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#1
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Stewart Warner speedometer.
I just built a 15 speed bike from old parts we had around here. I even
found my old SW speedometer which I had on my 26" Rudge back in the 60's. I installed it on this bike I just built and went out trail riding with a friend. He brought his GPS along so that we'd make it out of the woods but as an extra he also clocked our mileage. My speedo which as I recall used to be dead on the money when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? And if so is there any way to either recalibrate the SW speedo or alter the installation? Thanks, Lenny Stein |
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#2
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My speedo which as I recall used to be dead on the money
when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. -- "Bicycling is a healthy and manly pursuit with much to recommend it, and, unlike other foolish crazes, it has not died out." -- The Daily Telegraph (1877) |
#3
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My speedo which as I recall used to be dead on the money
when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. -- "Bicycling is a healthy and manly pursuit with much to recommend it, and, unlike other foolish crazes, it has not died out." -- The Daily Telegraph (1877) |
#4
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My speedo which as I recall used to be dead on the money
when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. -- "Bicycling is a healthy and manly pursuit with much to recommend it, and, unlike other foolish crazes, it has not died out." -- The Daily Telegraph (1877) |
#5
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On Tue, 07 Sep 2004 23:39:09 -0700, LioNiNoiL_a t_Y a h 0 0_d 0 t_c 0
m wrote: My speedo which as I recall used to be dead on the money when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. And the SW may be closer than the GPS in terms of distance that the wheel rotated through. A GPS produces its results via point-to-point displacement calculation over the smallest granularity of measurement space it supports, ignoring squiggles in the path between them; the speedo sees just the wheel rotations, and ignores direction. The result will often be different. I don't have a gps, but on the few occasions that I've ridden with someone who did, its distance measurement only agreed with speedos closely when the path was relatively straight. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#6
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On Tue, 07 Sep 2004 23:39:09 -0700, LioNiNoiL_a t_Y a h 0 0_d 0 t_c 0
m wrote: My speedo which as I recall used to be dead on the money when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. And the SW may be closer than the GPS in terms of distance that the wheel rotated through. A GPS produces its results via point-to-point displacement calculation over the smallest granularity of measurement space it supports, ignoring squiggles in the path between them; the speedo sees just the wheel rotations, and ignores direction. The result will often be different. I don't have a gps, but on the few occasions that I've ridden with someone who did, its distance measurement only agreed with speedos closely when the path was relatively straight. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
#7
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On Tue, 07 Sep 2004 23:39:09 -0700, LioNiNoiL_a t_Y a h 0 0_d 0 t_c 0
m wrote: My speedo which as I recall used to be dead on the money when it was on my English bike, is indicating that we traveled farther than his GPS indicates. Is this due to the fact that my present wheel is slightly larger than the original? A larger wheel will cause the speedo to read less distance travelled, not more, because it turns fewer revolutions over the given distance. And the SW may be closer than the GPS in terms of distance that the wheel rotated through. A GPS produces its results via point-to-point displacement calculation over the smallest granularity of measurement space it supports, ignoring squiggles in the path between them; the speedo sees just the wheel rotations, and ignores direction. The result will often be different. I don't have a gps, but on the few occasions that I've ridden with someone who did, its distance measurement only agreed with speedos closely when the path was relatively straight. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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