Easier gearing on custom 80's bike with Shimano 600EX components
#26
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A garden variety Shimano 600 fd shifts a 26-36-42 triple just fine on my Miyata 1000. I read after my attempt at it that others have done the same. I also have a stock Suntour VXs front shifting a 28-36-46 with no problems at all fwiw. A triple sounds like the way to go with grades like that.
#27
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It's done and it (basically) works! The full extremes are extremely silly, as pictured, and they did have to change out the BB and put on a new chain which obviously cost more, but I now have a 28/28 lowest gear (total gearing pictured below) and at least accidentally switching into the extremes won't destroy anything. I'll keep an eye out for a cheap long cage or mountain rear derailleur, but this will certainly tide me over seeing as I'll never actually plan to use these cross-chaining situations.
Thanks again for the advice and apologies for the dirty bike!
Thanks again for the advice and apologies for the dirty bike!
#28
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I'm impressed that the rear derailleur can handle that much chain. You pushed the envelope on the capacity of this derailleur.
Velobase has the max chain wrap at 28 teeth: https://velobase.com/ViewComponent.a...5-ba7eb763d263
The 28 running on a 28 is a nice low gear for climbing.
Velobase has the max chain wrap at 28 teeth: https://velobase.com/ViewComponent.a...5-ba7eb763d263
The 28 running on a 28 is a nice low gear for climbing.
Last edited by bikemig; 07-27-23 at 03:27 PM.
#29
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This original document says this rear derailleur can manage a 34T cog size but only with 'SFR or PR fork ends' and google was not helpful with what that means.
#30
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I'm impressed that the rear derailleur can handle that much chain. You pushed the envelope on the capacity of this derailleur.
Velobase has the max chain wrap at 28 teeth: https://velobase.com/ViewComponent.a...5-ba7eb763d263
The 28 running on a 28 is a nice low gear for climbing.
Velobase has the max chain wrap at 28 teeth: https://velobase.com/ViewComponent.a...5-ba7eb763d263
The 28 running on a 28 is a nice low gear for climbing.
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#31
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That looks scary to me, especially when a long cage is the proper tool for the job.
#32
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Wow. The extremes are.... extreme. I'd find a GS cage RD as soon as humanly possible. I don't trust myself not to misremember where I am on the cassette and go full Biggie Bigs or Smallie Smalls.
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#33
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#34
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You did get lucky but you will want to seriously consider replacing the RD with a long case. This is not likely to be a good long-term solution.
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#35
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#39
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I’m pretty surprised this works. I probably would have gone for a longer cage derailleur. But, really, you’re rarely (never) going to be fully cross-geared, so what you’ve done ought to be ok! Nice!
#40
Good choices too. The m739 sgs has max take up of 38 and max cog of 32T. The gt cyclone mk1 has max take up of 36 and max cog of 32 or 34T depending on length of the hanger. The gt cyclone mk2 has a max take up of 34 and max cog of 34T
Last edited by kommisar; 07-29-23 at 03:17 PM.
#41
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Thank you all again for all of the advice and especially to jdawginsc for the long-cage RD-Z505 derailleur that I just finished installing (myself!) today. Hopefully these two photos cause less anxiety
My new gearing is a 52-38-28 triple up front and a 14-28 in the back. I'm not looking forward to the big hill, but it does seem much less daunting with a 1:1 gear ratio than it did with a 39 up front and a 28 in the back!
My new gearing is a 52-38-28 triple up front and a 14-28 in the back. I'm not looking forward to the big hill, but it does seem much less daunting with a 1:1 gear ratio than it did with a 39 up front and a 28 in the back!
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#42
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Whoop whoop!
Thank you all again for all of the advice and especially to jdawginsc for the long-cage RD-Z505 derailleur that I just finished installing (myself!) today. Hopefully these two photos cause less anxiety
My new gearing is a 52-38-28 triple up front and a 14-28 in the back. I'm not looking forward to the big hill, but it does seem much less daunting with a 1:1 gear ratio than it did with a 39 up front and a 28 in the back!
My new gearing is a 52-38-28 triple up front and a 14-28 in the back. I'm not looking forward to the big hill, but it does seem much less daunting with a 1:1 gear ratio than it did with a 39 up front and a 28 in the back!
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1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super, 1971 Raleigh International, 1998 Corratec Ap & Dun, 1991 Peugeot Slimestone
1987 Crest Cannondale, 1987 Basso Gap, 1992 Rossin Performance EL, 1990ish Van Tuyl, 1985 Trek 670, 2003 Pinarello Surprise, 1990ish MBK Atlantique, 1987 Peugeot Competition, 1987 Nishiki Tri-A, 1981 Faggin, 1996 Cannondale M500, 1984 Mercian, 1982 AD SuperLeicht, 1985 Massi (model unknown), 1988 Daccordi Griffe , 1989 Fauxsin MTB, 1981 Ciocc Mockba, 1992 Bianchi Giro, 1977 Colnago Super, 1971 Raleigh International, 1998 Corratec Ap & Dun, 1991 Peugeot Slimestone
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