Can anyone provide an idea on what these were for?  Our friend Chris picked them up at auction recently, and offers the following observations:

Unusual with a splined hub. Actually only 1/2 splined. Rim is clincher and big (25 or 26"). Any guesses? Bigger than motorcycle or cyclecar. The hub is also centered, not set towards the back like a typical car wheel. Definitely all original, not modified.  They would take a 33 or 34" clincher tire, which confuses me.  The splined hub makes me think they were on the rear or drive wheels, otherwise they would take bearings to roll.


So...any ideas?