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Could I get a better explanation? 'Prevents granny gear fromovershifting'
I was popping around looking at some different sites and I found this
thing: 3rd Eye Chain Watcher * 3rd Eye Chain Watcher Chain Deflector * Prevents granny gear from overshifting * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk |
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#2
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Could I get a better explanation? 'Prevents granny gear fromovershifting'
On Apr 16, 6:42*pm, TBerk wrote:
I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * * * 3rd Eye Chain Watcher Chain Deflector * * * Prevents granny gear from overshifting * * * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk It keeps the chain form falling off the smallest chainring in toward the frame. This can happen occasionally, and can result in a jammed chain and/or dirty fingers. It's sort of an insurance policy. Joseph |
#3
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Could I get a better explanation? 'Prevents granny gear from overshifting'
"TBerk" wrote in message ... I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * 3rd Eye Chain Watcher Chain Deflector * Prevents granny gear from overshifting * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk This and several other similar devices are designed to keep the chain from falling off of the small inner chainring when down shifting or bouncing on rough surfaces. They can help prevent "chain suck" where the chain gets caught between the crank and chainstays or bottom bracket. Chas. |
#4
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Could I get a better explanation? 'Prevents granny gear fromovershifting'
TBerk wrote:
I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * 3rd Eye Chain Watcher Chain Deflector * Prevents granny gear from overshifting * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk Often the chain will fall off when shifting to the granny gear if the front dérailleur isn't precisely adjusted (as well as depending on which rear sprocket the chain is on. It's usually a big drop from the middle front chainwheel to the granny gear, and the Chain Watcher helps guide the chain onto the granny gear. I've had one for years on my touring bicycle. |
#5
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Could I get a better explanation? 'Prevents granny gear from overshifting'
On Wed, 16 Apr 2008 09:42:03 -0700 (PDT), TBerk
wrote: I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * 3rd Eye Chain Watcher Chain Deflector * Prevents granny gear from overshifting * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk Dear Berk, You clamp the chain watcher around your seat post and then turn it until the small curved plastic arm nearly touches your smallest front sprocket, just below the chain. http://i26.tinypic.com/15p63is.jpg If the chain falls off the smallest front sprocket, it just hangs on the plastic arm instead of falling down to the bottom bracket. You can just shift and get the chain back onto the sprocket. Most bikes at Paris-Roubaix used chain-watchers because bouncing over cobblestones at speed can bounce chains off. Cheers, Carl Fogel |
#6
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Could I get a better explanation? 'Prevents granny gear fromovershifting'
On Apr 16, 7:18*pm, wrote:
On Wed, 16 Apr 2008 09:42:03 -0700 (PDT), TBerk wrote: I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * ** 3rd Eye Chain Watcher Chain Deflector * ** Prevents granny gear from overshifting * ** Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk Dear Berk, You clamp the chain watcher around your seat post and then turn it until the small curved plastic arm nearly touches your smallest front sprocket, just below the chain. *http://i26.tinypic.com/15p63is.jpg If the chain falls off the smallest front sprocket, it just hangs on the plastic arm instead of falling down to the bottom bracket. You can just shift and get the chain back onto the sprocket. Most bikes at Paris-Roubaix used chain-watchers because bouncing over cobblestones at speed can bounce chains off. Cheers, Carl Fogel If you mount it a little higher, such that is almost rubs the side of the chain when it is on the small ring, the chain won't even fall off enough to hang on the plastic. It will just stay on through all sorts of abuse. I haven't ridden much pave, though... Joseph |
#7
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Could I get a better explanation? 'Prevents granny gear from overshifting'
In article ,
"* * Chas" wrote: "TBerk" wrote in message ... I was popping around looking at some different sites and I found this thing: 3rd Eye Chain Watcher * 3rd Eye Chain Watcher Chain Deflector * Prevents granny gear from overshifting * Fits 1-1/8" to 1-3/8" round or oval seat tubes What exactly is overshifting? (I'm going to make sure my guesses of what the granny gear is on my own.) What does this thing do, if anything? Thx in advance, TBerk This and several other similar devices are designed to keep the chain from falling off of the small inner chainring when down shifting or bouncing on rough surfaces. They can help prevent "chain suck" where the chain gets caught between the crank and chainstays or bottom bracket. I suppose they could help with chain suck, but that's usually defined as what happens when the chain fails to disengage from the ring(s) at the bottom of the ring and there's a separate device for preventing it: http://www.bikepro.com/products/chai...nretainer.html Behold the Ringle Anti Chain Suck Thing. The difference is simple to remember: chain drop = cranks spin freely = bike stops, rider falls down chain suck = cranks lock = bike stops, rider falls down So basically, if your crotch hits the seat or top tube, it's chain drop, while if your crotch hits the back of the stem, it's chain suck. Chain suck is fairly rare outside of mountain biking circles but chain drop appears in more circumstance. A chain watcher is a reasonable device for any rider on rough roads, though I'd be reluctant to call it necessary. I purely forgot to put my old chain watcher on my new CX bike last year, and I think I actually did drop my chain off the small ring (compact double setup; letters from purists to the usual address) once or twice during races. Cyclocross bikes are somewhat prone to chain drop during dismounts, remounts, and just as a result of rough and mucky terrain. -- Ryan Cousineau http://www.wiredcola.com/ "In other newsgroups, they killfile trolls." "In rec.bicycles.racing, we coach them." |
#8
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Could I get a better explanation? 'Prevents granny gear fromovershifting'
Ryan Cousineau wrote:
[...] Behold the Ringle Anti Chain Suck Thing. The difference is simple to remember: chain drop = cranks spin freely = bike stops, rider falls down chain suck = cranks lock = bike stops, rider falls down [...] Or cranks lock, rider stays on bicycle, chain is yanked hard against chain stay resulting in a nasty gouge. {Been there, done that} -- Tom Sherman - Holstein-Friesland Bovinia The weather is here, wish you were beautiful |
#9
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Could I get a better explanation? 'Prevents granny gear fromovershifting'
On Apr 16, 9:42 am, TBerk wrote:
snip Thx in advance,TBerk And Thx to all. Real life experience triumphs again! TBerk |
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