Check out this weird seat post "clamp"
#1
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Check out this weird seat post "clamp"
Never seen this design before. Just a hole in the rear of the cluster. I assume you just screw a bolt that presses against the post?
#2
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If I am looking at it correctly, yes that is what it does. My wife has a Vitus aluminum frame road bike that has a short 5mm allen head bolt that presses against the seatpost, preventing it from moving. It has worked absolutely fine since the day that I built it up from a frameset.
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Some seatposts, like F. Moser, etc, have an expander like a stem. Some '90s Treks had it too IIRC. You needed a special wrench to work on these.
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I had a real high end huffy once that had a hole like that and the seat tube had a channel with a captured nut inside that gripped the flanges of the channel.
I've seen it on other "high end" department store bikes.
I've seen it on other "high end" department store bikes.