Bicycle Mechanics - Seatpost clamp size.---WTF--I hate this

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mitok
08-26-04, 09:06 AM
I'm pissed off. If you’ve been noticing, I’ve been asking a lot of questions due to my frame change not going as smoothly as I was hoping. Here is my next problem. My new frame is Magnesium and therefore the tubing is thinner than the old Aluminum bike. So naturally the seat post clamp doesn’t F-in clamp anything, it just presses against itself to the max and the seat post just moves however it wants. Now, I should mention that the seat tube size on the new frame is the correct one, just the tubing is thinner. Any ideas. And will I be able to find the right size clamp or I’m stuck doing modifications to the current one. Thanks.

sydney
08-26-04, 09:12 AM
I'm pissed off. If you’ve been noticing, I’ve been asking a lot of questions due to my frame change not going as smoothly as I was hoping. Here is my next problem. My new frame is Magnesium and therefore the tubing is thinner than the old Aluminum bike. So naturally the seat post clamp doesn’t F-in clamp anything, it just presses against itself to the max and the seat post just moves however it wants. Now, I should mention that the seat tube size on the new frame is the correct one, just the tubing is thinner. Any ideas. And will I be able to find the right size clamp or I’m stuck doing modifications to the current one. Thanks.They do come in different sizes. You measure your seattube and then start looking.
halfspeed
08-26-04, 09:35 AM
I'm pissed off. If you've been noticing, I've been asking a lot of questions due to my frame change not going as smoothly as I was hoping. Here is my next problem. My new frame is Magnesium and therefore the tubing is thinner than the old Aluminum bike. So naturally the seat post clamp doesn't F-in clamp anything, it just presses against itself to the max and the seat post just moves however it wants. Now, I should mention that the seat tube size on the new frame is the correct one, just the tubing is thinner. Any ideas. And will I be able to find the right size clamp or I'm stuck doing modifications to the current one. Thanks.

http://biketoolsetc.com/index.cgi?id=137869552302&nr=1&b=&c=Components&sc=Seatposts&tc=&q=&s=

If you can't measure and figure out the size you need yourself, your LBS shoudl be able to do it.

royalflash
08-26-04, 09:43 AM
you can buy shims if you don`t want to buy a new saddle post
sydney
08-26-04, 10:04 AM
you can buy shims if you don`t want to buy a new saddle postIt's not the post.It's the right size.
Retro Grouch
08-26-04, 10:31 AM
I'm kind of surprised that you say that the front derailleur clamp fits and the seatpost clamp doesn't.
mitok
08-26-04, 10:40 AM
I'm kind of surprised that you say that the front derailleur clamp fits and the seatpost clamp doesn't.

I haven't completely tested out the front derailleur, maybe it will slip once I start sifting and all but I’m pretty sure there is more slack to play with on the derailleur then the seat post clamp.
sydney
08-26-04, 02:47 PM
I haven't completely tested out the front derailleur, maybe it will slip once I start sifting and all but I’m pretty sure there is more slack to play with on the derailleur then the seat post clamp.The derailer clamp is the right size or it isn't.
supcom
08-26-04, 07:57 PM
If you don't have a dial caliper (an inexpensive and extremely useful tool you can get at Home Depot) then take the bike down to your LBS and let them fix you up. If you do have a dial caliper, measure the seatpost diameter and tell your LBS what size you need.

Personally I like to measure the size myself so I know I have the correct reading.