Ducati Monster Forum

Moto Board => Tech => Topic started by: Teutonics on September 17, 2008, 07:19:28 PM

Title: 25mm rear axle torque value?
Post by: Teutonics on September 17, 2008, 07:19:28 PM
I searched, and couldn't find it...

I have the factory s/m for my bike, but the manual is an '00 and my bike is an '02.  The torque value in the manual is for a 17mm rear axle, and mine is a 25mm axle.  The torque spec stated for the 17mm is 72 Nm, but is it different for the 25mm?

TIA!!!
Title: Re: 25mm rear axle torque value?
Post by: ducpainter on September 17, 2008, 07:25:11 PM
Quote from: Teutonics on September 17, 2008, 07:19:28 PM
I searched, and couldn't find it...

I have the factory s/m for my bike, but the manual is an '00 and my bike is an '02.  The torque value in the manual is for a 17mm rear axle, and mine is a 25mm axle.  The torque spec stated for the 17mm is 72 Nm, but is it different for the 25mm?

TIA!!!
I don't know the answer, but if the rear is hollow like the front...

I'd use the same value...

which is 63 Nm with greased threads
Title: Re: 25mm rear axle torque value?
Post by: Howie on September 17, 2008, 07:29:26 PM
83 Nm, same as the ST.
Title: Re: 25mm rear axle torque value?
Post by: ducpainter on September 17, 2008, 07:36:18 PM
Quote from: howie on September 17, 2008, 07:29:26 PM
83 Nm, same as the ST.
Is it solid Howie?
Title: Re: 25mm rear axle torque value?
Post by: Speeddog on September 17, 2008, 07:40:58 PM
<howie voice>

No, it's hollow.

</howie voice>
Title: Re: 25mm rear axle torque value?
Post by: ducpainter on September 17, 2008, 08:00:08 PM
Quote from: Speeddog on September 17, 2008, 07:40:58 PM
<howie voice>

No, it's hollow.

</howie voice>
<dp voice>

Weird that the same fastener on a similar shaft size takes a different torque.

</dp voice>   ;D
Title: Re: 25mm rear axle torque value?
Post by: Teutonics on September 17, 2008, 08:11:32 PM
Awesome, thanks for the quick response!!!
Title: Re: 25mm rear axle torque value?
Post by: Howie on September 18, 2008, 08:17:20 PM
Quote from: ducpainter on September 17, 2008, 08:00:08 PM
<dp voice>

Weird that the same fastener on a similar shaft size takes a different torque.

</dp voice>   ;D
From the factory manual:
Front wheel nut M 25x1.25 63 * GREASE B
Rear wheel shaft nut M 25x1.25 83 * GREASE B
No idea why.
Title: Re: 25mm rear axle torque value?
Post by: Speeddog on September 19, 2008, 10:38:29 AM
I haven't done a calculation recently, but IIRC, chain tension plus forward thrust at the rear axle can be ~1500 lbs at WOT in 1st gear, so that makes sense to me to have more pinch.
Title: Re: 25mm rear axle torque value?
Post by: Howie on September 19, 2008, 08:19:44 PM
Quote from: Speeddog on September 19, 2008, 10:38:29 AM
I haven't done a calculation recently, but IIRC, chain tension plus forward thrust at the rear axle can be ~1500 lbs at WOT in 1st gear, so that makes sense to me to have more pinch.

Definitely makes sense.