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Sweet 16t

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Sweet 16t

Old 10-14-01, 07:25 AM
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Sweet 16t

I love my 16t cog. I can cruise in that gear [53x16] at 100 rpm for hours. It is the perfect cog for that comfortable 30 km/h cruise. I love my sweet 16t.

But what's this? I pop the cassette from my GF's Shimano 105-equipped bike; I count the cog teeth... 12... 13... 14... 15... 17... Waitaminnit! There's no 16! How could Shimano put together a cassette with no 16t cog? That's just dumb!
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Old 10-14-01, 06:24 PM
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Wups! Actually, it seems like surprisingly few cassettes come with the 16 or 18. Just order her one that does. Sheldon Brown lists all the available Shimano cassettes and the exact cogs each has. Bicycling Magazine had a little blurb about the beauty of the 16 a few months ago. Hope one day I can pedal a 53/16 at 100 for ANY length of time. Well, I CAN do it now. For a mile or so. With a tailwind.
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Old 10-14-01, 07:35 PM
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Maybe it's a Campy thing...

Seems she'll have to give up her 12 [no big deal, since 39x12 is impossible in Shimano, and 53x12 is too big for her], but the chainline would deprive her of her 39x13... have to think about that.
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Old 10-14-01, 07:41 PM
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And that should have been 39x16... I can DO 53x16 @ 100 rpm for quite a while in a paceline, and I can sprint at 53x14 for 400 metres... but then I'm cooked... REALLY cooked... [I'm reverse-calculating this, thinking that I can ride @42 km/h in a paceline in 53x16 for quite a while, so I MUST be doing 100 rpm].
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Old 10-14-01, 09:14 PM
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V - I'm with you on the 16t thing. My fixed gear bike is great on 52 x 16. Ok, a little slow getting started, but it's a locomotive once I get the steam up. I don't always concentrate on gears on my race bike, but I notice that I'm in 16 when I'm done.
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Old 10-15-01, 02:11 AM
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You're right I've got a sweet gear too - I'll have to pop outside and count the teeth. Shimano - any bets what combination it is?

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Old 10-15-01, 02:53 AM
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Well I've just been out for a count - my cassete is:
11
12
14
16
18
21
24
It's Shimano. Front rings are 48 and 52

My most common combo is the 14t with the 48 that has me comfortable at 30kph.

Does anyone have a calculator or web site that can compute cadence??

What I really love about those gears is that on touch of the lever puts me on the big 52 ring if I want to get a hurry on.

Stew
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Old 10-15-01, 06:12 AM
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FWIW, you can make your own custom cassette. On most cassettes, there are long rivets which hold the cogs (and spacers) together. Drill them out, and add a organize them and a few loose cogs into the setup you really like!
Just remember that Hyperglide (as well as newer campy cogs) are uni-directional! They only work 1 way.
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Old 10-15-01, 08:11 AM
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Try this one: https://www.panix.com/~jbarrm/cycal/cycal.30f.html

I have used all of my synapses for today, but think that their "pedal rotations per mile" can be worked easily into cadence.

And this one actually outputs cadence: https://www.soulbikes.com/gears/

Cheers...Gary
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Old 10-15-01, 09:06 AM
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gary thos calculations are great.
Give or take some for margin of error they figure I'm doing about 80rpm when I'm cruising at 30kph.

so I can afford to pedal a bit quicker as well as delay my shift up to the big ring.
I might also consider a new cassette
the 24t is useful on big hills but I'm definitely spending more time down the ther end. so maybe go down to 10 on smallest and increase the gaps at the big end eg:
10
11
12
14
16
20
24

Stew
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Old 10-15-01, 09:25 AM
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Originally posted by stewartp


Does anyone have a calculator or web site that can compute cadence??

Stew

b/c you asked.... I wrote a quick calculator for speed and candence on my website (jordin.net
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Old 10-15-01, 10:51 AM
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Does anybody actually make a 10 tooth cog? I've never seen one!
I had a 7 cog cassette once that had an 11 tooth. I used it maybe twice, and ended up replacing the 11 tooth with a 12. About all an 11 tooth is good for is for riding down hills faster than gravity will take you. A 10 tooth is probably only good for riding down hills with a tail wind.
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Old 10-15-01, 11:28 AM
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Originally posted by D*Alex
FWIW, you can make your own custom cassette. On most cassettes, there are long rivets which hold the cogs (and spacers) together. Drill them out, and add a organize them and a few loose cogs into the setup you really like!
Just remember that Hyperglide (as well as newer campy cogs) are uni-directional! They only work 1 way.
Some cassettes have rivets. Some, including the 9-speed Shimano HG70 (105) cassettes I use, have tiny hex screws that use a 1.5 mm hex wrench. They are so tiny, they look like rivets, but see if a 1.5 will fit before you start drilling. I haven't used any Ultegra or DA cassettes that have cogs on a "spider" so I don't know about how those are attached or if they can be disassembled.

I seldom use a stock cassette. I like to assemble a cassette that has a 21T as my 3rd largest cog so it is usable with the 52 up front when needed. Then 19 on down in 1-tooth increments such as
25 or 26 or 27
23
21
19
18
17
16
15
14 or 13
I really don't need anything smaller than a 14 because I can't drive anything that big with the 52 yet anyway.

Keeping Shimano HG cogs properly oriented is pretty straightforward. Each cog has the the number of teeth stamped at the large "lug". The cog will only fit with the large "lug" in the large space on the splined freehub, and the tooth stamp should be facing you.

Assembling a cassette with exactly the gearing you want is easy and fun. You can buy one that is close and then buy the extra cogs you want. Sometimes it is cheaper just to buy two cassettes and combine what you need. Hyperglide cogs are specific to their location. In other words, a 16T that is designed to go between a 14 and an 18 has a slightly different tooth configuration than a 16 designed to go between a 15 and a 17. The differences are small, and one could almost certainly use either 16 in either case and it would work. However, shifting mght not be quite as smooth.

Sheldon Brown's article on cassettes and freehubs discusses 11T cogs in such a way that I get the impression that even the 11 is near the limit of the materials because so little material is available on a cog that small. I would guess that a 10 would really be pushing it. Maybe that is why pros go the other way, using 54-55-56T chainrings for time trials to get higher ratios.

Regards,
Raymond
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Old 10-15-01, 01:54 PM
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11 tooth cogs which are used a lot (probably mostly in the smaller rings) wear at an alarmingly fast rate. I would bet sure money that a 10 tooth cog would wear even faster, and since there would be extremely little metal around the threads, would be prone to breakage.
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Old 10-15-01, 03:47 PM
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Originally posted by D*Alex
Does anybody actually make a 10 tooth cog? I've never seen one!
I suspect you're right Alex - I was looking at Campag Chorus stuff and 11 was their smallest.

Stew
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