|105 RD range||kilimanjaro|
Sep 9, 2002 8:11 PM
|I have an old 105 RD (part of late 80s/early 90s biopace group). I want to increase my largest rear cog and can't find info on what is the largest cog the RD will accept.
Juding by the size of the rear cage I would guess that it is a medium cage at minimu. The rear cluster that came with the bike is 14-24 and I found 28t cogs on loosescrews.com. I would like to know if will work with the RD (I want to climb a few hills towing my kids). According to the sheldon brown website the current 105 doubles RD will accept up to 27T cog with a chain wrap of 29 (I will have chain wrap of 28 with the 28t cog so this chain wrap should not be a problem).
I am not afraid to look up the info myself if I only knew where to search.
Thanks for your help in advance.
|re: 105 RD range||Rusty Coggs|
Sep 10, 2002 4:35 AM
|I have used the old 105s with a 30 tooth large rear cog and they may handle more.Shimano spec was at least 28,which is typically conservative.|
|I don't know for sure, but I'd sure try it.||Spoke Wrench|
Sep 10, 2002 5:41 AM
|Back in the olden days long arm rear derailleurs routinely would handle a 34 tooth rear cog. I even had a Sun Tour AG Tech rear derailleur that would handle a 38 tooth rear cog! We didn't have separate road and mountain component groups back then. Your derailleur sounds to me like it came from the end of that era.|
|I had one of those 38 tooth rear cogs for loaded||scottfree|
Sep 10, 2002 9:03 AM
|touring in the mountains! Sigh. Size of my current inner chainwheel!|
|So that's two.||Spoke Wrench|
Sep 10, 2002 1:00 PM
|How many do you think they sold in total? Mine was on my original Schwinn Twinn tandem. I don't want to talk about the rest of the bike because I take ridicule badly.|| |