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To seatmast or not to seatmast ?

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To seatmast or not to seatmast ?

Old 01-17-10, 06:12 PM
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To seatmast or not to seatmast ?

So I was quite surprised at the lbs when I saw this and couldn't find a way to adjust the height of the seatpost. Sure enough, there is no way to adjust it, because there is no seatpost. The owner went on to explain to me that these seatmasts are cut (permanently) to fit each individual rider.

I know there are cons to this. Like trouble reselling the bike.

But what are the pros ? Does the frame feel more stable, like when standing up for example ? Better energy transfer ?

What are your opinions on this ?

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Old 01-17-10, 06:39 PM
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Can't resell the bike. Can't account for periodic changes in flexibility, nor changes in pedal stroke. Cannot really even make any fore-aft adjustments (aside from going back, and then having to cut again), because that changes the effective distance to the pedals. Why? I am also interested.
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Old 01-17-10, 06:43 PM
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Not really true, all these types of designs have some degree of adjustment using spacers.

I've got a bike with an ISP and changing up to about 30mm is trivial. For any individual rider that's about twice the amount of available adjustment you'll ever need.
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Old 01-17-10, 06:45 PM
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Originally Posted by sideshow_bob
Not really true, all these types of designs have some degree of adjustment using spacers.

I've got a bike with an ISP and changing up to about 30mm is trivial. For any individual rider that's about twice the amount of available adjustment you'll ever need.
Oh, well then never-mind
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Old 01-17-10, 07:38 PM
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The purported upside is saving some weight, and increasing stiffness. The frame designer can run fibers the lenght of the seat tube, and doesn't have to reinforce the areawhere the seat stays seat tube, and top tube come together as much. Allowing less weight and and more design flexibility.

IMHO, I think there is a benefit here albeit small.

Couple of downsides. The biggest one is it makes it more difficult to pack for airline travel.

The other is resale. However, in my particular case I'm at the high end of fitting a M/L frame, anc cut off very little seat mast. Thus there are precious few people that would fit an M/l and not fit my frame as cut or shorter.

It can still be adjusted 2 cm, and of course can be cut shorter. The TCR Advanced can be adjusted 4cm IIRC.

Most importantly, Integrated seat masts make compact geometry frames look much better:

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Old 01-17-10, 07:44 PM
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Couple benefits that I see (I ride a CG1 ISP bike):

lower weight
increased stiffness (I can't feel it)
looks better.

disadvantages:

complication
crack the mast and buy a new frame
only minor adjustability

Also, on the PF CG1 case, it's not the best design. It makes a little noise and moves around a touch, and I cracked the first one I owned somehow.

It really depends on the specific design on the bike. Some have more adjustability, some are hideous (Madone).
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Old 01-17-10, 08:01 PM
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also with the pf cg1, you can cut off the mast completely and use a regular seat post if resale is a concern.
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Old 01-17-10, 10:27 PM
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How are these things cut ?

I don't suppose a saw will do the job...................
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Old 01-17-10, 10:33 PM
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Originally Posted by zeo_max
How are these things cut ?

I don't suppose a saw will do the job...................
Sure, with a hacksaw. Just like a steerer tube.
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Old 01-17-10, 10:35 PM
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hacksaw with a high TPI blade. I used a 32 TPI blade, two pipe clamps as guides, and then some electric tape to keep it from splintering along the cut.

Low pressure, high strokes, and clean your blade a lot (with water) because the carbon dust will muck up your blade.
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Old 01-17-10, 10:39 PM
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Originally Posted by sideshow_bob
Not really true, all these types of designs have some degree of adjustment using spacers.

I've got a bike with an ISP and changing up to about 30mm is trivial. For any individual rider that's about twice the amount of available adjustment you'll ever need.
unless you are a junior thats still growing

I cant afford on of them fancy rigs anyways
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Old 01-17-10, 10:55 PM
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Originally Posted by Flatballer
hacksaw with a high TPI blade. I used a 32 TPI blade, two pipe clamps as guides, and then some electric tape to keep it from splintering along the cut.

Low pressure, high strokes, and clean your blade a lot (with water) because the carbon dust will muck up your blade.
Damn, I was kinda joking when I mentioned the saw. I thought this was a highly professional procedure where specifications about fit were sent to a specialist in the matter. And he would have all kinds of fancy tools and stuff. I mean cutting a 6 grand carbon frame is a scary thing !
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Old 01-18-10, 05:55 AM
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Originally Posted by
Most importantly, Integrated seat masts make compact geometry frames look much better:

[IMG
https://i72.photobucket.com/albums/i165/bobstewart/303s.jpg[/IMG]
Matter of opinion here....personally I think most of them look worse.
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Old 01-18-10, 06:37 AM
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Originally Posted by zeo_max
Damn, I was kinda joking when I mentioned the saw. I thought this was a highly professional procedure where specifications about fit were sent to a specialist in the matter. And he would have all kinds of fancy tools and stuff. I mean cutting a 6 grand carbon frame is a scary thing !
Mine was one of the first TCR Team advanced made, and the first my LBS has sold, so we were both a little nervous about cutting it.

I measured the fit on my old bike. Had my LBS do a fit, and went to a fit specialist to check my fit before we cut the frame. Actually ended up cutting it 3 times in very small increments before it was right. The first cut was just to get the lip off so we could put a seat on it, then 2 more to dial it in. You can always cut off more, but you can't add it back (other than the 2cm of spacers).

As for the actual cutting, with giant, there's a metal sleeve that slides over the mast, and tightens down were you want it and you use that to cut along.
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Old 01-18-10, 09:38 AM
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Originally Posted by merlinextraligh
Mine was one of the first TCR Team advanced made, and the first my LBS has sold, so we were both a little nervous about cutting it.

I measured the fit on my old bike. Had my LBS do a fit, and went to a fit specialist to check my fit before we cut the frame. Actually ended up cutting it 3 times in very small increments before it was right. The first cut was just to get the lip off so we could put a seat on it, then 2 more to dial it in. You can always cut off more, but you can't add it back (other than the 2cm of spacers).

As for the actual cutting, with giant, there's a metal sleeve that slides over the mast, and tightens down were you want it and you use that to cut along.
This kinda makes me lean towards "not to seatmast"
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Old 01-18-10, 12:11 PM
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Could go halfway and do something like a Madone or BMC's recent Streampost models.
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