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    Bike pedals won’t move wheels and backpedaling issue.

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    14 Comments

    1. CAMINOdelaSERPIENTE on

      Buy a new , in spanish- masa o nucleo- abris el motor sacando la corona y las bielas. Ahí estará la masa, junto a sus rodamientos, debes repararla, comprar nuevos rodamientos o en su defecto comprar nueva masa.
      No debe costar más de 15$ dolars

    5. Wolfy35 on

      While it can be repaired the honest answer is that unless your bike repair knowledge is good enough to do this yourself and you already have the tools to do so you are looking at a cycle shop repair.

      Now comes the not so nice part. To get it repaired in a shop would cost a good chunk more than the bike is worth in labour alone never mind new parts. If you look in places like FB marketplace etc you will be able to pick up something in better condition and quality for less than it would cost to get that repaired.

    7. Antti5 on

      Your problem is that the chainrings are loose from the cranks. On the inside of the chainrings there should be a lockring that fixes the chainrings in place. Is it maybe loose?

      Most commenters here seem to have absolutely no clue about what they’re looking at, i.e. a one-piece steel crank.

    8. NthdegreeSC on

      I sometimes wonder what’s wrong with this sub. Someone comes here with a relatively simple repair and the answer they get is “get another bike.” Sure it may be a cheap bike and there may be more repairs, but the OP can basically fix this with a large adjustable open end (crescent) wrench.

      OP, the crank isn’t turning the wheels because the chainrings have come loose from the crank arm. Basically you need to do a bottom bracket overhaul on a one piece crank. Once you get the cranks disassembled, you will see that the chainrings are meant to be held in place by a boss cast into the right side of the crankset. That boss should line up with a hole in the arms of the chainrings (it is visible in the video). The rings are held to the crank arm by a cone nut that both holds the rings and provides a bearing surface for the bottom bracket bearings.

      Here is a video on overhauling a 1 piece crank and bottom bracket. Watch it. If you think you can handle the overhaul, then you can position the chainrings correctly, tighten the cone, and fix this problem.

      https://youtu.be/dpl_wlTBC8k

    9. Icy-Section-7421 on

      I understand the get a new bike comments. A bike to have major problem with the cranks set as shown is indicative of serious neglect and lack of maintenance. I am sure the rest of the bike is holding on by a tread.

    11. Darnocpdx on

      Could be as simple as too much slack in the chain coupled with an over tightened back wheel.

      Loosen the wheel, back the cones off (small nut on the backside of the frame) add some lube to them. Wheel should spin freely now. Then when you tighten the wheel, keep a wrench on the cone to hold it in place as you tighten the outer nut.

      I helped a kid recently with a similar problem (though it was a single speed) , because his dad used an impact to tighten the wheel on the frame when he changed a flat, and they couldn’t figure out what was wrong.

    12. shred_o_phile on

      It’ll never happen but people really need to stop trying to fix disposable bikes. Especially ones that are already 20 years old. It was trash when it was new, now it’s 20 year old trash. Let it go. Sure hope no one downvotes this

    13. Greedy_Pomegranate14 on

      Oh wow that’s impressive. Something is wrong with the interface between your cranks and your chainring. The cranks spin but the chainrings stay still.

      It’s been a while since I’ve seen how chainrings attach to 1 piece cranks, but I think they have flats and then a Lockring to keep the flats engaged. I’d take your cranks off and make sure the Lockring is tight and nothing looks damaged.

    14. sandwichmaker42 on

      If people want to stop bikes from going into the landfills, then they should maintain them, rather than riding them for years doing nothing to them till it adds up to hundreds of dollars in repairs.

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