25 x 1.5 in case you want to get one.

I also am running a standard m25x1.5 instead of the stock, so much easier for a standard wrench or socket, including the lightweight aluminum ones e.g. Cycle Gear Stockton brand.

Would high quality aluminum work?

Material: T6 Aluminum

Replaces OEM KTM Part Number: 61010086000

Collar Nut Size: M25x1.5 WS=32 05

From the web:

"maximum torque before failure for this T6 aluminum nut, assuming 6061-T6 material and standard thread engagement, is around 470 Nm based on thread stripping strength. It will definitely handle 90 Nm without issue."

[Specter]

I wouldn't trust aluminum, it's soft, even the aircraft stuff, it creeps over time.  There's corrosion, even though aluminum does develop a protective layer pretty fast on exposure to air, the salts and crap will eat it up, just goto any dock and look at aluminum anything when it hits salt water, you being ny is it?, salt on the roads in winter will do it just as good.  Possibly galvanic activity with other metal too.

yes yes i know the swingarm etc is aluminum, but that nut is a small part with a huge force on it.  Unless you drill it and wire it, i can see it stripping, shaving, causing grief for you unfortunately.

just my opinion.
aaron

[Pard]

I wouldn't trust aluminum, it's soft, even the aircraft stuff, it creeps over time.  There's corrosion, even though aluminum does develop a protective layer pretty fast on exposure to air, the salts and crap will eat it up, just goto any dock and look at aluminum anything when it hits salt water, you being ny is it?, salt on the roads in winter will do it just as good.  Possibly galvanic activity with other metal too.

yes yes i know the swingarm etc is aluminum, but that nut is a small part with a huge force on it.  Unless you drill it and wire it, i can see it stripping, shaving, causing grief for you unfortunately.

just my opinion.
aaron

What material is the rear axle made out of?

[Specter]

i honestly don't know when i get home ill xrf mine and see.
it is rusting on my bike so ill say it's some sort of steel.

aaron

[Pard]

i honestly don't know when i get home ill xrf mine and see.
it is rusting on my bike so ill say it's some sort of steel.

aaron

Supposin its chromoly steel. 

[smithy]

i honestly don't know when i get home ill xrf mine and see.
it is rusting on my bike so ill say it's some sort of steel.

aaron

Supposin its chromoly steel.

Agree...possibly 4130 or 4140...or similar...??

Smithy.

[Pard]

...
Pard: The axle nut is also made from Grade 5 titanium. Bought it a Pro-Bolt as well for about 50 €.  It’s a M25 x 1.5 in case you want to get one.

I also am running a standard m25x1.5 instead of the stock, so much easier for a standard wrench or socket, including the lightweight aluminum ones e.g. Cycle Gear Stockton brand.

@jotjotde  , is this the one you are using?  Taller height is a real benefit.  18mm.

  The stock nut does not offer much material for the socket to grab on to.

https://www.probolt-usa.com/titanium-flanged-axle-nut-m25x-1-50mm-drilled-rear-wheel-tinut25150003dz2/

[Pard]

Speaking of metal fatigue, I was torquing down the real axle nut on my Grom to 59 Nm, and I heard a crack and felt something fail.

Removed the nut thinking I broke the axle which is a solid 12mm steel rod, but it turned out the nut failed and all the threads were pulled clean off. 

It was an old nut with dozens of cycles of on/off.  Cautionary tale there.

Replacing the axle and nut with a titanium set.


https://www.dhmotoring.com/collections/2014-2020-honda-grom-monkey/products/dhmtiaxles?variant=31697725096039

[Specter]

baah piffle !!   you have some custom fit pre formed helicoil there.  snake that bugger back in she'll be just fine!   

Aaron

[chisquare]

Finally I installed the EBC disk MD618.
Not because the OEM Brembo was worn out, it had still 4.7 mm after 87,000 km.
I had the EBC disc laying around for a long time and just wanted to see if it really fits.

It does! And it works well with the red Brembo pads.
On first sight the EBC does not look that much different.
Just in case someone is wondering, I also replaced the unsightly disc screws against some blingy titanium 😅

Please note that you will need some washers underneath the ABS ring and you might need another washer underneath the ABS sensor screw otherwise the sensor could scrape against the ring.

@jotjotde Thanks for the picture. I’m a bit puzzled, though, because on your actual disc the hole pattern looks quite different from the one shown on the EBC website (https://ebcbikes.com/products/ebc-ebc-hpsr-solid-disc-md618).

Edit: Just realized that the site isn’t the official EBC one. The official site (https://www.ebcbrakes.com/), however, doesn’t list the MD618 at all. This (https://auto-trend24.de/?id=MD618) looks like the real thing.

[jotjotde]

@jotjotde  , is this the one you are using?  Taller height is a real benefit.  18mm.

  The stock nut does not offer much material for the socket to grab on to.

https://www.probolt-usa.com/titanium-flanged-axle-nut-m25x-1-50mm-drilled-rear-wheel-tinut25150003dz2/

Sorry, I was away for some days.

@Pard   

That is exactly the nut I got from Pro-Bolt. It is not very thick (high) as well, but I never had any issues with removing or reassembly. The golden hue is disappearing slowly by the use but that's only cosmetics.

I strongly agree with Aaron to not use an aluminium nut here. It's the wrong material for this.
The front nut though is made of aluminium, but it is technically totally different. It's approx. 25 mm high and double secured by the two axle pincing srews.

The titanium axles for your other bike look surely nice! I already looked for something similar for our Energicas, but could not find anything.

[jotjotde]

@chisquare   

Yes, that latter one seems to be the right one. If you happen to travel through Germany I could sell you the contour disc from EBC for a bargain price.
I bought it bc it looks nice but I was afraid I will not get through the technical check next year because it is obviously not an original part.

As already mentioned, you will need 5 washers size M8 to fill the 'grooves' of the disc. Otherwise the screws would damage the ABS ring.

[chisquare]

Thanks for the info and the offer. To avoid the risk of failing next year's vehicle inspection, I went with a Brembo OEM disc as a replacement.