Seatpost Clamp Woes & Question

[smokeysmoo]

I had the same problem on my son's old BMX, which also clamped the same way as yours. I fixed it using a BMX seatpost clamp (no lip) on the seatpost. The trick is to find one that will clamp up far enough. I know the pogo I have on the SS will (at 28.6)

The reason I have the double on the Virtue is to counteract the known seattube cracking problems, that sent a lot of these frames to an early grave.

They don't seem to be the easiest thing to find now, and the sizes quoted seem like they wouldn't work either

Might be time to go and see Damian at DJ CYLES for a chat

 

[Heltor Chasca]

I can recommend Thompson clamps. Only about 5nm needed as they are very powerful so you shouldn't crush anything. Not sure how this is achieved. Unusual profile has some sort of mechanical advantage?

Lots of lovely colours. Orange. Go orange.

Just a thought. How about gripper paste? Sure it's for carbon, but worth a try. He says and you end up with an aluminium colon.

 

[Threevok]

Maybe able to get one on ebay - but that was just an example

As mentioned above Thompson would do just as well

Just to add to that, I seem to remember someone on another forum using a jubilee clip.

A bit ugly though

 

[smokeysmoo]

Just to add to that, I seem to remember someone on another forum using a jubilee clip.

VERY Fugly though

FTFY

 

[Threevok]

Actually this may fit the frame it you were to put the bolt at the front

http://www.chainreactioncycles.com/federal-invest-cast-bmx-seat-clamp/rp-prod141224

 

[I like Skol]

If the seat post clamp isn't clamping the seat post when tightened to the manufacturers specified torque then fire the problem back to the bike supplier rather than bodging it! If there is a product or inherent design fault on your very new bike then don't accept it.

 

[Salty seadog]

I'm finding the seatpost is slipping slightly on rides.

I was simply going to replace the clamp with a twin bolt jobbie, something like THIS, and use some carbon assembly paste, but, when I went to measure the seat tube for the clamp size I was reminded that the frame has braze ons that the current pinch bolt fits into.

This doesn't leave much room above them for a clamp.

So am I stuck with it, (I'll still whack some carbon paste on it anyway), or is there a way to fit a clamp to this frame, or any other better set up than just a pinch bolt?

BTW it only moves about an inch over 20 miles, but it needs sorting.

View attachment 365632 View attachment 365640

After all the replies, I like skol has the answer as it is a new bike. Also, have you actually tried it with just carbon paste? It's good stuff.

 

[biggs682]

If the seat post clamp isn't clamping the seat post when tightened to the manufacturers specified torque then fire the problem back to the bike supplier rather than bodging it! If there is a product or inherent design fault on your very new bike then don't accept it.

After all the replies, I like skol has the answer as it is a new bike. Also, have you actually tried it with just carbon paste? It's good stuff.

my sentiments completely , dont mess with it

 

[screenman]

Drill a large hole right through the frame and seat post and use a stonking great nut and bolt, trim the end off if it is sticking out or you might catch your leg on it.

Or of course, take it back to the shop.

 

[mickle]

If the seat post clamp isn't clamping the seat post when tightened to the manufacturers specified torque then fire the problem back to the bike supplier rather than bodging it! If there is a product or inherent design fault on your very new bike then don't accept it.

This ^^^^^^

Also, you could try taking the bolt out, greasing the threads & moving surfaces and cranking it back up again. Also worth checking that the bolt isn't bottoming out against itself before achieving the correct clamping force on the seatpost. This is usually easy to resolve by taking a mm or two off the nut with a file.

 

[Venod]

This is usually easy to resolve by taking a mm or two off the nut with a file.

Won't it still bottom out ? you will just have a narrower nut, a washer or threading the bolt further down the shank would cure it, or I have misinterpreted your suggestion?

 

[youngoldbloke]

Cheap solution for a collar to prevent the seatpost slipping down = http://www.wiggle.co.uk/cateye-light-clamp?sku=5300009103&source=igodigital

 

[smokeysmoo]

Thanks for all the replies so far.

I've got some carbon paste coming so I'll try that, but if it's still doing it after that then I will speak to the retailer about it

 

[Threevok]

Might sound like a stupid question - but is the reason your existing bolt isn't tightening enough, because it's running out of thread ?

If so, surely the addition of a washer under the nut would help ?

If not, please ignore

 

[gbb]

Might sound like a stupid question - but is the reason your existing bolt isn't tightening enough, because it's running out of thread ?

If so, surely the addition of a washer under the nut would help ?

If not, please ignore

Good point and worth checking. . sometimes we see the problem as complicated and often it's simple.