Chain Ring Diameters
Does anyone know, offhand, what the outside diameters are of 53, 52, 51, 50
tooth chain rings? I'm fine tuning a derailleur fit. I'd like to get the tail of the derailleur dropped a couple of mm to keep the chain from dragging one rear cog smaller than it does now (currently 53 on the front). -Jim ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
Chain Ring Diameters
James Fitch wrote:
Does anyone know, offhand, what the outside diameters are of 53, 52, 51, 50 tooth chain rings? I'm fine tuning a derailleur fit. I'd like to get the tail of the derailleur dropped a couple of mm to keep the chain from dragging one rear cog smaller than it does now (currently 53 on the front). -Jim Each tooth is a half-inch. Diameter = circumference / pi. Dan |
Chain Ring Diameters
On Mar 6, 12:49 pm, Dan Connelly
wrote: James Fitch wrote: Does anyone know, offhand, what the outside diameters are of 53, 52, 51, 50 tooth chain rings? I'm fine tuning a derailleur fit. I'd like to get the tail of the derailleur dropped a couple of mm to keep the chain from dragging one rear cog smaller than it does now (currently 53 on the front). -Jim Each tooth is a half-inch. Diameter = circumference / pi. Dan Plus a skosh for the points of the teeth. The formula you posted describes the diameter through the pins of the chain- the chainrings' actual diameter is a little larger than that. In my experience, fine-tuning front derailleur fit is best done once the bike is completely assembled. If you need a front derailleur with a longer cage, maybe you should indicate what kind of frame and front derailleur you have currently. Jeff |
Chain Ring Diameters
"JeffWills" wrote in message oups.com... On Mar 6, 12:49 pm, Dan Connelly wrote: James Fitch wrote: Does anyone know, offhand, what the outside diameters are of 53, 52, 51, 50 tooth chain rings? I'm fine tuning a derailleur fit. I'd like to get the tail of the derailleur dropped a couple of mm to keep the chain from dragging one rear cog smaller than it does now (currently 53 on the front). -Jim Each tooth is a half-inch. Diameter = circumference / pi. Dan Plus a skosh for the points of the teeth. The formula you posted describes the diameter through the pins of the chain- the chainrings' actual diameter is a little larger than that. In my experience, fine-tuning front derailleur fit is best done once the bike is completely assembled. If you need a front derailleur with a longer cage, maybe you should indicate what kind of frame and front derailleur you have currently. Jeff Its on a long-assembled bike with a Campy triple front derailleur. I recently put on a smaller inner chain ring, which caused the dragging when on the 5th cog. I'd like the lower gears more than the higher ones, so the simplest solution seemed to be to simply put on a smaller large chain ring and lower the derailleur. A longer derailleur cage would work, too. Dan's formula (and I'm a little irked I didn't think of it myself) is probably accurate enough to tell me what I need to know. -Jim ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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