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0 setback seat post?

Old 07-23-22, 01:28 PM
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Helderberg
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0 setback seat post?

Has anyone here used a 0 setback seat post and if so how did you like it? Did it fix the issue and what was it or make things worse?
Thanks in advance, Frank.
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Old 07-23-22, 02:05 PM
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A lot depends on bike geometry and your personal fit. I have used both zero setback and setback seatposts, depending on the bike. What issue are you trying to fix?
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Old 07-23-22, 03:20 PM
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Yes. I replaced my bikes setback post with one that has zero setback.

Why? Because I like to climb with my hands on the handlebar tops. With the saddle slightly forward, my hip angle is larger, and I can generate more force on the pedals.



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Old 07-23-22, 04:20 PM
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Originally Posted by Bald Paul View Post
A lot depends on bike geometry and your personal fit. I have used both zero setback and setback seatposts, depending on the bike. What issue are you trying to fix?
The saddle I am using now has shorter rails than my last saddle. The reach is different enough that I feel it in my shoulders and lower back.
Frank.
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Old 07-23-22, 05:51 PM
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Is your reach too long now? You have to consider your seated position relative to your BB, as well as to the bars. If the saddle needs to be moved fore or aft to correct the BB distance, you'll have to experiment with seatposts (0 or offset). If it's just reach, maybe a shorter stem would work for you.
I went for a professional bike fitting a couple of years ago. It was amazing how small differences in saddle fore/aft and stem length made the bike much more comfortable. Well worth the money, IMHO. In fact, I'm probably going to have another done to get my new bike properly set up.
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Old 07-23-22, 06:46 PM
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Originally Posted by Bald Paul View Post
Is your reach too long now? You have to consider your seated position relative to your BB, as well as to the bars. If the saddle needs to be moved fore or aft to correct the BB distance, you'll have to experiment with seatposts (0 or offset). If it's just reach, maybe a shorter stem would work for you.
I went for a professional bike fitting a couple of years ago. It was amazing how small differences in saddle fore/aft and stem length made the bike much more comfortable. Well worth the money, IMHO. In fact, I'm probably going to have another done to get my new bike properly set up.
I have changed from a saddle with long rails to a Brooks and can not get the saddle to BB dimension the same. My current seat post has an extension off the back that is great for rail support but hits the upward curve of the rails on my Brooks. Thought about cutting it but that would be a last resort. Thanks for your response.
Frank.
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Old 07-23-22, 07:49 PM
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I use zero offset posts on all my bikes, have for years. I'm long legged and can't lean forward like the old days. I like the bar high, maybe an inch and a half below the saddle..
After breaking several posts I started using Thomson posts and have never had an issue with one. The exception is the mtb which has a KS dropper which is also zero offset. That bike has a slack seat tube angle which puts me way back when I get it high enough.
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Old 07-23-22, 09:23 PM
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Thomson

I've used Thomson zero offset posts since they were first introduced back in the day

before that used Ringle Moby and Syncros posts on a few bikes

Last edited by t2p; 07-23-22 at 09:30 PM.
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Old 07-24-22, 04:15 PM
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Both my bikes have zero offset posts but that wasn’t why I got them. Long years with a Campy two bolt offset post and Ideale leather saddles spoiled me on having the adjustability of the two bolt design.

When I switched to more modern Volt saddles for different frames, the zero offset posts were what I could find in two bolt posts. Turns out the Volt has more range on the rails and can give similar positions on a zero offset post.

Otto
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Old 07-24-22, 08:06 PM
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You need this thread badly; The seat forward on old road-bikes thread....
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Old 07-25-22, 08:01 AM
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Originally Posted by beng1 View Post
Interesting read, thanks. As is normaly the case, the posters got a bit off topic but I do get what the subject of the post is.
Thank you, Frank.
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Old 07-26-22, 09:06 AM
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Originally Posted by Helderberg View Post
Has anyone here used a 0 setback seat post and if so how did you like it? Did it fix the issue and what was it or make things worse?
I used one once many years ago. I didn't buy it to fix an issue, I just needed a seatpost that would fit an old frame with an odd seatpost diameter and that was the only one I could find.
Turned out riding with a 0 setback seatpost caused an issue, and so I stopped riding that bike until I could find a setback seatpost to replace it with.
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Old 07-26-22, 10:30 AM
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Originally Posted by Bob Ross View Post
I used one once many years ago. I didn't buy it to fix an issue, I just needed a seatpost that would fit an old frame with an odd seatpost diameter and that was the only one I could find.
Turned out riding with a 0 setback seatpost caused an issue, and so I stopped riding that bike until I could find a setback seatpost to replace it with.
Could you explain what the issue is that the seatpost caused? Thank you for your post.
Frank.
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Old 07-26-22, 11:39 AM
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Originally Posted by Helderberg View Post
Could you explain what the issue is that the seatpost caused?
It was simply impossible to get the saddle into a position where I could fully engage the larger leg muscles (quads & glutes) during the power portion of the pedalstroke. I was too "on top of" the cranks. Getting a seatpost with ~25mm of offset resolved the issue nicely, allowing me to feel more comfortable during hard efforts and generate more perceived power (though I don't have any objective data to back up that last assertion).

fwiw nowadays all my bikes are set up with about 8cm of saddle setback [nose of saddle behind center of bottom bracket] but back then with a Thomson straight 0-offset seatpost, a Selle Italia SLR saddle, and this old (circa 1986) Bridgestone frame, I simply could not achieve that much setback.

Last edited by Bob Ross; 07-26-22 at 11:49 AM.
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Old 07-26-22, 12:02 PM
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In general, it's a mistake to alter the saddle fore-aft position to correct the reach to the bars. The fore-aft saddle position relative to the bottom bracket should be determined based on the proportion of the rider's weight supported by the handlebars (i.e.move the saddle back to reduce the weight on the bars, move it forward to increase the weight, bearing in mind that too much weight on the bars often leads to back, neck and shoulder pain). Only after that weighting has been determined should you adjust the reach to the bars by altering stem length.
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Old 07-26-22, 12:14 PM
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Having recently made that very mistake on my wife's bike, I have a nice Salsa carbon 30.9 mm zero-setback seat-post that hasn't been ridden on yet.
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Old 07-29-22, 04:36 PM
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I have a zero offset post on one of my bikes. The frame is about half a size too big for me and I seem to have short thighs for my height. The post puts me in a position more on top of the pedals. My knees are happier that way.
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Old 07-29-22, 09:37 PM
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Originally Posted by Bob Ross View Post
It was simply impossible to get the saddle into a position where I could fully engage the larger leg muscles (quads & glutes) during the power portion of the pedalstroke. I was too "on top of" the cranks. Getting a seatpost with ~25mm of offset resolved the issue nicely, allowing me to feel more comfortable during hard efforts and generate more perceived power (though I don't have any objective data to back up that last assertion).

fwiw nowadays all my bikes are set up with about 8cm of saddle setback [nose of saddle behind center of bottom bracket] but back then with a Thomson straight 0-offset seatpost, a Selle Italia SLR saddle, and this old (circa 1986) Bridgestone frame, I simply could not achieve that much setback.
Hi, Bob, I sympathize! I have the same desire, to have more saddle setback for better comfort and to better use the meager “old guy” strength that I have. I found a small collection of saddles which help me a lot to get a good setback position. The saddles are Specilized Toupe Gel, Selle AnAtomoica with rails that have 10 cm of straight saddle, a Ideale 92 which offers 2 cm more than a Brooks B17, I have a Rivet independence with 8 or 9 cm (Rivet says 9 cm but I recall measuring 8, but I can’t fix my measurement unless I ul it of the bike, and right now i like it!

For any saddle the limit of setback is the position of the forward end of the straight saddle rail and the front edge of the saddle rail clamp on the saddle. The saddle cannot be slid back any farther than that point. So getting setback is also about moving the seat post’s saddle clamp back. For thei I use the Nitto S-84 saddle, to get about 209 mm more setback than a Campy two bolt microdjust offers. These two measures result in a weird-looking bike.

To have a less weird looking bike you just need a frame which has i highly laid back seat tube. This is why I’m experimenting with a 1952 Redge 27”Clubman-style bike. This one and the Raleigh Super Lenton were the top “racer-boy” (translation: aspiring long-distance time trialers, such as Land’s End to John O Groats or London to Edinburgh and back. The way amateur cyclists now think they may be able to show the talent to go to TdF, amateurs tried to work up their skills to conceive of running ich great and classic time trials.

AAny case I’,m building up my Rudge to thrust it into service for another aspirational TT rider, me. But it has a 70 mm seat tube angle!

As a measurement I look at setback as the distance from a plumb line to the BB axis to the widest point of my saddle. This number lets me set up any saddle to satisfy my setback my criteria, if the non-saddle criteria (seatpost, setback) allow it.

A few take-always: use a saddle with a long straight rail, use a seat post where the addle clam is “pretty-far back” from the seat tube axis, and use a frame with a shallow 70 degree seat tube. I like to have 28 to 29 cm between my sitbone contact point and the BB plumb line This Type of measuring works for any saddle, odd ones like
Selle Anatomica, Rivet, and others, and more conventional racy saddles like Specialized Toupe, classic Brooks and Ideale, and Selle Italia.

I can also set reach practically by measuring from the widest point of my saddle to a line connecting the front of the hoods I can use this to develop the best reach, then transfer the measurement to other frames.

If folks want I can work up some pictures.
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