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friction shifters linear gear shifts?
any hot ideas on how to adjust friction mechanisms to produce linear
shifts at both top and bottom rear cogs? |
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#2
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friction shifters linear gear shifts?
g.daniels wrote:
any hot ideas on how to adjust friction mechanisms to produce linear shifts at both top and bottom rear cogs? no such possibilitude due to constant radius of cable drum vs cosine error in derailer linkage unless you use an old coil-spring derailer like a benelux mark viii or vii ofcourse you could 'facture a fricter with variableradial cable drum sheldon "dontneed no steenking punctuationor shiftkey-dontcare if messageis comprehensibible" brown +------------------------------------------------------+ | You only get as strong as your smallest gear. | | If you only have one, that's how strong you get. | | -- Mike Shaw | +------------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
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friction shifters linear gear shifts?
g.daniels wrote:
any hot ideas on how to adjust friction mechanisms to produce linear shifts at both top and bottom rear cogs? I believe the friction shifter is linear in the sense that the amount of cable pulled is a linear function of the angular position of the lever. The derailleur may not linearly translate the cable-pull to the displacement of the cage, and I don't think that is adjustable. GH |
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friction shifters linear gear shifts?
Sheldon Brown wrote:
g.daniels wrote: any hot ideas on how to adjust friction mechanisms to produce linear shifts at both top and bottom rear cogs? no such possibilitude due to constant radius of cable drum vs cosine error in derailer linkage unless you use an old coil-spring derailer like a benelux mark viii or vii ofcourse you could 'facture a fricter with variableradial cable drum sheldon "dontneed no steenking punctuationor shiftkey-dontcare if messageis comprehensibible" brown I'm somewhat embarrassed to say it, but I understood you perfectly. -- Benjamin Lewis Don't take life so serious, son, it ain't nohow permanent. -- Walt Kelly |
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friction shifters linear gear shifts?
Sheldon g.danielized:
sheldon "dontneed no steenking punctuationor shiftkey-dontcare if messageis comprehensibible" brown wrote: I'm somewhat embarrassed to say it, but I understood you perfectly. You're well practiced from reading g.danielsese. -- Rick Onanian |
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friction shifters linear gear shifts?
Rick Onanian wrote:
Sheldon g.danielized: sheldon "dontneed no steenking punctuationor shiftkey-dontcare if messageis comprehensibible" brown wrote: I'm somewhat embarrassed to say it, but I understood you perfectly. You're well practiced from reading g.danielsese. It may also be from several readings of _Riddley Walker_ by Russell Hoban. -- Benjamin Lewis Gravity is a myth, the Earth sucks. |
#7
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friction shifters linear gear shifts?
right! i cudn't have writ it better.
butbubtut, i examined (loosely put) the problem or at least part of it on a long straight yesterday into the wind and alone on the wide mulsanne thus avoiding the SEE ROCK CITY signs and dirt bikers with friction shifters. and what i came up with bedies double vision wuza the: SHADOW GEAR!! the(ah expletive deleted i furgot to count it's teeth)3 cog down from the 34-32-shadow gear/28?-24? is a skip running with the small CR going to the 32 and to the 24 from the 32 unless the cable is turned pretty tightly. the 3 cog from the bottom does something likewise but not as often prefering to thrum instead. eye guess(whew that's along ways aback there)the linear fucntion is performed by the large CR and if needing accuracy so as to avoid physical damage to the pudendal area, scrotum, and ACL, the big CR is the way togo. the two 3 cogs on this non-linear setup takes significant effort(s) to get into even in the spread the wear riding mode but taking the hairpin flatout mode requires the extra cablescrew twist and the big CR. this is the reason or one of the reasons for index shifting on the new bike? |
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