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Seat collars(4 posts)

Seat collarsVon Zip
Oct 2, 2002 5:10 PM
Could someone explain to me why these exist, why they are on some bicycles, not on others and sold seperately? Should anybody have them, should everybody have them, or is it something to do with the strength on the frame material. Thanks, Erik.
I think that separate seat collars are good.Spoke Wrench
Oct 3, 2002 5:30 AM
It means that if you should ever strip out the threads in your clamping mechansism, which is fairly common, you can easily toss on a replacement. For what it's worth, I just looked and found that all of the aluminum bikes in my basement have them, which I assume is due to metallurgical reasons, and only one of three steel bikes has separate seat collars.
Not me. Binder bolts tighten better. nmdzrider
Oct 3, 2002 7:06 AM
Separate seat collar - thumbs upEric_H
Oct 4, 2002 3:07 PM
I think the reason why most steel and Ti bikes now have separate seat collars is due to manufacturing cost. Aluminium and carbon bikes really have no choice as the material properties do not leave much option. On a steel or titanium frame, it is much easier to just cut the seat tube, ream it, cut a slot and slide on a seat collar. Welding on "ears" on a Ti frame, like the old Merlins and Litespeeds may be more aesthetically pleasing. Ditto for a steel frame with a traditional seat lug and recessed binder bolt. There are also some steel designs like the Ritchey which use a threaded "fastback" seat post binder mechanism, where a seat bolt actually threads into the frame. These have incredible clamping power, but if the frame threads are damaged it is a much bigger problem.

To be honest, I prefer the separate seat collar. Most steel frames which use a lug design suffer from poor finishing and then there can be the hassle of trimming the binder bolt and nut to the right length. On the Ti frames, I remember some of the earlier Litespeeds and Merlins actually having the "ears" collapse to the point where they touched. It was then impossible to get the seatpost to stop slipping. I had a friend with a LS Classic suffer from this problem.

To be honest, the worst seatpost clamping mechanism I have ever seen was on an older Eddy Merckx steel frame, the Arcobaleno, circa 1995 (Columbus Neuron tubeset). It had some funky internal wedge integated into the frame and it did not hold the seatpost very well. I'm also not a fan of the binder-less Moser design, simply because one has a VERY limited seatpost selection.