#61
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Can you explain why a more upright seating position wants a slacker seat angle?
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#62
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This is why it doesn't work well to convert a traditional road frame (particularly a road racing frame) to upright handlebars. In the same way you can't replace north road handlebars with low aero bars either. In either case your seat wouldn't be able to find the bike's saddle. Popular American production road bicycles are commonly designed like racing bicycles that place an emphasis on speed over comfort. The rider is leaning over to reduce frontal area and supporting to weight of their upper body with with with their arms and core. Furthermore it looks good to have a lot of bar drop. If the emphasis is on comfort then moving the saddle rearward can take their weight off of their their hands. There is a saddle fore/aft position where the body is balanced over the pedals and no longer requires arm and core strength to support their upper body. Finding this balance point is part of the purpose of a fitting bicycle that has lots of adjustment. Finding a good fit is balancing aerodynamics, biomechanics and comfort. All 3 are in tension with each other. That is why fitting is more like an art form. Furthermore in the past the emphasis on fitting was increasing performance. This is all well and good until the rider realizes he is now too old to win the Tour and wants more riding comfort than speed. |
#63
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#64
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Last edited by Marvinlungwitz; 02-22-2024 at 05:38 PM. |
#65
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My personal experience is opposite to Doug's recommendation. In a position that is “racier”, I want more setback to balance the increased lean forward. Because these days my bars are even with my saddle, I find a 74 STA works best.
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#66
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#67
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Production frame design (particularly small frames) is generally based on front center (so the rider won’t hit the pavement when making a slow turn). One way this is achieved is with a steep seat angle. The result is that cyclists may not be able to try out a position with the seat further back. A general rule of thumb is that as one ages and gets fatter, less flexible and slower, they need to raise their handlebars to compensate. This results in their saddle needing to have more setback. This is especially true at the age of retirement. The problem with a general statement like mine is that all of our bodies vary resulting in exceptions. That is why I always encourage a fitting before getting a custom bike. |
#68
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#69
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I've aged and gotten less flexible and slower (not fatter). Raising the bars hasn't required more setback, it's the opposite because I am not as bent over. I can't find his post, but Dave Kirk explained how a more racing-style position requires the rider to move their butt back to balance their torso and keep weight off their hands.
I agree that if someone isn't sure if they have the best fit, they should pursue getting fit. But there are plenty of us who have worked out their fit on their own too. The proof in my case are long rides without pain. Quote:
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#70
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Trainers - Fluid vs Mag
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