155mm fat bike crankset?- Mtbr.com
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  1. #1
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    155mm fat bike crankset?

    Hi, I'm looking to put some shorter cranks on my 9 year old's 24" fat bike. It's a Reid Titan, 100mm BB, 170mm rear.

    Do you all know of any options for fat bike cranksets this short? Pretty much everything readily available is either 170mm or 175mm, though Hope offers a 165mm set which is very pricey.

    Right now the bike has a cheap and heavy square taper bottom bracket with 170mm arms and a triple. I'd like to lighten the bike and convert it to a 155mm length for a 1x setup with a narrow wide ring.

    I've been looking for 155mm square taper arms, and the only ones I can find are BMX cranks or trials cranks.

    The BMX cranks have a 5 point 110BCD spider, which means the only narrow wide options are 36 teeth and up.

    The trials cranks use a threaded freewheel or fixed cog, which is not narrow wide and would likely have dropping issues on a 1x, unless I use a retainer which I'd prefer not to.

    Any other ideas?

  2. #2
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    They don't exist, because no one's asking for them.

    You could find a set of ~180mm cranks and take them to a machine shop to be shortened and re-drilled.

  3. #3
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    Short Bicycle Cranks

    Take a look at what he can make, he has some in stock.

    I'd go shorter, maybe 145-150mm, better too short than too long.

    I ride muni, I'm used to short cranks, have ran as short as 75mm. Short cranks turn over faster requiring less leg motion, so they are more efficient. Short cranks are better for folks who have less mass.

    I ride 150mm on all my munis, 170mm on bikes, but my plan is to reduce to 165mm on bikes and if a quality direct mount crank is made in 160mm I'll get em.

    Don't be afraid of short cranks!

  4. #4
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    Quote Originally Posted by Nurse Ben View Post
    Short Bicycle Cranks

    Take a look at what he can make, he has some in stock.

    I'd go shorter, maybe 145-150mm, better too short than too long.

    I ride muni, I'm used to short cranks, have ran as short as 75mm. Short cranks turn over faster requiring less leg motion, so they are more efficient. Short cranks are better for folks who have less mass.

    I ride 150mm on all my munis, 170mm on bikes, but my plan is to reduce to 165mm on bikes and if a quality direct mount crank is made in 160mm I'll get em.

    Don't be afraid of short cranks!
    Awesome link - thank you!

  5. #5
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    Ended up going with these at only $35, 160mm. There is a 152mm version too. This has the standard 104 BCD 4 bolt mount to fit the narrow wide rings I already have, and should fit on the existing bottom bracket. I'll report back if they don't work, just in case somebody else ever find this thread with the same question.

    Suntour XTC Jr Crankset

    https://www.amazon.com/Suntour-Crank...W7G333QBR6YVZZ

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