I have butterfly bars and adapted my bar-end shifters with a set of thumbies. I used an old pair of Shimano brake levers from a friend. I converted my brakes to Alhonga deep drops, I think they are called. Much better stopping power than I had with my V-brakes, and important when carrying a load as your momentum downhill is much stronger. Am very pleased with the set-up. I got the thumbies from SJSC, and the brakes from Spa Cycle, both in England via email. Hope that helps.