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Main
Date: 24 Dec 2004 07:01:40
From: Ken Marcet
Subject: Seat angle?
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I am designing a new seat for my homebuilt SWB above seat steering bike, and
am a bit curious about what kind of angle people have on thier bents. I am
thinking that not too much more than 20 to 30 degrees off of the vertical
line would probably be a good angle to start with. Any comments of feedback
is welcome.
Ken
--
It has yet to be proven that intelligence has any survival value.
Arthur C. Clarke
English physicist & science fiction author (1917 - )
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Date: 24 Dec 2004 12:26:29
From: Just zis Guy, you know?
Subject: Re: Seat angle?
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On Fri, 24 Dec 2004 07:01:40 -0500, "Ken cet" <kccet@hotpop.com >
wrote in message <332erpF3slcl1U1@individual.net >:
>I am designing a new seat for my homebuilt SWB above seat steering bike, and
>am a bit curious about what kind of angle people have on thier bents. I am
>thinking that not too much more than 20 to 30 degrees off of the vertical
>line would probably be a good angle to start with.
Do you mean off the horizontal line? I usually ride with my seat 30º
above horizontal on my SWB OSS bike.
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Date: 24 Dec 2004 07:33:47
From: Ken Marcet
Subject: Re: Seat angle?
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"Just zis Guy, you know?" <uce@ftc.gov > wrote in message
news:qk2os0pp3r095n9hk7tdkl3g4bk16ecem1@4ax.com...
> On Fri, 24 Dec 2004 07:01:40 -0500, "Ken cet" <kccet@hotpop.com>
> wrote in message <332erpF3slcl1U1@individual.net>:
>
> >I am designing a new seat for my homebuilt SWB above seat steering bike,
and
> >am a bit curious about what kind of angle people have on thier bents. I
am
> >thinking that not too much more than 20 to 30 degrees off of the vertical
> >line would probably be a good angle to start with.
>
> Do you mean off the horizontal line? I usually ride with my seat 30º
> above horizontal on my SWB OSS bike.
>
Wow you ride pretty darn flat, no my original thinking was I guess more
along the lines of a "semi" recumbent seat, because I was thinking 20 to 30
degrees off the vertical so I guess that would be 110 to 120 from the base
of the seat which will be parralell to the ground.
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Date: 24 Dec 2004 12:10:18
From: Tom Sherman
Subject: Re: Seat angle?
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Ken cet wrote:
> "Just zis Guy, you know?" <uce@ftc.gov> wrote in message
> news:qk2os0pp3r095n9hk7tdkl3g4bk16ecem1@4ax.com...
>
>>On Fri, 24 Dec 2004 07:01:40 -0500, "Ken cet" <kccet@hotpop.com>
>>wrote in message <332erpF3slcl1U1@individual.net>:
>>
>>
>>>I am designing a new seat for my homebuilt SWB above seat steering bike,
>
> and
>
>>>am a bit curious about what kind of angle people have on thier bents. I
>
> am
>
>>>thinking that not too much more than 20 to 30 degrees off of the vertical
>>>line would probably be a good angle to start with.
>>
>>Do you mean off the horizontal line? I usually ride with my seat 30º
>>above horizontal on my SWB OSS bike.
>>
>
>
> Wow you ride pretty darn flat, no my original thinking was I guess more
> along the lines of a "semi" recumbent seat, because I was thinking 20 to 30
> degrees off the vertical so I guess that would be 110 to 120 from the base
> of the seat which will be parralell to the ground.
30 degrees from the horizontal is way upright. ;) See
<http://www.wisil.recumbents.com/wisil/costin/fmonkey.jpg > for a
reclined bike. :)
--
Tom Sherman – Near Rock Island
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Date: 24 Dec 2004 08:39:07
From: Arky Meedese
Subject: Re: Seat angle?
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"Ken cet" <kccet@hotpop.com > wrote in message
news:332gnqF3t1mmaU1@individual.net...
>
> "Just zis Guy, you know?" <uce@ftc.gov> wrote in message
> news:qk2os0pp3r095n9hk7tdkl3g4bk16ecem1@4ax.com...
>> On Fri, 24 Dec 2004 07:01:40 -0500, "Ken cet" <kccet@hotpop.com>
>> wrote in message <332erpF3slcl1U1@individual.net>:
>>
>> >I am designing a new seat for my homebuilt SWB above seat steering bike,
> and
>> >am a bit curious about what kind of angle people have on thier bents. I
> am
>> >thinking that not too much more than 20 to 30 degrees off of the
>> >vertical
>> >line would probably be a good angle to start with.
>>
>> Do you mean off the horizontal line? I usually ride with my seat 30º
>> above horizontal on my SWB OSS bike.
>>
>
> Wow you ride pretty darn flat, no my original thinking was I guess more
> along the lines of a "semi" recumbent seat, because I was thinking 20 to
> 30
> degrees off the vertical so I guess that would be 110 to 120 from the base
> of the seat which will be parralell to the ground.
>
Ken, horizontal is zero°. The origin is considered to be the your front
wheel with a direction vector towards your back wheel. This should get us
all talking in the same geometrical universe. Vertical would be 90°. At 110°
to 120° you would have your face in your crotch. 20° to 30° from vertical
would be 60° to 70° from horizontal. I think 45° is quite vertical enough
for a recumbent, and even at that you would carry a lot of weight on your
buns. The euro designers keep the seat back angle low so the big muscle
group up your back carries the body mass, and the glutes are free from
compression so you can get some power to the pedals.
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Date: 26 Dec 2004 16:19:10
From: db
Subject: Re: Seat angle?
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Have a look...
asme.pinetec.com/bio1999/data/pdfs/a0090747.pdf
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Date: 24 Dec 2004 12:07:27
From: Tom Sherman
Subject: Re: Seat angle?
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Arky Meedese wrote:
> ...
> Ken, horizontal is zero?. The origin is considered to be the your front
> wheel with a direction vector towards your back wheel. This should get us
> all talking in the same geometrical universe. Vertical would be 90?. At 110?
> to 120? you would have your face in your crotch...
From photographs, the Gold Rush [1] seat angle appears to be near 100
degrees (using the standard reference), as does the seat of the Cheetah.
However, these bikes were designed for maximizing sprinting power during
speed record attempts, and not for rider comfort.
[1] Not to be confused with the Gold Rush Replica, which is the
commercially sold bike that is a slightly modified of the Gold Rush chassis.
--
Tom Sherman
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Date: 24 Dec 2004 12:52:00
From: Just zis Guy, you know?
Subject: Re: Seat angle?
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On Fri, 24 Dec 2004 07:33:47 -0500, "Ken cet" <kccet@hotpop.com >
wrote in message <332gnqF3t1mmaU1@individual.net >:
>> Do you mean off the horizontal line? I usually ride with my seat 30º
>> above horizontal on my SWB OSS bike.
>Wow you ride pretty darn flat, no my original thinking was I guess more
>along the lines of a "semi" recumbent seat, because I was thinking 20 to 30
>degrees off the vertical so I guess that would be 110 to 120 from the base
>of the seat which will be parralell to the ground.
I don't think that's rekably flat, actually. SWB OSS bikes with
the BB above the seat are often set up this way, I think.
http://www.hpvelotechnik.com/
http://www.optimabikes.com/
http://www.challengebikes.com/
My view may be distorted by a Euro perspective (my bike is an Optima
Stinger), but most of the SWB OSS BB above seat bikes on these sites
seem to have seat angles well below 45º - any more upright and you
start to be too bent up to breathe properly (in my view anyway).
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Date: 24 Dec 2004 06:14:21
From: Tom Sherman
Subject: Re: Seat angle?
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Ken cet wrote:
> I am designing a new seat for my homebuilt SWB above seat steering bike, and
> am a bit curious about what kind of angle people have on thier bents. I am
> thinking that not too much more than 20 to 30 degrees off of the vertical
> line would probably be a good angle to start with. Any comments of feedback
> is welcome.
Where is the bottom bracket/crank spindle (BB) in relation to the seat?
The appropriate range of seat recline angles can not be determined
without this information.
Normal convention is to measure seat recline angle from an imaginary
horizontal plane. Therefore, a Tour Easy might have a seat recline angle
of 70 degrees, while a NoCom would have a seat recline angle near 20
degrees.
--
Tom Sherman
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Date: 24 Dec 2004 07:22:55
From: Ken Marcet
Subject: Re: Seat angle?
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"Tom Sherman" <tsherman@qconline.com > wrote in message
news:332fc0F3s5f13U1@individual.net...
> Ken cet wrote:
>
> > I am designing a new seat for my homebuilt SWB above seat steering bike,
and
> > am a bit curious about what kind of angle people have on thier bents. I
am
> > thinking that not too much more than 20 to 30 degrees off of the
vertical
> > line would probably be a good angle to start with. Any comments of
feedback
> > is welcome.
>
> Where is the bottom bracket/crank spindle (BB) in relation to the seat?
> The appropriate range of seat recline angles can not be determined
> without this information.
>
Okay well I didn't know that, this bike is still in the construction stage
and the final position of the bb/spindle has not been set into stone,
however according to my design plans the spindle will be about 1 & 1/2 to 2
inches above the seating surface.
Ken
> Normal convention is to measure seat recline angle from an imaginary
> horizontal plane. Therefore, a Tour Easy might have a seat recline angle
> of 70 degrees, while a NoCom would have a seat recline angle near 20
> degrees.
>
> --
> Tom Sherman
>
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Date: 24 Dec 2004 16:39:35
From: Mike Causer
Subject: Re: Seat angle?
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On Fri, 24 Dec 2004 07:22:55 -0500, Ken cet wrote:
> Okay well I didn't know that, this bike is still in the construction stage
> and the final position of the bb/spindle has not been set into stone,
> however according to my design plans the spindle will be about 1 & 1/2 to
> 2 inches above the seating surface.
Not really a high BB, but certainly not low. At 70deg from vertical you
are going to be folded over like Lance in full aero-tuck TT mode. If you
want to get an idea of what the commercial builders do, you'll find
details of seat angle(s), height and BB height for all the models of Trice
(Guy knows why I've been drooling here this afternoon), at
http://www.ice.hpv.co.uk/
You'll find that for speed the angle can be as low as 20deg from
horizontal, and at the "upright" end of the touring range, 50deg from
horizontal.
HTH
Mike
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