A shim should work, but as strange as it sounds you just may have the wrong size post. I know you probably got the size of the seat tube either from where you bought it, the frame mfr's website or from someone else, but it sounds like it's a couple tenths of a millimeter off.

 

empleo papel

I'm having problems with my seatpost slipping down.
Any ideas? Would a shim made out of a aluminum can work? Help!:madman:
Thanks,
Steve

Try a sheet of paper for a shim.:thumbsup:

 

QR clamps suck. Stick to the one you adjust with a allen key. Make sure you have a clamp that is the correct size for your seat tube. If you have one just one degree larger you might not be putting enough pressure on the post. Take it to your LBS and have them help you out.

 

Try rubbing either rock climbing or kids' sidewalk chalk on it. Seriously.

 

Its simply the wrong size :/

 

Its simply the wrong size :/

Anyone know where to buy a 27.3?

 

Try rubbing either rock climbing or kids' sidewalk chalk on it. Seriously.

Nat, I'll give the chalk a try. I stopped on the way home from my ride this morning and bought a box. It's strange, I've had this frame for about a year and a half using the same seatpost and just in the last few months it has begun to slip. I'll let you know how the chalk works.

Steve

 

Try a Salsa seatclamp. Holds my Thomson in place alot better then the stock did as well as 2 others that failed too hold it in place. Mostly cause it uses that cam thingy so the bolt doesnt bend when tightened very tight. Im using the Q/R version though but Im sure the one without would work just as good.

 

What worked for me.

I was having the same problem and what I ended up doing was making sure everything was clean and greased then made the clamp very tight, i.e. before I was making it so it took some force to close the clamp , but now I make it so I have to use quite a bit of force to close the clamp.

Good luck.

 

Thomson on a Behemoth. I use 1/2 of a water bottle seat post mount to give the seat a place to stop. I have to take my seat off to fit in my truck, and my knees despise change. This also prevents the post from slipping.

 

ditto on the chalk....have used it on 2 problematic bikes and voila, no mas slipping. best part is that there are usually plenty of neighborhood kids you can beat up and take the chalk from

 

Try rubbing either rock climbing or kids' sidewalk chalk on it. Seriously.

DING, DING, DING, DING, DING, We have a winner. I've got in several rides now with no slippage. Great call on the sidewalk chalk Nat, thanks.

Steve

 

DING, DING, DING, DING, DING, We have a winner. I've got in several rides now with no slippage. Great call on the sidewalk chalk Nat, thanks.

Steve

Cool, man. Now if only I could get anyone to believe me about using WD40 to mount grips...

 

Can't you just open the QR and tighten the allen wrench on the other side of the QR. Or at leat that what I did when I had to use a different seat and seatpost off a different bike.

 

I've purchaed 2 high-end bikes that had the wrong size post mounted. Off 0.2mm smaller. You wouldn't know until you try the right size & find it fits like a glove. Go to your bike's website & find out the correct size by emailing customer service.

 

I've purchaed 2 high-end bikes that had the wrong size post mounted. Off 0.2mm smaller. You wouldn't know until you try the right size & find it fits like a glove. Go to your bike's website & find out the correct size by emailing customer service.

All Lenzsports have a 27.2, but I think Steve knew that already.

Lenz's Customer Service Department! That's funny.

 

All Lenzsports have a 27.2, but I think Steve knew that already.

Lenz's Customer Service Department! That's funny.

Is his seat post 27.2? He never said he checked what the post he was trying was. BTW, there is variance you know in 1/100ths even w/ those that say 27.2 on the end of the post. I know that from experience w/ several really nice posts.

Ok, tell me why that is funny?

 

Is his seat post 27.2? He never said he checked what the post he was trying was. BTW, there is variance you know in 1/100ths even w/ those that say 27.2 on the end of the post. I know that from experience w/ some nice posts.

Ok, tell me why that is funny?

Steve isn't a neophyte, that's why I figured he'd know enough to look at his seat tube size and buy the seatpost marked with the same dimension.

It's funny because Lenz Sport is a one-man operation. Devin handles all aspects, which is why the idea of his Customer Service Dept. made me chuckle. I didn't really expect you to know that, but Steve would've.

 

I believe you.

Cool, man. Now if only I could get anyone to believe me about using WD40 to mount grips...

It works great. I haven't used it since all bikes got the Loc-On treatment though.

 

Question on the chalk thing. . .Doesn't putting chalk on the seatpost do the opposite of the grease thing? I mean, isn't the grease on the post for a reason? If you have an aluminum post in an aluminum frame, don't you NEED grease? Sell me some more on this chalk thing, because I have a slipping aluminum seatpost, but I feel I still need grease.

 

All Lenzsports have a 27.2, but I think Steve knew that already.

Lenz's Customer Service Department! That's funny.

My Lenzsport Behemoth uses a 30.9 diameter post and this is according to the Lenz's Customer Service Department (Devin).

 

I have had a slipping seat post for at least 9 months. I have replace the grease ( new grease) replaced the seat post , replaced the QR, and it still slips. not as much as before though. So when you you use the chalk do you have to remove the grease from the seat post. I am willing to try anything. oh yeah I am 220 clyde but that shouldn't matter, right?

Thanks ( great post by the way!)

 

My Lenzsport Behemoth uses a 30.9 diameter post and this is according to the Lenz's Customer Service Department (Devin).

Oh yeah, the Behemoth! Someone needs to contact Lenz's Marketing Dept. to have them update their website:

http://www.lenzsport.com/fullspec.html

Since Devin's so busy we might need to contact Administration (his mom) instead.

My Lenz Sport Bouldervore SP (no longer available) had what must've been a 27.15 seat tube. Dang that hole was tight. He reamed it out with a really cool cutting tool for me.

 

I have had a slipping seat post for at least 9 months. I have replace the grease ( new grease) replaced the seat post , replaced the QR, and it still slips. not as much as before though. So when you you use the chalk do you have to remove the grease from the seat post. I am willing to try anything. oh yeah I am 220 clyde but that shouldn't matter, right?

Thanks ( great post by the way!)

Yep, clean off all grease (degrease it or use rubbing alcohol if you have to) and then smother the post with chalk.

 

Question on the chalk thing. . .Doesn't putting chalk on the seatpost do the opposite of the grease thing? I mean, isn't the grease on the post for a reason? If you have an aluminum post in an aluminum frame, don't you NEED grease? Sell me some more on this chalk thing, because I have a slipping aluminum seatpost, but I feel I still need grease.

Just try it.