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Old 12-26-12, 02:49 PM   #1
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ti seat mast - compliance?

I know the weight savings with a mast are pretty minimal. A decent topper costs the same or more as a good alloy seatpost and the upcharge for a mast can be significant.

It seems like aesthetics are the main reason people go for a seatmast, but can this also be used as a place to tune the ride for a little more compliance?

I have to admit I'm a fan of the look, but that alone is not worth the extra cost and hassle, and if the tubing diameter/butting needed to make it safe and reliable are going to result in a jackhammer-like ride (compared to an alloy post) I would probably pass.
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Old 12-26-12, 04:46 PM   #2
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Cane Creek Thudbuster seat posts are a fine Option. I have a Long Travel one.

the rider weight is an elastomer density choice..

USE makes a Telescopic type they offer alternate coil spring - elastomer sets, to go inside them
to tailor the post to the rider weight.

German Airwings is another suspension seatpost , that is not cheap so the seat wont be wobbly ,
like the $25 ones.

Brompton had an alternate Titanium seat mast. they do offer some significant weight savings ,
since the standard one is steel.
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Old 12-26-12, 04:59 PM   #3
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I'm not looking for full-on suspension, but I suppose if I am in 10 years that's another reason to go with a standard seatpost.
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Old 12-28-12, 12:59 AM   #4
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What is a seat mast, other than a seat tube, seat post, or integrated seat tube/post?

If it is anything like any of the above, what you make it of is not going to have anything other than a psychological effect on "compliance". Posts make poor suspension, which sorta explains the devastating efficiency of swords, arrows, and spears. I suppose if one wanted to get some numbers on that sort of think, one could make a series of integral, solid, pogo sticks that use a variety of different metals, but no springs or bungies, and then just bounce around and see how relatively more or less compliant the various tubes are.

Now the bike friday Ti cantilevered tube is a whole other thing. Creepy in it's avoidance of the norms of engineering, but compliant no doubt.

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Old 12-28-12, 02:39 AM   #5
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Integrated seat tube/topper combo, like so.



I personally like the look, but there are a lot of strikes against it from a practicality standpoint. Just wondering if there anything more in the plus column.
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Old 12-28-12, 10:11 AM   #6
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I've felt that the popularity of the intergrated post/mast designs is mostly marketing. Sure some very minor weight/flex measurements can be had. But by changing wall thickness or diameters equal changes can be made without differing design basics. But these days the drive to make your product stand out above the masses is strong and if your product sells because of the style change you gave it then the industry is going to copy that style. Add in having a doped up racer win on the style and you have a marketing win.

It is interesting that the industry has to sell flexibility at the same time it sells stiffness. Let's see, we'll make the wheels and bars so stiff that we need deep padded tape and quasi suspension. Kind of like the linear brakes having the spring loaded noodles, sell the power of the arm design then dummy it back for the masses. Andy.
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Old 12-28-12, 12:06 PM   #7
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Quote:
Originally Posted by Andrew R Stewart View Post
I've felt that the popularity of the intergrated post/mast designs is mostly marketing. Sure some very minor weight/flex measurements can be had. But by changing wall thickness or diameters equal changes can be made without differing design basics. But these days the drive to make your product stand out above the masses is strong and if your product sells because of the style change you gave it then the industry is going to copy that style. Add in having a doped up racer win on the style and you have a marketing win.

It is interesting that the industry has to sell flexibility at the same time it sells stiffness. Let's see, we'll make the wheels and bars so stiff that we need deep padded tape and quasi suspension. Kind of like the linear brakes having the spring loaded noodles, sell the power of the arm design then dummy it back for the masses. Andy.
I'm with you on the stiffness arms race being a little silly. Having a bike that steers exactly where you point it and responds to turning the pedals well is great, but not if you lose fillings riding the thing. FWIW what I have in mind overall for the bike is a standard 1 1/8" head tube, clearance for fenders and 28mm tires, and a good ol' steel fork with curved blades. Maybe even post mounted centerpull brakes. Not a wannabe race bike by most people's standards.

*If* I go custom the mast thing becomes a possibility. If it's a stupid idea it's a stupid idea. I can accept that. I just want to have all the information to make an informed decision.
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