I purchased a used Chase Harper tank bag with the magnetic wings and a loop in the front. I attached the loop to a RAM Mount which kept it from falling off, but at 60 mph, the bag started going airborne, floating up off of the not-a-tank. Any suggestions to better secure this tank bag to the bike?
Choices from what others have done so far:
suction cups to the lid
drill a hole or two through the lid
straps or ties around the lid
straps or ties around the whole frunk
As you have discovered, magnets don't play we'll with plastics, but any strap mounted bag should work. Typically, you would attach a rear strap under the front of the seat and front straps at locations to the left and right of the steering head. Most strap mounts use quick release buckles that you can unsnap to gain access to the frunk. I'll confess, I haven't looked into tank bags for our bike, but I've used strap mounted bags on other bikes I've had with plastic tanks and they worked well. I installed a 46 liter top trunk and two 45 liter side cases, so I already have all the cargo volume I need.
I have been cogitating on this for a while. The trunk has largely removed the need for a tank bag but on tour I do miss having a map pocket on top of the tank and have been exploring solutions. I don't want to mar the smooth lines of the lid with an external sheet metal mount and in the past the straps and buckles of strap-on bags have marred the finish of a gas tank. Road grit got in the straps and took the gloss finish off the tank under the straps. My favorite tank bag is a strapless magnetic Cortec Mini and it would fit nicely within the area of the trunk lid. To experiment I removed the lid and placed a small business card-sized refrigerator magnet under one of the black trim pieces to see if the magnets in the bottom of the bag would stick. I found that those flexible refrigerator magnets don't stick to the magnets sewn in the tankbag unless there is absolutely no material separating them. That didn't work. Second experiment - the Cortec sticks really well to a metal cookie sheet so I am going to try and line the underside of the lid and trim pieces with thin sheet metal cut to fit exactly under the magnets in the bag. If this works I'll post the results.
Dave, wouldn't rare earth magnets epoxied in strategic locations work? Would these magnets interfere with electronic devices stored in the frunk? Magnets sounds easier than covering the inside with a sheet of metal. That is, as long as you get the polarity correct. Otherwise, your tank bag would levitate.
Your question is a good one and I considered them but didn't try them yet. The existing magnets in the bag are rather small - 6 of them about the size of a quarter - so the sheet metal cut exactly to fit would be small in area, like six bottle cap-sized circles. These would be glued strategically in place as you say but for an experiment I could tape them in place. I said "lining the underside of the lid" but that's not what I meant. Because the allowable space is limited and is a three dimensional convex curve rather than flat I think I could form thin sheet metal to fit into the three dimensional limited space but couldn't fit anything thicker. Gas tanks are made from thin sheet metal.
100% committed.......bolts through the lid.
Change my mind down the road............buy a new lid cover (silver part).
Still, at $85 for a new lid that is probably cheaper than a new tank bag. I like. Does it have a optional map pocket?