Is this the most vertical seatpost you've ever seen?
01-22-22, 06:34 PM
#1
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Is this the most vertical seat tube you've ever seen?
Saw this bike on ebay, listed as a "Steel NJS Track" bike. I race, ride and collect track bikes, including a Makino and I've never seen such a steep seat tube. I can see how it allows the rear wheel to be closer in, shortening the wheelbase but how else would this affect the ride? Interesting to see how the non-parallel tubes makes the diamond shape less elegant to my eye...
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01-22-22, 06:43 PM
#3
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Yes
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01-22-22, 07:51 PM
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Pretty strange - it almost looks like it was designed to fit into a tight parking space like on a train or something.
01-22-22, 08:25 PM
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Polo sounds right clubman .
Especially if the straps are unique? IDK.
....but with different bars does track seem possible?
I have a road bike with about the same front tire clearance to the down tube, handling is quick as a hot snake, wherever your butt is in relation to the bottom bracket.
Especially if the straps are unique? IDK.
....but with different bars does track seem possible?
I have a road bike with about the same front tire clearance to the down tube, handling is quick as a hot snake, wherever your butt is in relation to the bottom bracket.
01-22-22, 10:02 PM
#6
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Some astute observations! I never thought of bike polo and confined spaces - like a cupboard
Seriously, I ride track bikes and can only imagine what it might be like to ride that bike. It seems like that seat tube would be like riding a PIKE!
Is it true that a more angled seat tube would be more compliant as it becomes less vertical?
Seriously, I ride track bikes and can only imagine what it might be like to ride that bike. It seems like that seat tube would be like riding a PIKE!Is it true that a more angled seat tube would be more compliant as it becomes less vertical?
01-22-22, 10:24 PM
#7
dork
I've seen track bikes with this steep of an angle before, but they're rare. My guess is Peloton just made it to a keirin rider's specs. Maybe an experiment, looking for an advantage within the strict rules.
01-22-22, 10:59 PM
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Originally Posted by Wildwood
Polo sounds right clubman .
Especially if the straps are unique? IDK.
Especially if the straps are unique? IDK.
01-23-22, 01:54 AM
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Originally Posted by delicious
My guess is Peloton just made it to a keirin rider's specs.
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01-23-22, 05:20 AM
#10
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I tested a brand new POS recently that had a very upright seat post, which, of course, put the cranks well under me as shown above. I couldn’t wait to get off the thing, just awful. I felt like I was falling forward all the time. I almost threw it in a ditch. But the Boss would have frowned.
Any ride longer than a minute or two and my legs would have cramped.
Must have been designed by someone who had never seen a bicycle, using one of those cartoon drawings of one that we all laugh at.
and “get off my lawn”
Any ride longer than a minute or two and my legs would have cramped.
Must have been designed by someone who had never seen a bicycle, using one of those cartoon drawings of one that we all laugh at.
and “get off my lawn”
01-23-22, 06:56 AM
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No
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01-23-22, 08:37 AM
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A steep seat tube shifts more weight onto the front wheel. If you ride it on the road, with a front brake, you need to brake carefully to avoid a face-plant.
01-23-22, 08:41 AM
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Originally Posted by SJX426
No
-Kurt
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01-23-22, 11:16 AM
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@cudak888 and @WGB - Not my bikes. Ran into the pics on the internet and saved them as curiosities! The question was "is this the most vertical seat tube you have seen?" The Bottecchia looks like it is about the same angle but on the other side of 90*. OK well a little more than.
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01-23-22, 11:41 AM
#17
WGB
SJX426 Sorry - I went off on a tangent when I saw the blue bike! I tried to blow it up and still couldn't read name. It's seriously cool in a weird way. Be interesting to know what make it is.
I also noted the comment by Wildwood about his having such a frame and how it handled and since this one looks to be set up as a tourer(?) I wondered what it would be like if you braked hard, with a full load, on a downhill..........
I also noted the comment by Wildwood about his having such a frame and how it handled and since this one looks to be set up as a tourer(?) I wondered what it would be like if you braked hard, with a full load, on a downhill..........
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01-23-22, 11:53 AM
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Originally Posted by WGB
SJX426 Sorry - I went off on a tangent when I saw the blue bike! I tried to blow it up and still couldn't read name. It's seriously cool in a weird way. Be interesting to know what make it is.
I also noted the comment by Wildwood about his having such a frame and how it handled and since this one looks to be set up as a tourer(?) I wondered what it would be like if you braked hard, with a full load, on a downhill..........
I also noted the comment by Wildwood about his having such a frame and how it handled and since this one looks to be set up as a tourer(?) I wondered what it would be like if you braked hard, with a full load, on a downhill..........
The quick-release fender mounts suggest a club-type bike - set up for both commuting (note headlight boss) and time trials (IIRC, informal group peloton racing was not legal in the UK at one point) - but I don't see any indication of rack mounts.
-Kurt
*Brain fart.
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Last edited by cudak888; 01-23-22 at 08:57 PM.
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01-23-22, 12:07 PM
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I guess there could be some similarities... Roller Bike?
Hold the phone... It's a FIXY... No rules allowed... RIDE ON!
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01-23-22, 01:30 PM
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Yes, it is the most vertical seatpost I've seen.
Aesthetically, I find it rather off, and not pleasing. Curious as to the angles and wheelbase.
Aesthetically, I find it rather off, and not pleasing. Curious as to the angles and wheelbase.
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01-23-22, 08:27 PM
#22
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Originally Posted by WGB
SJX426 What is the blue bike? It looks more like a tourer. Is it twitchy as well?
01-24-22, 11:44 AM
#23
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When I took the UBI framebuilding class in 2016, one of my classmates was building a polo bike frame. A very short wheelbase and upright seat tube were part of his design.
Modern triathlon bikes are built with more upright seat tubes to move the saddle further forward in relationship to the bottom bracket. This changes how the muscle groups are used so that it's easier on the body for the bike to run transition. @SwimmerMike might have more clarity on that.
With such a short top tube, this isn't a triathlon bike, most likely designed for bike polo.
Modern triathlon bikes are built with more upright seat tubes to move the saddle further forward in relationship to the bottom bracket. This changes how the muscle groups are used so that it's easier on the body for the bike to run transition. @SwimmerMike might have more clarity on that.
With such a short top tube, this isn't a triathlon bike, most likely designed for bike polo.
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Last edited by gugie; 01-24-22 at 12:26 PM.
01-24-22, 01:16 PM
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Originally Posted by gugie
When I took the UBI framebuilding class in 2016, one of my classmates was building a polo bike frame. A very short wheelbase and upright seat tube were part of his design.
Modern triathlon bikes are built with more upright seat tubes to move the saddle further forward in relationship to the bottom bracket. This changes how the muscle groups are used so that it's easier on the body for the bike to run transition. @SwimmerMike might have more clarity on that.
With such a short top tube, this isn't a triathlon bike, most likely designed for bike polo.
Modern triathlon bikes are built with more upright seat tubes to move the saddle further forward in relationship to the bottom bracket. This changes how the muscle groups are used so that it's easier on the body for the bike to run transition. @SwimmerMike might have more clarity on that.
With such a short top tube, this isn't a triathlon bike, most likely designed for bike polo.
Since you asked on the Triathlon set-up:
There's two reasons for the steep seat tube.
1) For better aerodynamics, you need to rotate more forward, the more you rotate, the better the aero position (to a point).
2) For running off the bike, the more forward position is supposed to save your hamstrings.
Back in the old days (early 90's when I started triathlons) the target was a 78-80 degree seat tube which effectively rotated you 4-7 degrees (Plus I end up "nose sitting") for even more rotation forward. I had a "forward" seat post that allowed me to move the seat about 3 inches forward of my road set-up and just swapped in the seat and post for "Aero work" and swapped it back for group rides or climbing.
The picture of me setting up my Triathlon-bike shows the forward rotation, if you picture a normal set up and rotated the picture it would the equivalent of me me riding on the drops. There's no way I could race for 56 miles on a 73-74 degree seat tube road bike in this aero of a position. I feel get at least 2 MPH of speed if I'm "on the bars".
Yeah, the position is supposed to help the hamstrings, I haven't personally picked up on this. I'm sure it's real, but I don't have any problems running off the bike from either type of bike.
Mike
01-24-22, 04:16 PM
#25
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That Peloton bike frame is only 47cm top tube according to the listing. There was no other way to fit a wheel in there. Are the wheels even 700c?
