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40-42 teeth rear

Old 12-03-13, 02:57 AM
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kjmillig
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40-42 teeth rear

I've just learned about 42 teeth rear cogs and read a short article about 1x10, 1x11, and 2x10 setups. What I want to know is can a 3x10 setup work? Is it just overkill? My thoughts are of loaded touring or loaded utility riding with hills. BTW, I cannot climb, hence my curiosity.
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Old 12-03-13, 08:33 AM
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Originally Posted by kjmillig View Post
I've just learned about 42 teeth rear cogs and read a short article about 1x10, 1x11, and 2x10 setups. What I want to know is can a 3x10 setup work? Is it just overkill? My thoughts are of loaded touring or loaded utility riding with hills. BTW, I cannot climb, hence my curiosity.
Overkill if you're running typical mtn chainrings up front (22/24/26t small ring); maybe not if you're running a road touring triple (30t small ring).

Keep in mind that you're basically running a kludge -- no one makes a standard 11-42 10sp cassette, so you're building it off a stock Shimano/SRAM cass plus aftermarket solution. The SRAM 10-42 11sp cassette/derailleur only works with their 1x11 system (that I know of).
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Old 12-03-13, 08:40 AM
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You also have to be careful of chain wrap capacity. You might have problems combining a wide range triple with a wide range cassette.

What crankset and chainrings are you using now?
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Old 12-03-13, 09:21 AM
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Originally Posted by kjmillig View Post
I've just learned about 42 teeth rear cogs and read a short article about 1x10, 1x11, and 2x10 setups. What I want to know is can a 3x10 setup work? Is it just overkill? My thoughts are of loaded touring or loaded utility riding with hills. BTW, I cannot climb, hence my curiosity.
Only you can decide if that kind of gear is overkill. You'll get lots of responses along the lines of "you don't need anything lower than an X tooth chain wheel with a Y toothed rear cog" (substitute your favorite knee killing numbers for X and Y) but it's your knees and legs that have to power the bike up hills. I'm of the mind that you get the lowest gears you can possible get as long as the set up isn't impossible.

That said, a 20(front)/42(rear) combination offers some challenges with equipment. Adding a larger ring, like a 44 or a 48, to the front would make the challenge even worse. Derailers may, or may not, be able to handle that kind of range. A 48/36/20 crank with a 11-34 cassette is within the comfort zone for most mountain bike derailers. You can get a 36 or 38 tooth cog on Fleabay which would still be in the range of the derailer. You'd replace the 34 with either the 36 or 38 and just live with a larger step to the low gear.

The other problem with the 11 speed cassettes is how you shift them. Sram's XX derailer doesn't work with road shifters, so you'd have to go with a flat bar. Most of the Shimano mountain bike components don't work with road shifters either. You'd need a new drivetrain which can get pricey.
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Old 12-03-13, 09:52 AM
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Originally Posted by cyccommute View Post
Most of the Shimano mountain bike components don't work with road shifters either.
Key to Shimano rd/mtn is using a 9sp mtn derailleur with 10sp road shifters. No idea regarding the new 11sp stuff, though...
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Old 12-03-13, 09:54 AM
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that SRAM 10-42t cassette itself costs about the same as a Trek 850, the whole bike.
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Old 12-03-13, 10:47 AM
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How slow can you go? At some point your climbing speed will be so slow that you'll likely have trouble staying balanced. I'm thinking that 20/42 will approach that point.
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Old 12-03-13, 10:50 AM
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Originally Posted by mconlonx View Post
Key to Shimano rd/mtn is using a 9sp mtn derailleur with 10sp road shifters. No idea regarding the new 11sp stuff, though...
I should have said Dynasys doesn't work with road shifters. 9 speed mountain derailers are probably on their way out. They are already gone in the upper end of the mountain bike line. You can get them in Deore and Alivio but I suspect those will be gone soon too.
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Old 12-03-13, 10:56 AM
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Originally Posted by Retro Grouch View Post
How slow can you go? At some point your climbing speed will be so slow that you'll likely have trouble staying balanced. I'm thinking that 20/42 will approach that point.
With a little practice, anyone can go 0 mph... as in a track stand. A 20/42 gear at 40 rpm with a 27" wheel has a speed of 1.5mph. 60 rpm returns a speed of 2.3mph. I've done lots of climbing at 3 mph off-road where balance is much more difficult. It's not all that to travel at that speed on pavement.
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Old 12-03-13, 11:09 AM
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And I don't get why that decision was made. Was it purely a profit thing or is there some hidden mechanical reasoning for it?
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Old 12-03-13, 11:57 AM
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For a touring setup you might think about doing a 3x9 using Shimano's 12-36 cassette and a 20-30-42 triple crankset. A 20-36 combo is pretty nice, especially since what you're trying to achieve with the 11-speed 42 cog stuff isn't workable yet, and quality nine speed components are easy to come by, plus a long cage rear derailleur will shift everything just fine. I've built several 'touring/can't climb' bikes with such a drivetrain and from experience can say it'll likely meets your needs.
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Old 12-03-13, 12:02 PM
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"speeds" says nothing about the gear ratio, to get the ratio you count teeth,

not how many cogs there are ..
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Old 12-03-13, 12:22 PM
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Originally Posted by cyccommute View Post
With a little practice, anyone can go 0 mph... as in a track stand. A 20/42 gear at 40 rpm with a 27" wheel has a speed of 1.5mph. 60 rpm returns a speed of 2.3mph. I've done lots of climbing at 3 mph off-road where balance is much more difficult. It's not all that to travel at that speed on pavement.
I'm sure that your experience fits some other riders. I'm equally sure it won't fit some others. Just giving the OP something else to think through.
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Old 12-03-13, 12:25 PM
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Originally Posted by kjmillig View Post
My thoughts are of loaded touring or loaded utility riding with hills. BTW, I cannot climb, hence my curiosity.
You need to be careful saying things like this, because they are self-fulfilling prophecies.

I have no objection to people getting the lowest gears they can, but I think a positive attitude and a willingness to work on climbing are important, too. Dreading the climb makes it worse when you get there, enjoying the challenge makes it that much more worth doing.
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Old 12-03-13, 12:55 PM
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Saw this on another bike forum. It uses the General Lee 29-35-42 with a Shimano 11-36 cassette.

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Old 12-03-13, 01:19 PM
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One of this days a company will come with the idea that a chainwheel of 10T and a cog of 60T is the way to go to the moon and that will be the next gear combination in vogue. 42... !
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