[DonRotolo]

AndyMark AM14U kits (the KoP drivetrain) uses 15 mm belts.

The shifting transmission from WCD products (sold by VexPro) appear to be able to handle wither 2 9mm belts (6-wheel drive, center direct driven) or one 15 mm belt (4 WD or end wheel driven).

I guess your question is, is a 9 mm Gates HTD belt strong enough to replace, say, #25 chain in an FRC drivetrain? My speculation is yes, but I have not done the math. You can also call Gates and ask them, they have a room full of engineers just waiting to talk about cool stuff like robots...

Dunno, never tried it. Betcha CD has a pile of teams that did this and can share their experience with you. Let us know what you find!