hi, i just bought an gt avalanche 2.0 men's bike today, and the seat is a tad too tall. I was wondering if its safe to cut an inch or 2 off the bike post for a more comfortable riding
ok thanks, there was a piece of paper on the manual that said do not go over or under the minimum and maximum insertion line else it will risk frame breaking, i can see how over-extending will cause that, but not sure on how fully inserting will stress the frame.
i presume this will void the warranty automatically?
also a hack saw and a metal filer will probably do the trick?
What they are worried about is that you will cut your post too short, removingthe mark for the min insertion line, and then put the post in without enough in the frame.
Don't know what the manual is on about, you want to take the minimum insertion line as the minimum as in you should always have the post inserted into the frame with that line below (preferably more) inside the frame.. It is not a maxmium. Lower away, no need to cut.
Thing is, if you need to have the post at that line (not lower or above) the only way to lower the seat is to cut the pole... at the top, and that aint happening as you're not going to be able to re attach the seat clamp. Only time this is different is with carbon seat masts which is part of the frame.
Wait, there's a maximum insertion line? Don't think I've ever seen one before. I can understand having one on a carbon aero bike, or interupted seat tube FS frame, but not on a standard tube mtb bike. Does the pole have a max insertion line? Maybe its jsut a generic manual and including road bikes (I did crack my road bike due to seatpole meeting frame)
thats says don't put the seatpole out beyond its minimum insertion or maximum extension, these two terms mean the same thing. There should be a line or mark on the seatpole that will either say minimum insertion or maximum extension, or it could be just a line. all you have to do is make sure that that marking is Inside the frame.
minimum insertion: means this is the absolute minimum amount of seatpost that needs to be INSIDE the frame for it to be safe
maximum extension: means do not extend the seatpost past this mark OUTSIDE the frame
It jsut depends on what terminology thta maker of the post put on it, they are just covering bases . Same marking, different wording, meaning the exact same thing.
Just put your seatpole down till it is comfortable. Job done.
Also I don't think you can cut the seatpole, well not in a way that would do what you want, you can only cut off the bottom, not the top, which won't help if you're not going to drop it under the minimum insertion line.
Just for reference the seatpole minimun insertion line is anywhere from 1to 4 inches inside the frame on all of my bikes
I bought a seatpost and when I install it, it seems that is just 15 to 20mm from the minimun insertion. Is it bad or is it ok since I still have 15 to 20mm extra inserted along the minimum insertion line.
brought it to the bike shop to try and get a medium size, as it turns out, the frame fits me quite well, a size smaller would be too small for me. I'm just not used to the seat being high on a mountain bike, so he cut off an inch off the post (doesn't void warranty as it does nothing to the frame) and now it fits perfectly!
So what you saying is that you could not out the post down as it would not go any farther down into the frame? And the minimum insertion had nothing to do with it?
Thanks, I tried it and I still have and extra inch from the minimum insertion
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