[Tom Line]

We've always used enclosed drivetrains from our first bot back in '07.

Our method has always been to make the axle out of a shoulder bolt with a single nut. Pop the nut off and remove the axle and the wheel can drop out the bottom. Work on the chain to your heart's content, then replace the wheel. Of course, doing this requires exactly what Art mentioned - you have to know your centerpoints ahead of time, or use tentioners on the chains.

At nationals this year we were across from Wildstang. During pit setup day, they pulled their ENTIRE right drivetrain off with just a couple fasteners and serviced it. I pointed it out to our kids so they could get a couple ideas.