Paul demonstrates how to correctly remove, lubricate and the re-insert (and tighten) a cam type seat post on a Bianchi carbon road bike.
Hello and welcome to this video. In this video we are going to show you how to adjust the saddle height on an internal cam system fitted to the Bianchi carbon road bike series of bikes. So if your Bianchi has got a traditional round seat collar this video doesn’t apply to you. This is purely for the internal cam system that sits just forward of the seat post and tends to be the one fitted to the more Aero style bikes.
So the things that you’re going to need for this are number one is masking tape. Why? Well, the reason being is that if you’ve already got a seat height that you’re pretty happy with, but for whatever reason, you want to just try a slightly different, either an elevated height or drop it slightly because you flexibility is out a little bit. Once you release this internal cam, it can drop or raise quite suddenly. So what I always recommend is to place a little bit of masking tape if you want to raise the saddle, just put a bit of masking tape where the seat post intersects the top of the frame – so you’re going to be lifting from there. And if you want to drop say three millimetres, put the masking tape just three millimetres above the seat post above the frame, and now you know where you’re dropping it down to so a little bit of masking tape.
So what I’m going to do, I’m just going to take a little piece just now and we’re going to just place the masking tape in line on the seat post to where the seat post intersects the frame. So that’s the first thing that we’re going to need is masking tape.
Next you’re going to at least need a four mm allen key and that is to undo and tighten the bolt backup. And ideally you’re going to have a torque wrench with an extended bar that can go into the bolt, again four millimetre end because the torque rating on this internal cam is six newton metres. If you don’t have a torque wrench, we can only ever recommend not touching this. However, if you are just using a standard allen key and going off feel please make sure you don’t over tighten it because you do not want to crack the frame or the seat post. So stay tuned past the jingle and we’ll go through how to adjust your seat post system.
Right so we’ve got our bike ready in the work stand at this moment, again, it doesn’t matter. I’m just having it here because it’s great for filming. It’s nice and stable. If you have the bike up against the wall or something like that, you can use it so don’t worry about being in a work stand, it just makes it really easy for me.
First thing that we need to do is understand what this internal cam system is. And once people understand how the system works, it makes it easier for understanding how to remove it. Because a lot of people with Bianchis think that once you’ve just undone the bolt slightly like a traditional seat collar arrangement, the saddle should just be able to lift up and down and it tends not to be the case. Bikes like Aria and Sprint are slightly easier with their seat post configuration, Oltre, XR3 and XR4with their slightly tighter, slightly more sculpted Aero seat pose can be quite tricky. But it’s a technique thing, not an issue with the seat post.
So, first thing that we need to do is place our four mm allen key into the bolt at the top, and we undo that allen key just a couple of turns. Okay. And you’ll feel that the seat post is still stuck. And this is where people think, Oh, it’s broken is it’s not working?
No, it’s absolutely fine. What we have to do is we have to release the internal cam that sits in here, and there are two ways it can be done. First way if it has been really well lubricated, and there’s plenty of anti-seize, and it’s more moved on a fairly regular basis and it’s cleaned, you can usually put your allen key in, push down on the top of the bolt, and you’ll hear it, click and release. And then you can lift your seat post up and down.
Okay, I’ve not pushed down on this by the way -it’s a brand new bike, but I’ve not pushed down because I want to demonstrate the second way of doing it. So if you push down on the top of the bolt, and it’s still not released, it’s probably because the cam has just got itself stuck a little bit. There might be a little bit of grit and debris that’s dropped down inside the seat post from road grime and rain and all that sort of stuff. So we need to be a little bit more vigorous. So what do we do?
Well, firstly, again, if the boat was on, on the floor, grab hold of the frame, grab hold of the seat post, and we want to just rock backwards and forwards. So again, slight rock down and we’ve released the seat post, what I’m actually going to do is I’m going to take the cam and the seat post out so I can show you what it looks like so you can get an understanding.
So top tip here, when you remove the seat post and the cam has come out slightly grab hold of the cam and grab hold of it. Okay, if you just pulled your seat post out, and the cam was still in here, it can fall down the seat post, and it’s a bit of a pain in the neck to to get hold off. So just make sure make sure that you grab the cam. Okay, I’m just going put the seat post down a second.
So this is our cam and hopefully you can see how it how it works. So there’s three parts. You’ve got your lower part, your upper part and the mid part and what happens is as you tighten the bolt down, this middle part starts sliding in and pushes this cam together. And as I say, it’s just that motion that basically locks the seat post into place. So the seat post is, is on this almost like fibre grip type system. So it’s held in place really, really well.
And then what happens is as you tighten the bolt up, these three pieces basically start pushing this middle piece of parts at the top and the bottom pushes the middle piece apart. And what that does is it pushes the seat post and this bit against the frame and that holds it in place. So what you’re doing by pushing down on the top of the bolt is releasing that cam and then suddenly, as you saw, it became easy to move.
So what’s really important and I’m about to do this now, is we lubricate in between all of these wedges. So we make sure that there’s no way that these will get seized or locked together. So that’s, that’s what I’m just going to do now and I’ll show you how to do it.
We’ve got the wedge, and now if we open up should just be able to see a good amount of anti seize in between the cams themselves. So that’s now anti seized together. So the cams are sliding apart nice and easily, but we’ve ensured that on the outside collars, and on this part here, there’s no anti seize on that because as I said, we don’t want the seatpost to slip, but we but we don’t want these to get seized together.
So that is now nicely lubricated. We now grab our seat post and settle again. And again, just the reverse – we want to make sure that the seat post is nice and clean. If bike had been ridden a while, just clean out the inside with a damp microfiber cloth to clean out the inside of the seat post to make sure all the grit and grime is gone. So that’s a good thing to do maybe every couple of months particularly if it’s been quite wet. Do make sure that you do take the seat post out on a fairly regular basis, clean everything up regress everything again and then you’ll not in years come when nothing’s been changed go Oh flip it’s seized. So it’s always a good principle to do soon.
So seat post back in and now you can see I’ve put a bit of masking tape on so we’ve got our datum to start with. Then we want to drop (now we’ve got enough seatpost in there) want to drop our cam back in. So that’s nicely back in. And say for example, we know where we’re going, we’re going up against that bottom of the masking tape, just there. So we now know our seat height is at the right position, we’re just going to take a standard four millimetre allen key just to start this process going because we just want a little bit of resistance.
Get the seat post to the right height. And that’s the cam in position and we’ve just got a little bit of tension on that now so that’s the cam in place. Now as I say, if you don’t have a torque wrench then you’ve got no alternative but to just use a standard four millimetre allen key, but again six newton metres is not a lot of tension. Do not over tighten this bolt, it can you know that cam is pushing against the seat post and it’s pushing against the frame. So you don’t want to damage any of the carbon in there.
We’ve set our torque wrench here to six newton metres. And we’ve got an extension bar on here because it just keeps the head away from the seat post. And we’re now tightening up and it’s now clicked. So that is now our seat post re-installed, cam in the right position pushed all the way down, bolt tightened up to six newton metres at the height that we’re looking for.
So that is how to adjust your seatpost on your carbon internal cam Bianchi. Thank you