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Rear Axle position
On an older road bike with forward facing, horizontal rear dropouts is there an optimal axle position. I assume in reference to the rear derailer position. I suspected that it might effect the shifting but trying various positions seems to make no noticeable difference using a 9 speed cassette and friction shifters. -- Cheers, John B. |
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#2
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Rear Axle position
On 6/7/2017 3:13 AM, John B. wrote:
On an older road bike with forward facing, horizontal rear dropouts is there an optimal axle position. I assume in reference to the rear derailer position. I suspected that it might effect the shifting but trying various positions seems to make no noticeable difference using a 9 speed cassette and friction shifters. Most modern rear changers have dual pivot springs so the upper roller to sprocket distance stays relatively constant. Older single pivot designs will shift very differently with axle ahead or behind the top pivot, especially in extremis- near the limits of chain length/gear size. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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Rear Axle position
Slo, what changes in handling ?
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Rear Axle position
On Wednesday, June 7, 2017 at 1:13:10 AM UTC-7, John B. wrote:
On an older road bike with forward facing, horizontal rear dropouts is there an optimal axle position. I assume in reference to the rear derailer position. I suspected that it might effect the shifting but trying various positions seems to make no noticeable difference using a 9 speed cassette and friction shifters. There's no difference in shifting with modern derailleurs and there is no detectable difference in handling since the wheelbase is only changeable by about 2 cm at the most. |
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Rear Axle position
On Friday, June 9, 2017 at 11:31:41 AM UTC-4, wrote:
On Wednesday, June 7, 2017 at 1:13:10 AM UTC-7, John B. wrote: On an older road bike with forward facing, horizontal rear dropouts is there an optimal axle position. I assume in reference to the rear derailer position. I suspected that it might effect the shifting but trying various positions seems to make no noticeable difference using a 9 speed cassette and friction shifters. There's no difference in shifting with modern derailleurs and there is no detectable difference in handling since the wheelbase is only changeable by about 2 cm at the most. If the jockey wheel is directly under the cog the shifting is a bit more positive. Cheers |
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Rear Axle position
On Friday, June 9, 2017 at 9:35:23 AM UTC-7, Sir Ridesalot wrote:
On Friday, June 9, 2017 at 11:31:41 AM UTC-4, wrote: On Wednesday, June 7, 2017 at 1:13:10 AM UTC-7, John B. wrote: On an older road bike with forward facing, horizontal rear dropouts is there an optimal axle position. I assume in reference to the rear derailer position. I suspected that it might effect the shifting but trying various positions seems to make no noticeable difference using a 9 speed cassette and friction shifters. There's no difference in shifting with modern derailleurs and there is no detectable difference in handling since the wheelbase is only changeable by about 2 cm at the most. If the jockey wheel is directly under the cog the shifting is a bit more positive. Cheers I find that what happens is that the shift cable stretches a bit and the shifting becomes a little sticky. It you reset the centering it works well again. |
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