Seat post weight difference

Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping weight
which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1

Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ

Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in both
cases.

I do not care about weight, sturdiness is all that matters to me. At
around 430mm I'd get max amount of post in the seat tube so the 2nd one
would need to be sawed off a bit. This is for MTB use on rough trails
and because of a seat post mounted rack the stress on the post is quite
hardcore.

Of course, if someone can point out a good inexpensive brand that offers
450mm or at least 400mm in 31.6mm diameter that would also be nice.

--
Regards, Joerg

http://www.analogconsultants.com/

Op zondag 18 december 2016 01:54:30 UTC+1 schreef Joerg:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping weight
which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1

Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ

Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in both
cases.

I do not care about weight, sturdiness is all that matters to me. At
around 430mm I'd get max amount of post in the seat tube so the 2nd one
would need to be sawed off a bit. This is for MTB use on rough trails
and because of a seat post mounted rack the stress on the post is quite
hardcore.

Of course, if someone can point out a good inexpensive brand that offers
450mm or at least 400mm in 31.6mm diameter that would also be nice.

--
Regards, Joerg

http://www.analogconsultants.com/

100 grams for a seatpost of 18 dollars? That must be a typo.

Lou

On 2016-12-17 22:47, Lou Holtman wrote:
Op zondag 18 december 2016 01:54:30 UTC+1 schreef Joerg:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping weight
which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1

Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ

Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in both
cases.

I do not care about weight, sturdiness is all that matters to me. At
around 430mm I'd get max amount of post in the seat tube so the 2nd one
would need to be sawed off a bit. This is for MTB use on rough trails
and because of a seat post mounted rack the stress on the post is quite
hardcore.

Of course, if someone can point out a good inexpensive brand that offers
450mm or at least 400mm in 31.6mm diameter that would also be nice.

--
Regards, Joerg

http://www.analogconsultants.com/

100 grams for a seatpost of 18 dollars? That must be a typo.


Yes, that's what I also think. I want it heavy, thick walls and
aluminum. No carbon.

--
Regards, Joerg

http://www.analogconsultants.com/

On Saturday, December 17, 2016 at 4:54:30 PM UTC-8, Joerg wrote:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping weight
which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1

Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ

Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in both
cases.

I do not care about weight, sturdiness is all that matters to me. At
around 430mm I'd get max amount of post in the seat tube so the 2nd one
would need to be sawed off a bit. This is for MTB use on rough trails
and because of a seat post mounted rack the stress on the post is quite
hardcore.

Of course, if someone can point out a good inexpensive brand that offers
450mm or at least 400mm in 31.6mm diameter that would also be nice.

--
Regards, Joerg

http://www.analogconsultants.com/

The difference in seat posts is pretty amazing. The post itself makes a lot of different but the seat attachment mechanism varies widely. Three "light" posts I have vary between 200 and 300 grams. And all of these are heavier than the light post I have on the Eddy.

On 2016-12-18 08:58, wrote:
On Saturday, December 17, 2016 at 4:54:30 PM UTC-8, Joerg wrote:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping
weight which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1



Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ



Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in
both cases.

I do not care about weight, sturdiness is all that matters to me.
At around 430mm I'd get max amount of post in the seat tube so the
2nd one would need to be sawed off a bit. This is for MTB use on
rough trails and because of a seat post mounted rack the stress on
the post is quite hardcore.

Of course, if someone can point out a good inexpensive brand that
offers 450mm or at least 400mm in 31.6mm diameter that would also
be nice.

-- Regards, Joerg

http://www.analogconsultants.com/

The difference in seat posts is pretty amazing. The post itself makes
a lot of different but the seat attachment mechanism varies widely.
Three "light" posts I have vary between 200 and 300 grams. And all of
these are heavier than the light post I have on the Eddy.


Light stuff tends to break on my bikes. I want all the wall thickness I
can get. Normally I'd rather order a custom one from Andrew's store but
I want to try to mod a stock post in a way that some day I could have a
stash of four 18650 Li-Ion cells plus the charge controller/balancer
electronics in there, for lighting, MP3 and whatnot. Not sure yet how to
fasten all that in MTB-proof fashion but I'll hopefully figure that out.
My MTB buddy is a machinist and could make parts for inside if needed.

One little challenge will be to pipe out the wiring but I figure that
drilling on the sides won't harm the strength because most of the stress
should will be at the front and rear, with almost none on the side
centerlines.

I am leaning towards the Kalloy since there weren't any reports that it
bent on people. Got a question in about the true weight but if nobody
answers I'll take a chance.

https://www.amazon.com/Kalloy-31-6-4...ews/B00642QTS0

--
Regards, Joerg

http://www.analogconsultants.com/

On Sunday, December 18, 2016 at 2:29:54 PM UTC-5, Joerg wrote:
On 2016-12-18 08:58, wrote:
On Saturday, December 17, 2016 at 4:54:30 PM UTC-8, Joerg wrote:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping
weight which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1



Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ



Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in
both cases.

I do not care about weight, sturdiness is all that matters to me.
At around 430mm I'd get max amount of post in the seat tube so the
2nd one would need to be sawed off a bit. This is for MTB use on
rough trails and because of a seat post mounted rack the stress on
the post is quite hardcore.

Of course, if someone can point out a good inexpensive brand that
offers 450mm or at least 400mm in 31.6mm diameter that would also
be nice.

-- Regards, Joerg

http://www.analogconsultants.com/

The difference in seat posts is pretty amazing. The post itself makes
a lot of different but the seat attachment mechanism varies widely.
Three "light" posts I have vary between 200 and 300 grams. And all of
these are heavier than the light post I have on the Eddy.


Light stuff tends to break on my bikes. I want all the wall thickness I
can get. Normally I'd rather order a custom one from Andrew's store but
I want to try to mod a stock post in a way that some day I could have a
stash of four 18650 Li-Ion cells plus the charge controller/balancer
electronics in there, for lighting, MP3 and whatnot. Not sure yet how to
fasten all that in MTB-proof fashion but I'll hopefully figure that out.
My MTB buddy is a machinist and could make parts for inside if needed.

One little challenge will be to pipe out the wiring but I figure that
drilling on the sides won't harm the strength because most of the stress
should will be at the front and rear, with almost none on the side
centerlines.

I am leaning towards the Kalloy since there weren't any reports that it
bent on people. Got a question in about the true weight but if nobody
answers I'll take a chance.

https://www.amazon.com/Kalloy-31-6-4...ews/B00642QTS0

--
Regards, Joerg

http://www.analogconsultants.com/

Drilling holes in an MTB seatpost is almost guarranteed to result in failure of the seatpost sometime down the trail. Contrary to popular belief when riding on trails weight IS placed sideways on the post as well as fore and aft when you hit rough patches of trail.

Rather than putting batteries inside a seatpost why not pu8t them inside a tube that can then be securely fastened to the top tube of the bike?

Cheers

On 18/12/16 17:47, Lou Holtman wrote:
Op zondag 18 december 2016 01:54:30 UTC+1 schreef Joerg:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping weight
which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1

Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ

Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in both
cases.

I do not care about weight, sturdiness is all that matters to me. At
around 430mm I'd get max amount of post in the seat tube so the 2nd one
would need to be sawed off a bit. This is for MTB use on rough trails
and because of a seat post mounted rack the stress on the post is quite
hardcore.

Of course, if someone can point out a good inexpensive brand that offers
450mm or at least 400mm in 31.6mm diameter that would also be nice.

--
Regards, Joerg

http://www.analogconsultants.com/

100 grams for a seatpost of 18 dollars? That must be a typo.

Lou


Yep. Chigrams, similar to chilumens, except they under estimate on grams.

http://www.bicyclepartsoutlet.com/inventory/13627898/

Try 350g

--
JS

On 19/12/16 03:58, wrote:
On Saturday, December 17, 2016 at 4:54:30 PM UTC-8, Joerg wrote:
Looking for a MTB seat post that I could mod a bit I found large
differences in weight. This one is listed at 0.25lbs shipping
weight which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1



Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ



Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy in
both cases.

I do not care about weight, sturdiness is all that matters to me.
At around 430mm I'd get max amount of post in the seat tube so the
2nd one would need to be sawed off a bit. This is for MTB use on
rough trails and because of a seat post mounted rack the stress on
the post is quite hardcore.

Of course, if someone can point out a good inexpensive brand that
offers 450mm or at least 400mm in 31.6mm diameter that would also
be nice.

-- Regards, Joerg

http://www.analogconsultants.com/

The difference in seat posts is pretty amazing. The post itself makes
a lot of different but the seat attachment mechanism varies widely.
Three "light" posts I have vary between 200 and 300 grams. And all of
these are heavier than the light post I have on the Eddy.



I had a light-ish post that separated where the clamp section had been
_glued_ into the post.

Next post I bought was a forged Al post and clamp that is lighter still,
and probably much stronger. The clamp adjustability is better too.

--
JS

That post breaks after...6-7 years 5000/year

On 2016-12-18 11:42, Sir Ridesalot wrote:
On Sunday, December 18, 2016 at 2:29:54 PM UTC-5, Joerg wrote:
On 2016-12-18 08:58, wrote:
On Saturday, December 17, 2016 at 4:54:30 PM UTC-8, Joerg wrote:
Looking for a MTB seat post that I could mod a bit I found
large differences in weight. This one is listed at 0.25lbs
shipping weight which is something around 100 grams:

https://www.amazon.com/EVO-Barrel-Se...TS0?th=1&psc=1





Doesn't sound right. This one is 2" or 5cm longer but lists at about 400
grams or four times the weight:

https://www.amazon.com/MCTi-Alumium-.../dp/B015GQK6AQ





Can someone shed light on that huge difference? Could there be such a
major difference in tube thickness? The material is 6061 alloy
in both cases.

I do not care about weight, sturdiness is all that matters to
me. At around 430mm I'd get max amount of post in the seat tube
so the 2nd one would need to be sawed off a bit. This is for
MTB use on rough trails and because of a seat post mounted rack
the stress on the post is quite hardcore.

Of course, if someone can point out a good inexpensive brand
that offers 450mm or at least 400mm in 31.6mm diameter that
would also be nice.

-- Regards, Joerg

http://www.analogconsultants.com/

The difference in seat posts is pretty amazing. The post itself
makes a lot of different but the seat attachment mechanism varies
widely. Three "light" posts I have vary between 200 and 300
grams. And all of these are heavier than the light post I have on
the Eddy.


Light stuff tends to break on my bikes. I want all the wall
thickness I can get. Normally I'd rather order a custom one from
Andrew's store but I want to try to mod a stock post in a way that
some day I could have a stash of four 18650 Li-Ion cells plus the
charge controller/balancer electronics in there, for lighting, MP3
and whatnot. Not sure yet how to fasten all that in MTB-proof
fashion but I'll hopefully figure that out. My MTB buddy is a
machinist and could make parts for inside if needed.

One little challenge will be to pipe out the wiring but I figure
that drilling on the sides won't harm the strength because most of
the stress should will be at the front and rear, with almost none
on the side centerlines.

I am leaning towards the Kalloy since there weren't any reports
that it bent on people. Got a question in about the true weight but
if nobody answers I'll take a chance.

https://www.amazon.com/Kalloy-31-6-4...ews/B00642QTS0



--
Regards, Joerg

http://www.analogconsultants.com/

Drilling holes in an MTB seatpost is almost guarranteed to result in
failure of the seatpost sometime down the trail. Contrary to popular
belief when riding on trails weight IS placed sideways on the post as
well as fore and aft when you hit rough patches of trail.


There will be, but not nearly the forces forward or back. Back will be
highest because that's where yours truly lands when the rear tire hits
terra forma after having become airborne.


Rather than putting batteries inside a seatpost why not pu8t them
inside a tube that can then be securely fastened to the top tube of
the bike?


Not easy to do on an MTB with a freeform top tube and suspension mounts
underneath:

http://www.analogconsultants.com/ng/bike/Muddy3.JPG

Currently the battery and some other electric stuff rides in the gray
box under the rack. However, that adds a lot of force to the seat post
which I'd like to avoid. I'll also reduce from 8-cell to 4-cell and add
the freed up cells to the road bike because I found that I don't need so
much juice on the MTB (but ran out on the road bike a couple of times).
I have made a steel box that is smaller and will be mounted on top of
the rack boom, between seat post and fasting handle. Then it's closer to
the tube, less cantilever and also less prone to rock hits. Still,
inside the seat post would be ideal.

--
Regards, Joerg

http://www.analogconsultants.com/