Offset, 2-bolt seatposts

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MileHighMark

Post subject: Offset, 2-bolt seatposts

Posted: Sun Mar 17, 2013 11:23 pm

Joined: Sun Apr 01, 2007 10:50 pm
Posts: 173

Looking for an offset (min 25mm) seatpost with a two-bolt clamp that doesn't suck. I tried a Ritchey Pro, but the shaft was a little undersized (I need 27.2mm). Basically looking for advice on models/brands to avoid. I'm especially interested in:

Deda Zero100
FSA K-Force
Truvativ Noir T40

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bricky21

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 2:22 am

Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1226

Deda has a really nice clamp(superzero carbon) with easy access to the bolts. I'm assuming the clamp is the same, or just as well laid out on the zero100.

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MileHighMark

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 3:12 am

Joined: Sun Apr 01, 2007 10:50 pm
Posts: 173

bricky21 wrote:

Deda has a really nice clamp(superzero carbon) with easy access to the bolts. I'm assuming the clamp is the same, or just as well laid out on the zero100.

Any problems with it "creeping" up or down?

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bricky21

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 3:14 am

Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1226

What do you mean? The angle of the saddle?

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MileHighMark

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 3:28 pm

Joined: Sun Apr 01, 2007 10:50 pm
Posts: 173

bricky21 wrote:

What do you mean? The angle of the saddle?

Yes. I have a Titec 2-bolt post that won't hold its angle.

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Rick

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 5:28 pm

Joined: Sat Aug 29, 2009 4:30 pm
Posts: 1162

Thomson Masterpiece Setback is nearly perfect in every way...except it is only 16mm setback.

Other than that, the FSA-SLK carbon seems pretty good, but a tad heavy. I think it is 25mm setback.

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mr_tim

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 9:40 pm

Joined: Sun May 31, 2009 8:47 pm
Posts: 854
Location: durp durp durp

MileHighMark wrote:

Any problems with it "creeping" up or down?

Its fine. I've put about 4k kms on the superzero I have without any issue @ > 75kg.

You only need about 75% of recommended torque. Just balance out the tightening between the two bolts as you go.

Deda is heavy though compared to Ritchey, wouldn't touch deda for any sort of ww considered build. Really disappointing when you put deda stuff on the scale, its always over.

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DJT21

Post subject: Re: Offset, 2-bolt seatposts

Posted: Mon Mar 18, 2013 9:50 pm

Joined: Sun Mar 27, 2011 7:35 pm
Posts: 43

Zipp make a decent seatpost with a solid 2 bolt clamp. They're only 20mm offset though, but the lower saddle rail cradle is extended to provide more support/wider range of adjustment.

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Fiery

Post subject: Re: Offset, 2-bolt seatposts

Posted: Tue Mar 19, 2013 12:14 am

Joined: Sat Mar 16, 2013 9:21 am
Posts: 12

MileHighMark wrote:

bricky21 wrote:

What do you mean? The angle of the saddle?

Yes. I have a Titec 2-bolt post that won't hold its angle.

How does it lose the angle? Do the bolts loosen? Does the saddle also slip forward/backward when this happens?

I don't have much experience with various takes on Campagnolo-style two-bolt clamps, but it's a very solid design and I'm really curious as to what it takes to make it not function properly.

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rmerka

Post subject: Re: Offset, 2-bolt seatposts

Posted: Tue Mar 19, 2013 12:38 am

Joined: Wed Mar 06, 2013 4:23 pm
Posts: 95

Have you considered the 3t Palladio? It doesn't have the two bolt design but it's splined so you wouldn't have that angle creep problem and its got a 25mm setback.

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MileHighMark

Post subject: Re: Offset, 2-bolt seatposts

Posted: Tue Mar 19, 2013 2:42 am

Joined: Sun Apr 01, 2007 10:50 pm
Posts: 173

Fiery wrote:

MileHighMark wrote:

bricky21 wrote:

What do you mean? The angle of the saddle?

Yes. I have a Titec 2-bolt post that won't hold its angle.

It's really hard to explain, so I'll post some pictures the next day or so.

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