Greasing Hubs on 2003 2720sl - Page 3

Speckul8r · 07-14-2008, 06:49 PM

How about the grease being a better medium to dissipate the heat than the air?

**ShrimpBurrito** · 07-14-2008, 07:01 PM

Or the friction coefficient of the tire/road surfaces being much higher that the bearing/spindle surfaces, thus the former surfaces generating more heat. Tires are designed to have grip/tread to maintain control; you want zero grip on bearings.

Dave

Speckul8r · 07-14-2008, 07:08 PM

Friction, a wonderful thing. Try this with the IR thermo. Which is cooler; spindle, wheel or tire? Works best when the brakes aren't connected. My bet it's wheel, spindle and tire.

**Bill** · 07-15-2008, 08:09 AM

Quote:

Originally Posted by PopBeavers

I have no explanation as to why the hub was about 15 degrees cooler than the tire surface.

The hub is cooler than the tire surface because the hubs are directly mechanically connected to a giant heat sink - the axle and the frame. Heat is generated by the tires, which are therefore at the highest temperature, and then flows "downhill" (just as water flows downhill) to a place that is lower.

Bill

07-15-2008, 11:33 AM

Well maybe, I'll do a more careful check next time we are on the road.

BK