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  1. #1
    mtbr member
    Join Date
    Nov 2015

    2014 SC Tallboy C 2x10 conversion to either 1x10 or 1x11

    I own a 2014 SC Tallboy C with XT-R components. The bike came with the following chain set components:
    Cassette - Shimano CS-HG81-10 11T (36/32/28/24/21/19/17/15/13/11)
    Chainring - Shimano M785 HG-X (38/26) Bolt circle 104mm
    Chain - Shimano CN-HG75
    Crankset - Shimano FC-M785
    Derailleurs - Shimano FD-M786-D and RD-M786-D

    I use this bike normally on all mountain/cross country type of trails. No downhill because I live in Florida. I normally use the 38 chainring and the five largest cogs in the back, with the 36, 32 and 28 used most. I never use the five smaller cogs on my cassette. I find a lot of times I need about 2 or 3 more lower gears to go up steep climbs so I have decided to convert my set to a 1x10 or 1x11 using a smaller chainring.

    The question is what size should I get for my chainring if I should keep my cassette as it is now. I have read a lot of people using a 30 or 32 on this type of trails. I was also thinking about putting a 42 cog in the back and remove one in the middle, but I am not sure if I can do that conversion with my cassette, I guess I will have to research. Any input/feedback/comments will be appreciated.2014 SC Tallboy C 2x10 conversion to either 1x10 or 1x11-sc.jpg

  2. #2
    mtbr member
    Reputation: J.B. Weld's Avatar
    Join Date
    Aug 2012
    You are misusing your current gears by unnecessarily cross chaining it (excessive chain angle) which causes premature drivetrain wear. You could be in the 26/19 combo instead of a 38/28 (same gear) running a nearly straight chain.

    That said you seem a perfect candidate for 1x. Based on the highest gears you're using now and your desire for a few lower ones I'd recommend a 30t n/w chainring for the 64 bcd (inside) position. That would keep you mostly in the middle of the cassette with reserve on the high & low end, and also give you the straightest chainline.

  3. #3
    mtbr member
    Join Date
    Nov 2015
    Thanks a lot JB. The reason I use my bigger chainring is because when I am on the 26 ring the 38 is exposed and I already spiked my calf with it, so I want to avoid another bodily injury. That is another one of the reasons I want to do the 1x10, so that doesn't happen again. I think I am going to start off with your advice, 30t on the middle inside position and leave my cassette as it is. I'll probably get a used one in case I feel I need to go higher, I don't spend money in vain.

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