KTM OEM Hubs - Forged or Cast?

I always thought they were cast.

They look like they are cast like other OEM hubs but then finish machined on some of the surfaces.

not 100% on this as I've been out of the loop for a while, but if they are anything like the were a few years ago, they are cast aluminum that is then machined to get that finish on the inside. The right term would be "turned" though, not milled, as it would be done on a lathe, not a mill. Of course there are some operations that require milling on it. My best guess is that they are done on a live tool lathe.

Forged by Gods of molten alloy from the bowels of middle earth.

dcg141 wrote:

Forged by Gods of molten alloy from the bowels of middle earth.

That would be nickel. Al is from the crust of earth.

They are cast then machined. Per all the magazines notes from KTM they are CNC machined.

KTM Hub Fact of the Day: KTM hubs require all sprocket bolts to be torqued to 25.81 foot pounds (35nm) for proper and safe use. Improper torque can result in failure of said sprocket bolts and cause great injury/death.

AJ565 wrote:

They are cast then machined. Per all the magazines notes from KTM they are CNC machined.

Thanks. I also called Dan at Munn and he confirmed they're cast. What made me think they were forged was the magazines and company literature stating "CNC Milled".

peelout wrote: KTM Hub Fact of the Day: KTM hubs require all sprocket bolts to be torqued to 25.81 foot pounds (35nm) for proper and safe use. Improper torque can result in failure of said sprocket bolts and cause great injury/death.

Thanks for clearing that up.

peelout wrote: KTM Hub Fact of the Day: KTM hubs require all sprocket bolts to be torqued to 25.81 foot pounds (35nm) for proper and safe use. Improper torque can result in failure of said sprocket bolts and cause great injury/death.

You forgot to mention this has to be done every 30 minutes of ride time. Katoom Kaboom.

Honda's also do this. Torqued 32nm and loctited when I put it on. Its expensive when they go so I check torque regularly now.

AJ565 wrote:

They are cast then machined. Per all the magazines notes from KTM they are CNC machined.

rikhek wrote:

Thanks. I also called Dan at Munn and he confirmed they're cast. What made me think they were forged was the magazines and company literature stating "CNC Milled".

Forging and milling are not the same thing. And technically every hub is CNC machined to some degree. The flange where the sprocket mounts onto, the points where rotor mount, the mounting holes and spoke holes. All that stuff is CNC machined. So you could say that they are CNC machined but it would be kind of a gimmick

peelout wrote: KTM Hub Fact of the Day: KTM hubs require all sprocket bolts to be torqued to 25.81 foot pounds (35nm) for proper and safe use. Improper torque can result in failure of said sprocket bolts and cause great injury/death.

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