Saddle keeps going down over bumps!
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Saddle keeps going down over bumps!
I just got a new Dahon Broadwalk folder. I got it for Christmas and just recently took it on a bike path. When I ride over bumps or bumpy roads, the saddle keeps going down and have to pull over to lift the saddle up and lock the latch. Does anyone experience the same problem with Dahon saddle/post? What should I do? Please help. Thanks!
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clean and degrease the seat post and the tube with solvent. lubricate and tighten the quick release mech. should do it
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When I bought my Dahon, I watched part of the pre-delivery inspection. Saw the mechanic lubricate the pedal threads, and then the seatpost.
The damage (greasing the seatpost), was over before I could protest. I just brought the bicycle home, cleaned and degreased it. And sent them an email a week later after road testing.
The damage (greasing the seatpost), was over before I could protest. I just brought the bicycle home, cleaned and degreased it. And sent them an email a week later after road testing.
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Make sure you have the QR adjusted properly - the handle should meet resistance 90 degrees before it's final, resting position.
Had similar problem on my Boardwalk D7 (a previous bike). I went to an Aluminum seat post sleeve. That stopped the slipping, but it could/did cause some galling of the seat post itself. Not sure how much you weigh, but I'm 200 lbs, and that's likely a factor as my much lighter wife didn't have the problem.
Had similar problem on my Boardwalk D7 (a previous bike). I went to an Aluminum seat post sleeve. That stopped the slipping, but it could/did cause some galling of the seat post itself. Not sure how much you weigh, but I'm 200 lbs, and that's likely a factor as my much lighter wife didn't have the problem.
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I had this problem on my Mini; I had to take a file and slightly widen the slot in the seat tube, so the clamp could compress it a little more. I took off less than half a mm. After that, never had this problem again.
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I've had this problem with my folder (not a Dahon). Going over bumps and potholes in NYC forces me to stop every few minutes to adjust the seat. It's really annoying.
I was just sent a new seatpost so I hope that helps. (It's been showing here 3 days straight, I haven't had a chance to test it out...)
I was just sent a new seatpost so I hope that helps. (It's been showing here 3 days straight, I haven't had a chance to test it out...)
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My Merc Bike used to do this until I cleaned the seat post and tube with alcohol. I tightened the lever too and it stopped (pretty much). It does sink over a quite long period, but it used to go down half an inch in five minutes when it was new. Now I get weeks before having to adjust the post again.
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As a bike mechanic in the past I had to release stuck seat posts because of lack of grease. I saw cracked frames when people tried to release with a bench vise aluminum seatposts seized on steel frames. I also had the same problem of seatpost sliding down with one of my first MTB. I solved my problem cutting a strip of aluminum from a pop can and inserting it between the seatpost and the seat tube.
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bicycle mechanic or not..... this lets somebody believe that it is ok to grease the seatposts ...and I will get angry calls after that
DO NOT GREASE THE SEATPOST on a Dahon ....
PERIOD !!!
Keep it clean and put some more pressure on the quick release lever instead
NO GREASE !!
thor
DO NOT GREASE THE SEATPOST on a Dahon ....
PERIOD !!!
Keep it clean and put some more pressure on the quick release lever instead
NO GREASE !!
thor
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Seatpost
Right........DO NOT GREASE THE SEATPOST ON ANY BIKE. Keep it CLEAN. Every now and then put a couple of drops of sewing machine oil (or some other kind) on the quick realease lever. NO GREASE ON THE SEATPOST, THOR IS VERY CORRECT. I know all of this to be true because I started riding bikes the first week of Oct. 2008. A little knowledge is amazing to the ignorant.
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Greasing the seatpost is like many of the discussions in cycling, either you love it or you hate it. The point of grease on the seatpost is to avoid it seizes inside the frame. There is a simple alternative for grease that is once in a while to move the seatpost a bit up, down and sideways to avoid it seizes. This operation needs to be more frequent is the bicycle is exposed for long periods to the weather. I suppose this is not a problem in a folding bicycle because every now and then we fold the bicycles and we have to collapse the seatpost inside the seat tube, right?
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I think there is a case for grease to be made for aluminium seatposts in steel frames if, as caotropeus says, it's never moved - dissimilar metals. For alloy frames, due to similar metals, I think it's not necessary.
Peter Reich has recommended that you use Boeshield T-9 on the post, allow it to dry out overnight, and wipe off excess. I think what this is meant to do is fill in scratches to ret@rd oxidation of the alloy.
See this thread.
Peter Reich has recommended that you use Boeshield T-9 on the post, allow it to dry out overnight, and wipe off excess. I think what this is meant to do is fill in scratches to ret@rd oxidation of the alloy.
See this thread.
Last edited by jur; 01-22-09 at 11:03 PM.
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Greasing the seatpost is like many of the discussions in cycling, either you love it or you hate it. The point of grease on the seatpost is to avoid it seizes inside the frame. There is a simple alternative for grease that is once in a while to move the seatpost a bit up, down and sideways to avoid it seizes. This operation needs to be more frequent is the bicycle is exposed for long periods to the weather. I suppose this is not a problem in a folding bicycle because every now and then we fold the bicycles and we have to collapse the seatpost inside the seat tube, right?