Originally Posted by
USAZorro
I thought I had seen a similar thread a while back, but I went back 25 pages (into October 22) and didn't see it. Feel free to add odd stuff you come across. If someone does find an older thread on the same general topic, I'll ask the mods to merge them.
I know we've all come across some curious things either while riding bicycles, or working on them. Recently, I was trying to tighten a saddle onto a seat pin so that it wouldn't swivel so easily. None of my wrenches could get a good purchase on the nut though.
Are you sure I didn't send that one to you? That's a bike share seatpost clamp, most commonly seen on first and second generation Spin bikes. You can replace the nut if you wish, but you'll be surprised how they'll tighten just fine with an adjustable wrench on one of the flats.
Gen 1 (incomplete, wrong front wheel):
Gen 2:
Gen 3 used the same saddle, but a conventional sandwich clamp seatpost (though they're non-remote dropper posts, so not so conventional).
The Gen 1 + 2 Spin clamps use a carriage bolt on one side and the pentagon nut on the other, similar to some of the Persons and Troxel saddles from the 1960's and '70s.
Need any more of those clamps? Spin closed down for good in South Florida (only responsible operator here, so quite a loss), so wound up with a few more spares from the warehouse.
-Kurt