I am experimenting with a 140/80-17 for the rear. Currently have a Avon Distanza and it is wearing well. Have a set of Continental TrailAttack's to install when the Distanza's are ready to replace (soon).
2005 KLR 685
2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015