#25 Chain Drive Experience ???

[de_]

Just wondering what everyones experience has been with the use of #25 chain between the middle and outer wheels of a 6 wheel robot (ie 2 loops of #25 chain on each side of the robot). I'm hearing different stories and have seen broken robot #25 chains being changed on the field right in the intermission between finals rounds. I also hear it will stretch substantially more than #35 chain. I know 1310 has used it in past but was using #35 last year.

Also, anyone confirm that #35 chain in the above configuration doesn't stretch much at all, any slack accumulated appeared to us to be caused by wear on the aluminum sprockets (ie the slack remained even after replacing the chain with brand new chain).