Thanks Steve. Why? I'm not sure this will answer your question but it tells a chain of events leading to the current fuel tank. I'd originally planned to use the frame tube of the bike as a small tank, but when I saw how small it actually was I opted to mount a peanut kit tank on the rear, but the peanut tank I had in hand was the smallest size, and I had the aluminum go cart tank so I built an aluminum frame for it, it held more fuel and looked pretty good as well. Unfortunately the frame I'd constructed, using aluminum scraps of an unknown alloy, started cracking...not on the welds, but here then there and the tank was listing here, then there as well. I'd collected some more peanut tanks of the larger variety by the time I finished my Daughter in laws bike (using one of the large peanuts for her bike) and by then I was starting my Spring bicycle fix and change so instead of using the spun aluminum tank on a new tank frame I fixed a 1" D O M tube to a couple of Harley Davidson tube clamps & the other peanut tank to the tube and called it good. Absolutely no reason 'cept I needed a fuel tank that wasn't going to fall off. I also really liked the "keg" look, but my choice of mounting materials sucked. That is the short version lol, but the keg look had some admirers as well, including me.
I'll use the keg and another very special rear mount fuel tank in the future, probably as aux fuel reservoirs...stay tuned.
I put the Simplex on the scales & it's 20 lbs. heavier than I'd thought at 150 lbs. wet. My Grubee was also heavier than expected at 70 lbs. fueled up Rick C.