Seat post slides down
12-04-22, 09:42 AM
#26
Senior Member
Thread Starter
12-04-22, 09:46 AM
#27
Schwinnasaur
12-04-22, 11:10 AM
#28
Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,178
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Mentioned: 47 Post(s)
Tagged: 0 Thread(s)
Quoted: 3453 Post(s)
Liked 1,453 Times
in
1,132 Posts
Some seatposts are marked with their size. But some only had a sticker that falls off later.
If you do not have a good caliper to measure the diameter, you could wrap a piece of paper around it to measure the circumference. Then divide that by 3.14159 to get diameter.
A 27.2mm seatpost would have a circumference of roughly 85.5mm. I assume all you have to measure with is a tape measure or ruler.
If you do not have a good caliper to measure the diameter, you could wrap a piece of paper around it to measure the circumference. Then divide that by 3.14159 to get diameter.
A 27.2mm seatpost would have a circumference of roughly 85.5mm. I assume all you have to measure with is a tape measure or ruler.
12-04-22, 04:32 PM
#29
Schwinnasaur
Some seatposts are marked with their size. But some only had a sticker that falls off later.
If you do not have a good caliper to measure the diameter, you could wrap a piece of paper around it to measure the circumference. Then divide that by 3.14159 to get diameter.
A 27.2mm seatpost would have a circumference of roughly 85.5mm. I assume all you have to measure with is a tape measure or ruler.
If you do not have a good caliper to measure the diameter, you could wrap a piece of paper around it to measure the circumference. Then divide that by 3.14159 to get diameter.
A 27.2mm seatpost would have a circumference of roughly 85.5mm. I assume all you have to measure with is a tape measure or ruler.
12-04-22, 07:00 PM
#30
Senior Member
Thread Starter
12-04-22, 07:14 PM
#31
Senior Member
Thread Starter
12-04-22, 07:14 PM
#32
Senior Member
Thread Starter
12-05-22, 09:29 AM
#34
Senior Member
Thread Starter
12-05-22, 10:38 AM
#35
Ride more, eat less
Join Date: Feb 2007
Location: Philla PA, Hoboken NJ, Brooklyn NY
Posts: 2,070
Bikes: Too many but never enough.
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 713 Post(s)
Liked 733 Times
in
450 Posts
Consider the age of your frame, likely the seattube has expanded enough that original diameter seatpost is no longer fitting. That or seat clamp is worn out that you should consider replacement.
Either way, the picture you posted of your seatpost doesn't really help diagnose the problem of your seatpost slipping.
If it is an aftermarket suspension seatpost that you have been using, likely the diameter of the seatpost is not quite what you need.
Good luck with solving your problem.
Either way, the picture you posted of your seatpost doesn't really help diagnose the problem of your seatpost slipping.
If it is an aftermarket suspension seatpost that you have been using, likely the diameter of the seatpost is not quite what you need.
Good luck with solving your problem.
12-05-22, 06:43 PM
#36
Full Member
As I assume already suggested you could use a degreaser to remove any oil. You could also consider a double seatpost clamp if they are available for your size. Here is a model and I believe they maybe available with quick release. What it does is it’s one piece but has 2 different parts, one clamps around the frame as your standard clamp and another has a smaller diameter and clamps around the seat post providing additional friction.
Here is a sample of clamp without quick release but maybe they are also available with quick release for your seat post size.
Here is a sample of clamp without quick release but maybe they are also available with quick release for your seat post size.
12-06-22, 08:46 AM
#37
Senior Member
Thread Starter
Consider the age of your frame, likely the seattube has expanded enough that original diameter seatpost is no longer fitting. That or seat clamp is worn out that you should consider replacement.
Either way, the picture you posted of your seatpost doesn't really help diagnose the problem of your seatpost slipping.
If it is an aftermarket suspension seatpost that you have been using, likely the diameter of the seatpost is not quite what you need.
Good luck with solving your problem.
Either way, the picture you posted of your seatpost doesn't really help diagnose the problem of your seatpost slipping.
If it is an aftermarket suspension seatpost that you have been using, likely the diameter of the seatpost is not quite what you need.
Good luck with solving your problem.
12-11-22, 10:11 AM
#38
Senior Member
Join Date: Sep 2004
Location: Chicago area
Posts: 2,546
Bikes: Airborne "Carpe Diem", Motobecane "Mirage", Trek 6000, Strida 2, Dahon "Helios XL", Dahon "Mu XL", Tern "Verge S11i"
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 980 Post(s)
Liked 580 Times
in
398 Posts
Degreaser has been used on the seatpost, but has the inside of the seat tube been so treated? Residual grease might be the reason for the slippage.
(Voice of Experience speaking!)
(Voice of Experience speaking!)
12-12-22, 08:17 AM
#39
Senior Member
Thread Starter
12-12-22, 01:52 PM
#40
55+ Club,...
Join Date: Aug 2012
Location: Somewhere in New York, NY
Posts: 4,318
Bikes: 9+,...
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1111 Post(s)
Liked 842 Times
in
587 Posts
That bike you have, which you've CONSTANTLY asked for help with, is OLD. Get a new seatpost AND clamp and be done with it. Or add another clamp, which was also recommended for you to do. The bike is old and beat up. They don't last forever,...especially since it's what you use all the time.
__________________
If it wasn't for you meddling kids,...
12-13-22, 09:12 PM
#41
Senior Member
Join Date: Sep 2004
Location: Chicago area
Posts: 2,546
Bikes: Airborne "Carpe Diem", Motobecane "Mirage", Trek 6000, Strida 2, Dahon "Helios XL", Dahon "Mu XL", Tern "Verge S11i"
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 980 Post(s)
Liked 580 Times
in
398 Posts
Nothing wrong with trying to fix a bike just because it's old... but you now have several possible solutions to your problems.
Off-topic, it looks like you may have a crack in your seat tube radiating out from the "stress-breaker" hole at the bottom of the slot in your seat tube. The resolution of your original image isn't quite good enough to tell, but there's a white line extending circumferentially from the bottom of the slot. If this is a crack, it won't cause a catastrophic failure, but eventually you won't be able to lift the bike by the saddle without the seatpost coming out. (Ask me how I know!)
Likes For sweeks:
12-15-22, 04:13 AM
#42
Senior Member
Thread Starter
Well, if all else fails, degrease the inside of your seat tube and the seatpost using rags and a suitable degreaser. Acetone is a good choice with adequate ventilation and avoiding skin contact.
Nothing wrong with trying to fix a bike just because it's old... but you now have several possible solutions to your problems.
Off-topic, it looks like you may have a crack in your seat tube radiating out from the "stress-breaker" hole at the bottom of the slot in your seat tube. The resolution of your original image isn't quite good enough to tell, but there's a white line extending circumferentially from the bottom of the slot. If this is a crack, it won't cause a catastrophic failure, but eventually you won't be able to lift the bike by the saddle without the seatpost coming out. (Ask me how I know!)
Nothing wrong with trying to fix a bike just because it's old... but you now have several possible solutions to your problems.
Off-topic, it looks like you may have a crack in your seat tube radiating out from the "stress-breaker" hole at the bottom of the slot in your seat tube. The resolution of your original image isn't quite good enough to tell, but there's a white line extending circumferentially from the bottom of the slot. If this is a crack, it won't cause a catastrophic failure, but eventually you won't be able to lift the bike by the saddle without the seatpost coming out. (Ask me how I know!)
ok i have no idea where that is. i generally dont lift the bike via the seatpost. past experience has taught me not to. ebikes ae also way too heavy. i scoot the bike via the pannier rack or a lower part of the frame.
12-15-22, 05:00 PM
#43
Senior Member
Join Date: Aug 2015
Location: Delaware Sea Shore
Posts: 528
Bikes: There is always room for one more.
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 183 Post(s)
Liked 380 Times
in
222 Posts
I check this thread every day or so hoping the OP has solved his slipping seat post problem. Alas, no joy again today. 
__________________
Don
Don
Likes For GeezyRider:
12-18-22, 09:04 AM
#44
Senior Member
Thread Starter
nope i am trying. replaced the quick release thing(forgot what its called-had a spare one) and it works better. clamps hard but still if i go over bumps it tends to slip. just not as bad as before. sorry dont have time to check this every day
12-18-22, 11:12 AM
#45
Senior Member
Join Date: Aug 2015
Location: Delaware Sea Shore
Posts: 528
Bikes: There is always room for one more.
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 183 Post(s)
Liked 380 Times
in
222 Posts
Understood. Best of luck in solving the problem.
__________________
Don
Don
12-21-22, 09:42 AM
#47
Senior Member
Thread Starter
i went past a bike store i forgot about today and got this replaced. had a small ride after and seems to work. we discussed how i cud repair the split. might be able to find someone to weld it
12-22-22, 06:22 AM
#48
Senior Member
Thread Starter
Another day of riding with my trailer attached and its doing the right thing. so pretty happy. didnt think the cuff was the issue and maybe it was
