Can't get my saddle level using Grand Cru Seatpost & Fizik Aliante

[jberenyi]

I currently own four bikes and all of them except for one is running the Velo Orange Gran Cru seatpost using the Fizik Aliante saddle. I have no problems whatsoever getting my Fizik Aliante saddles to level out on three bikes. However, recently I built up a 2006 Felt F1C and wanted to use the Grand Cru seatpost on her using the Aliante saddle. I tried several times to level the saddle but to no avail it will not. The rear bolt bottoms out before the tipped up nose of the saddle can reach level attitude. I checked my other bikes for seat tube angle and they are 73 degrees with the Felt being 73.5. I can't imagine .5 degrees limiting the Grand Cru's adjustment. Has anyone had this happen to them because I'm torn over it. Also, I called Velo Orange today and they commented this issue has happened only a few times in the last four years and they currently attribute the issue to seat tube angle but I beg to differ unless someone can convince me that .5 degrees is the true root cause. Using ACAD the delta in height for my saddle height requirement (31.496" from center of bottom bracket)is only .079". Did Fizik change their rail angle design from years ago because the one I am trying fit up is from 2007. I think what I will try is get the leveled out setup from the other bike and try it on the Felt. Crazy.

[MattTuck]

You suggested what I would try, which is using a seat post and saddle that you know works. If you are able to replicate the issue with a working saddle/post combination, then that would lend credence to the seat tube angle being an issue.

If not, maybe it is a bad unit that needs to be replaced, or some part of the machining on the threads isn't right.

Hope it works out.

[Louis]

Originally Posted by jberenyi

I can't imagine .5 degrees limiting the Grand Cru's adjustment.

If you're right at the limit, then even 0.001 degrees more would not be achievable. Granted it's a small amount, but a limit's a limit.

There may also be some manufacturing tolerances on both the seatpost and the saddle that are going against you. Check the length of the adjustment bolt.

[jberenyi]

Originally Posted by Louis

Check the length of the adjustment bolt.

Length of bolt is not going to help. The rear clamp is bottomed out and adding more length to the forward bolt will do nothing to help out.

[Lewis Moon]

I can't believe VO would make a post where you couldn't use it on seat angles up to 74+. Many "vintage" bikes had relatively steep SAs, and vintage seems to be their niche. Is the rear of the upper carrier in actual contact with the post? If so you might be able to use a round bastard file to remove some material. If it's the bolt, you may need a trip to Ace Hardware.

[Ralph]

Just get out the round file.

[Lewis Moon]

Originally Posted by jberenyi

Length of bolt is not going to help. The rear clamp is bottomed out and adding more length to the forward bolt will do nothing to help out.

Clamp it in a vise and use a file to remove some material.

[christian]

Originally Posted by Louis

If you're right at the limit, then even 0.001 degrees more would not be achievable. Granted it's a small amount, but a limit's a limit.

I, also, enjoy math. This made me LOL.

[ultraman6970]

Got a similar problem many years ago, we had to file a little bit plus file the lines in the clamp and the seatpost, looked smooth like a campagnolo one, worked fine for centuries. I believe was a cheappo kalloy.

[Ralph]

The fancy named seat post in the above picture....looks to me like a renamed Kalloy. Should be simple to fix. Just make the slot a tad longer.

[eddief]

when I turned around the lower clamping part. It seems it should be plain old reversible and not make any difference, but I think it did.

[eddief]

repeat.

[jberenyi]

Originally Posted by eddief

when I turned around the lower clamping part. It seems it should be plain old reversible and not make any difference, but I think it did.

Funny you mention that because I thought the same thing but it made no difference. The lower clamp is symmetrical.

I sent Fizik a question today asking if they have ever changed their rail design since 2006. We'll see what they say. Honestly, I believe it's either a seatpost manufacturing flaw or the saddle rail angle is not the same as the newer Aliante's I have. I look forward to tonight's check out.

[eddief]

not sure why it'd make a difference, but try to leave no stone left unturned.

http://velo-orange.blogspot.com/2014...per-clamp.html

[Mikej]

Let some air out of your back / front tire...