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Max clearance of a Shimano 600 derailer,...(4 posts)

Max clearance of a Shimano 600 derailer,...Lone Gunman
Feb 17, 2002 6:20 PM
max number of teeth it can clear. Am looking at a 28 tooth freewheel, long cage is not an option. Will it work? If I use a hyperglide freewheel on the friction shift do I also need the hyperglide chain? Can a 7 speed freewheel fit onto a 126MM rear drops that is originally a six?
dont know if it will work but..johan burnt eels
Feb 17, 2002 6:32 PM
this may be a cheap way of finding out...

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1804533135&r=0&t=0&showTutorial=0&ed=1014007093&indexURL=0&rd=1

who knows???
re: Max clearance of a Shimano 600 derailer,...guido
Feb 17, 2002 7:28 PM
The old Shimano 600 derailleur will just barely clear a 28 tooth sprocket.

An "Ultra 7" freewheel will also fit in 126 mm dropouts. I tried a Sachs 7 speed recently, though, and it didn't fit.

The problem with Ultra 7 speed is that the outside sprocket is so close to the dropout, that when the chain jumps over to it, it frequently hits the seat stay.

6 speed freewheels leave a wider clearance between the last cog and the frame on 126 mm dropouts. The chain doesn't hit the seatstay. Also, with more room between the sprockets, you can feel the shift better in friction mode.
re: Max clearance of a Shimano 600 derailer,...Rusty Coggs
Feb 18, 2002 5:21 AM
Shimano spec on the 8 speed version was 28 teeth, and they will handle a few more.