It depends on the angle that my forearms are at when I'm holding the bars. On my GSX-R, my forearms are angled down, so I put the gloves inside the sleeves, if I can. On my GS, my forearms are just about parallel to the ground, so I leave the gloves outside the sleeves.
'09 R12GS, '05 GSX-R1000
Iron Butt # 4999, WERA/CCS EX # 666 (currently, expired), AMA Life Member
Racer, Drummer, Bassist, Software Engineer