Clydesdales/Athenas (200+ lb / 91+ kg) - Seat Sliding down

I'm new to biking having a problem keeping the seat up. I'm 245lbs and 6-6. The seat is up pretty high and when I get to going and bouncing down rocks and steep hills I have to stop and pull the seat up. Is there anything out there that can clamp the seat a little tighter? If so were can I buy them on the web. Thanks,

I'm new to biking having a problem keeping the seat up. I'm 245lbs and 6-6. The seat is up pretty high and when I get to going and bouncing down rocks and steep hills I have to stop and pull the seat up. Is there anything out there that can clamp the seat a little tighter? If so were can I buy them on the web. Thanks,
Yep.......
it's called a wrench or Allen Wrench;) Just watch you don't crimp the tube and if you have a carbon frame or seatpost, use a torque wrench to get it to the proper torque!:D

I have a seat spinning and thumb clamp now. It can with the bike. are you saying that there is another type of clamp??

seat binder

I have a seat spinning and thumb clamp now. It can with the bike. are you saying that there is another type of clamp??
Just change out the bolt to something else that requires an Allen wrench and use a ratchet with the appropriate size Allen Hex. Don't overtighten it or you can crimp the tube and seatpost, both. This weakens the structure of the bike seriously.

Get a second seat post collar clamp whatever. Instead of putting it on the frame tube mount it on the seat post itself. Best to buy from a LBS as sizing to a seatpost, not a tube, is non standard.

https://secure15.nexternal.com/shared/StoreFront/default.asp?CS=icycles&BusType=BtoC&Count1=889202296&Count2=806342720&Keyword=seatpost+clamp&Target=products%2Easp

I had the same problem with the cheapo clamp that came on my Specialized. After trying with no avail to get it to work, I went to the LBS and they sold me a rather stout clamp that you screw on with a allen wrench. Darn thing hasn't moved a MM since :).

I hate tohose clamps- get the mother replaced or tighten the hell pout of it. get it to your ideal height, get a pliars or something on the other end and make sure it doesn't move when spinning the actual clamp. then when it's too tight to use your hand, get a hammer and bash the hell out of it to turn it over and lock it. That's what I had to do after I got hit. The piece of crap was loose enough and A car hit me from the side, the whole seat spun as I fell. I fell onto it and I had literally black bruised nuts.

I get pliers or something on the other end and make sure it doesn't move when spinning the actual clamp. Then when it's too tight to use your hand, get a hammer and bash the hell out of it to turn it over and lock it.

Atta boy. No work is complete unless you take a hammer to it. You should see the hammer marks on my cranks after I got frustrated with a week of 'clicking' noises.

just buy a sugino seat binder bolt or a seat post clamp if it is a seperate peice and tighten that bad boy down with a wrench qr stuffs like that kinda stink

My carbon seat post was slipping even with the collar properly torqued to 45 in lb. I moved the red reflector clamp down to the post collar and tightened it. It is like two clamps and has kept the post from slipping down.

Specialized does have a technical bulletin on their web site that suggests a light sanding of a carbon seat post with 200 to 400 grit paper and applying powdered chalk to the post.

Get a second seat post collar clamp whatever. Instead of putting it on the frame tube mount it on the seat post itself. Best to buy from a LBS as sizing to a seatpost, not a tube, is non standard.

https://secure15.nexternal.com/shared/StoreFront/default.asp?CS=icycles&BusType=BtoC&Count1=889202296&Count2=806342720&Keyword=seatpost+clamp&Target=products%2Easp

+1
Get a collar that's similar to this. (http://www.bikepartsusa.com/product_info.asp?f_c=Seat+post&f_c2=clamp&cp=1&p=01%2D128310) That should fix it.

If not, this is from a slipping carbon seatpost BF discussion. You could try the paste for carbon posts. But usually aluminum posts require grease.

You can buy tacx carbon paste at competitive cyclist.

http://www.competitivecyclist.com/za...MODE=&TFC=TRUE

Grease/nogrease is a controversial subject. You can't go wrong though with paste designed for carbon. The general consensus among manufacturers is no grease. This makes sense to me because as you have seen, greasing requires much more clamping force to acheive the same friction force as without grease or with paste.

I think the risk of using nothing at all is getting your seatpost stuck.

One possibility nobody's suggested is that you have the wrong diameter seat post. It's unlikely, but it does happen, especially if you bought the bike used. A shop with a micrometer can measure it for you if it's not stamped on the post.
An old-time last-ditch fix if nothing else works is to put a little automotive valve-grinding compound on the post where it goes into the seat tube. That increases the friction, and by the time it grinds down the post enough to matter, you'll be dead. But a new binder bolt will probably do the trick.