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Chainrings and cogs number
Hello,
I am restoring a bike with a badly worn transmission, so I will change both chain, cogs and chainrings. It has a freehub with 8 cogs, and 3 chainrings. Since these chainrings are replaceable, I prefer to buy them separately rather than buying an entire crankset. I am not fond of dumping hardware for no reason, in this case the existing cranks. I see that chainrings are labelled for a number of cogs, e.g. 7/8, 9 or more. I assume that this is because, when you have a large number of cogs, you need a thin chain so it does not touch the next cog, and thin chainrings to fit into the chain links. If this is so, using a chainring designated for 9 cogs would not be a real issue on my bike that has 8 cogs and a chain for 8 cogs as well, would it? -- Tanguy |
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#2
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Chainrings and cogs number
On 9/1/2020 5:33 AM, Tanguy Ortolo wrote:
Hello, I am restoring a bike with a badly worn transmission, so I will change both chain, cogs and chainrings. It has a freehub with 8 cogs, and 3 chainrings. Since these chainrings are replaceable, I prefer to buy them separately rather than buying an entire crankset. I am not fond of dumping hardware for no reason, in this case the existing cranks. I see that chainrings are labelled for a number of cogs, e.g. 7/8, 9 or more. I assume that this is because, when you have a large number of cogs, you need a thin chain so it does not touch the next cog, and thin chainrings to fit into the chain links. If this is so, using a chainring designated for 9 cogs would not be a real issue on my bike that has 8 cogs and a chain for 8 cogs as well, would it? No problem at all. Campagnolo techs told us clearly that the Ten and 1st-gen Eleven rings are identical parts until labeled. (the crank web is smaller on 11). You'll run into problems running a skinny chain on a 5/6 speed crank as the chain can jam between chainrings. A fat chain on a modern crank will drag the outer when in low chainring more annoyingly than the correct chain. Generally use the widest compatible chain. For an 8 cassette with 9 or Ten rings, use the Eight chain. Where there's a big discrepancy (12 speed crank with a five speed system) expect difficulties but 1 or 2 formats' difference is negligible for chainrings. Also any derailleur chain will engage any chainring's teeth so on a single front ring system this doesn't matter at all. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#3
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Chainrings and cogs number
AMuzi, 2020-09-01 14:48+0200:
On 9/1/2020 5:33 AM, Tanguy Ortolo wrote: If this is so, using a chainring designated for 9 cogs would not be a real issue on my bike that has 8 cogs and a chain for 8 cogs as well, would it? No problem at all. Campagnolo techs told us clearly that the Ten and 1st-gen Eleven rings are identical parts until labeled. (the crank web is smaller on 11). Thank you for confirming my intuition. By the way, the reason I am asking is because it is sometimes easier to find the chainrings I want for 9 speeds than for 8 speeds. I now have to work out a relevant selection of cogs and chainrings, that would provide regularly spaced ratios. -- Tanguy |
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Chainrings and cogs number
On Tuesday, September 1, 2020 at 8:24:31 AM UTC-7, Tanguy Ortolo wrote:
AMuzi, 2020-09-01 14:48+0200: On 9/1/2020 5:33 AM, Tanguy Ortolo wrote: If this is so, using a chainring designated for 9 cogs would not be a real issue on my bike that has 8 cogs and a chain for 8 cogs as well, would it? No problem at all. Campagnolo techs told us clearly that the Ten and 1st-gen Eleven rings are identical parts until labeled. (the crank web is smaller on 11). Thank you for confirming my intuition. By the way, the reason I am asking is because it is sometimes easier to find the chainrings I want for 9 speeds than for 8 speeds. I now have to work out a relevant selection of cogs and chainrings, that would provide regularly spaced ratios. -- Tanguy If you're not jumping right in let me go through the cogsets I have to see if I have either an 8 or 9. I'd give it to you for postage. |
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Chainrings and cogs number
Tom Kunich, 2020-09-02 01:03+0200:
On Tuesday, September 1, 2020 at 8:24:31 AM UTC-7, Tanguy Ortolo wrote: I now have to work out a relevant selection of cogs and chainrings, that would provide regularly spaced ratios. If you're not jumping right in let me go through the cogsets I have to see if I have either an 8 or 9. I'd give it to you for postage. I am not at all in a hurry indeed, since this is one of the bikes I am setting up at my parent's holiday home, and I am not there at the moment. -- Tanguy |
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Chainrings and cogs number
On Wednesday, September 2, 2020 at 12:40:18 AM UTC-7, Tanguy Ortolo wrote:
Tom Kunich, 2020-09-02 01:03+0200: On Tuesday, September 1, 2020 at 8:24:31 AM UTC-7, Tanguy Ortolo wrote: I now have to work out a relevant selection of cogs and chainrings, that would provide regularly spaced ratios. If you're not jumping right in let me go through the cogsets I have to see if I have either an 8 or 9. I'd give it to you for postage. I am not at all in a hurry indeed, since this is one of the bikes I am setting up at my parent's holiday home, and I am not there at the moment. -- Tanguy I'll try to go through them today. |
#7
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Chainrings and cogs number
On Wednesday, September 2, 2020 at 9:17:40 AM UTC-7, Tom Kunich wrote:
On Wednesday, September 2, 2020 at 12:40:18 AM UTC-7, Tanguy Ortolo wrote: Tom Kunich, 2020-09-02 01:03+0200: On Tuesday, September 1, 2020 at 8:24:31 AM UTC-7, Tanguy Ortolo wrote: I now have to work out a relevant selection of cogs and chainrings, that would provide regularly spaced ratios. If you're not jumping right in let me go through the cogsets I have to see if I have either an 8 or 9. I'd give it to you for postage. I am not at all in a hurry indeed, since this is one of the bikes I am setting up at my parent's holiday home, and I am not there at the moment. -- Tanguy I'll try to go through them today. I have four or five 9-speed Campy 9 speed cogsets, but after looking up the mailing costs, you would be better buying them there. |
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Chainrings and cogs number
Tom Kunich, 2020-09-02 22:38+0200:
I have four or five 9-speed Campy 9 speed cogsets, but after looking up the mailing costs, you would be better buying them there. No problem, since I just need a basic cassette, buying a new one is not really that expensive. :-) Thanks for looking. -- Tanguy |
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