IF I use my 1975 Suntour Bar End Ratcheted shifters with a modern Shimano RD (Deroe M531) and a Shimano 7 speed HG cassette, and modern Shimano shifter cables/housings, WILL the RD shift each gear going from the smallest cog to the largest cog, WITHOUT the need to ‘trim’ the RD after each shift, especially when moving up in the large cogs????
Secondary question: If the SunTours would work without trimming, do they enough pull for a 7 speed cassette???
I have been using 8 speed Shimano Ultegra bar ends (BS-64) with a HG-50 7 speed cassette and like it, 1 click, 1 shift, no need to trim. Been curious about going back to using the SunTours rachets if the modern RD eliminates the need to “trim”. Would like to know if others have tried it and what the results are with respect to trimming.
Note, NOT looking for a debate on Index vs Friction. I think index is better, but I have trouble burying those nice SunTour bar ends & maybe I can use them if the RD eliminates trimming. YMMV and that’s great, diversity is good.
John Hawrylak
Woodstown NJ
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Your research task: find out how much RD moves with each ratchet of your 1975s. Then you'll be able to better assess compatibility with different cassettes of any maker/speed, as long as you get the respective cog spacing.
... It appears RD ratio is a critical variable that really deepens the analysis one would have to do bench top to get a feel for how a certain combo of bits would work in theory before trying. Personally, I think I'd be more inclined to just install the bits and see how they work before undergoing that much analysis, but it's educational to at least better understand how bits function together and the interplay between different parts of a system.
Did you measure the RD ratio's or are they a published value somewhere??
Do you happen to know the ratio for a Shimano Deore M-591-SGS?? I have this with a Shimano 9sp road cassette (4.34mm cog spacing).
The RD ratio would have to greater than 1.39 for the SunTour barcon 25mm travel to shift the 8 cog spacings on the 9 speed cassette (8 * 4.34)/25 = 1.39
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So, question: Is it generally true that above 10 speeds or perhaps 11 cable systems don't work very well, or at least, shifting quality degrades quickly compared to systems with fewer cogs and wider tolerances?
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Ben and Ted: So 11+ does not require electricity. Thanks, good to know, even if only for academic reasons.