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Old 12-04-08, 12:17 PM   #1
silentben
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How many teeth?

No I'm not talking about BenRidin's avatar

I was cleaning my drivetrain yesterday when I wondered exactly how many teeth are on all my chainrings and cogs. It turns out the answer is 261.

Front: 86 (36-50)
Rear: 175 (12-13-14-15-16-17-19-21-23-25)
Total: 261

I suppose you could also add 20 more for the two wheels in the rear derailleur for a total of 281 but that's kind of a constant on derailleur geared bikes (unless some derailleurs don't use 10 tooth wheels?)

One thing I found interesting is that I was considering putting an 11 cog on my cassette. This would actually lose me 5 teeth because I'd change out the 12-13-14-15-16 gears for 11-12-13-14-15.

The other thing is that tall gearing in the front increases your tooth count but so does granny gearing in the rear so there's no real direct correlation between number of teeth and gear ratio ranges. Of course fixies and single speeds are a whole other ball of wax. And unicycles and high wheel bikes are yet another

Not sure what this info is useful for but it made me wonder what gearing other people are using and how many teeth they have.
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Old 12-04-08, 12:19 PM   #2
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I got all but a few shattered molars...no jk, jk
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Old 12-04-08, 12:27 PM   #3
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Quote:
Originally Posted by silentben View Post
No I'm not talking about BenRidin's avatar

I was cleaning my drivetrain yesterday when I wondered exactly how many teeth are on all my chainrings and cogs. It turns out the answer is 261.
You forgot to include the teeth in your RD's jocky cage.
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Old 12-04-08, 12:45 PM   #4
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All this time I thought you had a 34t inner ring. I tried using a 36t inner ring on a few rides. Most recently the slugfest that went up Redwood Gulch, BOB, Montebello then the steep stuff by Alpine. A low of 36x25 was simply too tough and I was zig zagging up everything and generally ruined by the time we got to Robert's Market in Woodside.

50x11 is great for Skyline, West 84 and the bottom section of Hamilton on the way back.
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Old 12-04-08, 12:53 PM   #5
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Originally Posted by silentben View Post
I suppose you could also add 20 more for the two wheels in the rear derailleur for a total of 281 but that's kind of a constant on derailleur geared bikes (unless some derailleurs don't use 10 tooth wheels?)
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You forgot to include the teeth in your RD's jocky cage.
You forgot to read the next paragraph of my post
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Old 12-04-08, 01:03 PM   #6
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All this time I thought you had a 34t inner ring. I tried using a 36t inner ring on a few rides. Most recently the slugfest that went up Redwood Gulch, BOB, Montebello then the steep stuff by Alpine. A low of 36x25 was simply too tough and I was zig zagging up everything and generally ruined by the time we got to Robert's Market in Woodside.

50x11 is great for Skyline, West 84 and the bottom section of Hamilton on the way back.
Well I have done my share of both zigzagging and being ruined. Maybe with a 50-11 combo I could hang with Marco and Ruth on West 84
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Old 12-04-08, 02:50 PM   #7
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Maybe with a 50-11 combo I could hang with Marco and Ruth on West 84
So long as you don't lose the draft.... and pedal through every corner (except maybe 1 or 2)

EDIT:

The tandem has a lot of teeth
Chainrings (53/42/30) = 125
Cassette (11,12,14,16,18,21,24,28,32) = 176
Timing Rings (34 x 2) = 68

Total = 369 (301 without timing gears)

Last edited by uspspro; 12-04-08 at 02:58 PM.
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Old 12-04-08, 03:55 PM   #8
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Quote:
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You forgot to read the next paragraph of my post
D'oh!!!
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Old 12-04-08, 07:30 PM   #9
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Originally Posted by uspspro View Post
So long as you don't lose the draft.... and pedal through every corner (except maybe 1 or 2)

EDIT:

The tandem has a lot of teeth
Chainrings (53/42/30) = 125
Cassette (11,12,14,16,18,21,24,28,32) = 176
Timing Rings (34 x 2) = 68

Total = 369 (301 without timing gears)
We run the same gears -- thanks for doing the math!

You didn't count the cogs on the left side, did you?
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Old 12-04-08, 11:02 PM   #10
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Total = 369 (301 without timing gears)
That's almost twice as much as three of my bikes combined! (IRO: 47x16, Motobecane: 38x14, Downtube: 48x23, total of 186.)

Of course, the Surly has lots. 290 total with a standard double (53, 39), that massive cassette (11, 12, 14, 16, 18, 21, 24, 28, 32), and a mountain rear derailleur (11, 11).

So that's 476 teeth altogether, or 599 if you count the extra cog, freewheel, and pair of chainrings I have hanging around.
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Old 12-04-08, 11:53 PM   #11
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If I take my total tooth count, subtract the change in my pocket, add in my street address minus my IQ and multiply by the number of flats I get per year I end up with information equally insightful. But I find I still need to change my chain more often than I can afford.
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Old 12-05-08, 01:51 AM   #12
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if i take my total tooth count, subtract the change in my pocket, add in my street address minus my iq and multiply by the number of flats i get per year i end up with...
42?
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Old 12-06-08, 08:02 PM   #13
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Quote:
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All this time I thought you had a 34t inner ring.
You're right. I actually looked at it today (i know, crazy idea) and it is a 34. When I made the original post I was just going from the specs on cannondale's web site.
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