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Old 03-22-13, 12:35 PM   #1
thehammerdog
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New 2x10 set up

I was reading the new dirtrag and saw that almost every bike was a single up front times 10 in back?
What memo did I miss and why is this the rage?
I have an old school 3x9.......so help a brotha out.
The idea of a single front chainring is cools I guess but whats the magic tooth number needed?

I would like some insight as to when this too place.....
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Old 03-22-13, 12:54 PM   #2
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I believe most 2x10 setups have a 39t outer chainring. I imagine if you did a 1x10 setup with a 32t front chainring, and a standard MTB 10 speed cassete you would a good gear range. The magic tooth number is whatever you will be comfortable with on steep climbs and adrenaline inducing downies!
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Old 03-22-13, 03:27 PM   #3
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The terrain and the strength of the rider is what determines what you really need for rings. I still like the variety my 3X9 offers. A 2X9 can give you a wide spread and can probably stretch as far as a 3X9. A tad less weight and less shifting would be my guess for the 2X9. Since I ride pavement to get to my trails, I like the 3X9 setup. A 1X9 can save you TAD X's 2 if you get the range that you like.
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Old 03-22-13, 06:20 PM   #4
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for me 32t with an 11-36
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Old 03-22-13, 06:32 PM   #5
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I'm debating on swapping my HiFi to a 2x10 setup. Possibly a 38/24.
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Old 03-23-13, 06:53 AM   #6
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I ride 32t up front with 11-34 9spd cassette but it's a 29er with tall tires. Just keep an eye on the highest and lowest gear you use regularly on your current setup, then muck about in a gear calculator to find the best matching setup for that range.
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Old 03-27-13, 02:30 PM   #7
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I have a 26" bike with 2x10- 28/39 rings and 11-36 cassette. In Kansas, I can actually ride most trails entirely in the big ring. But I would hate a 32T single because I run out of gear pretty quickly on any sustained downhill section, which is especially annoying if you're out with buddies on a gravel road ride. (I can bring my CX bike instead, but it beats me up on washboard roads.) 28x36 is more than adequate even on the steepest stuff I can do-- I'm no trials rider, so it's better for me to walk when it gets ultra slow and techy.

If you have a 29er I would suggest using no bigger than 38T. I would also caution you to be sure your rear derailleur has enough capacity to use a 11-36 or 12-36 cassette with the 2x10 crankset you choose. That's how I ended up with a 28T small ring-- my SRAM x9 type 2 midcage can't handle the 11-36 cassette otherwise.
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Old 03-29-13, 06:52 AM   #8
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I dropped the 39 tooth off the cranks and just run the 26 tooth in a 1X10. ditching the fr derailuer, shifter,cable and housing lost almost a pound off the bike. plenty of gearing for my trails. gravel rides leave me spinning my ass off though.
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Old 03-29-13, 09:55 AM   #9
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My bike weighs 24.5 pounds ready to ride. So, I'm pretty happy about being able to pedal faster than 13 mph.
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