BillyGuy

Hey, cyclists!

My name is Hrishi Tyagi and I'm from New Delhi, India. I've been cycling for a while and I really got into off-roading. But, it didn't end well for me.

Issue:

So, I gave my friend to ride my fat bike and I've Shimano TX in my bicycle. My friend tried to off road and he went off a cliff which was probably 12 foot high, and when he landed the chain went all wobbly. Now, since then my chain has a huge problem.

Whenever I start to pedal and release the pedals from moving, the chain comes or gets pulled forward from the rear derailleur. Or whenever I backpedal it does the same thing.

Video proof so you can understand better:
(Can't post for some reason)

I hope someone can help me out.

Your's Sincerely,
BillyGuy

BillyGuy

My YT name is Hrishi Tyagi Gaming and the video name is How Do I Fix This?

Bill Kapaun

Did you simply look and compare it to a properly functioning bike?
The RDER and or hanger is probably bent.

BillyGuy

Is there a way I can contact you or send you the link of the video? The forums is not allowing me to post the link.

seb1466

In addition to this ^ what you describe is typical of chain misalignment. There could be a number of causes associated with a 12' drop especially if the bike is not designed for such loads:
If the bike has through axles then see if the rear axle is broken or bent - check the drop-outs too for damage or distortion.
If bike has quick release axles see if the wheel has moved.
Check if the frame has distorted - especially the rear triangle.

Bill Kapaun

If you are too lazy to look at your own bike, I'm not going to waste the bandwidth to look at your video.

Retro Grouch 

Twisted chain?

smullen

Something is bent or out of alignment.
Could be frame, derailer, back rim, sprocket, parts of the chain.

Is the rear wheel still centered and not moved forward loosening the chain?

Flip it upside down on the seat and bars, then pedal it a bit, watching each part of the drive-train.

RocThrower

Is your freehub functioning ok? It doesn't look like it wants to move much, especially when you back-pedal. Maybe take the wheel off first and make sure the axle isn't broken and that the freehub spins freely.

shelbyfv

I think you should take it to the shop.

Homebrew01

As suggested, possible problems are bent rear derailleur hanger, the bit of frame the derailleur attaches to.
Derailleur itself might be damaged.
Chain might be bent.

Pedal backwards by hand and look closely at the chain, to see if it looks damaged.
Pedal forwards by hand, with the rear wheel off the ground, and slowly shift gears and look at the chain and derailleur. Watch out that it doesn't hit the spokes.

You can post pictures after you have 10 posts. You can greet other new members in "Introductions" forum.

WizardOfBoz

Find a free fileserving site (Google Pics?) and upload your pics or videos there. Get the URL for your uploaded pic. Paste the URL into a post.

alcjphil

I found the video:
OP's bike appears to be a very low end fat bike with nutted axle. A 12 foot jump would probably bend or break it. Start by taking the rear wheel off to check the axle, and the freewheel. the video is useless for diagnostic purposes.

Homebrew01

If your chain is on cog #2 , but your shifter is in position 3 or 4, you will not be able to pedal backwards, and you will have the problem shown in the video.

Pedaling backwards, Even being in gear properly, can cause skipping due to the angled chainline when on the larger cogs.

Suspend the read wheel, then pedal forward by hand, and see if it shifts properly, 1 gear at a time.
Be careful shifting to the largest cog. If things are bent, it may shift into the spokes.

hokiefyd 

From the video, it appears that your freewheel is locked -- it should, of course, spin backwards when you back-pedal as you attempt to do in the video. As for why it's not spinning backwards, that could be a number of things. It could be that the freewheel itself has broken internally. It does appear, halfway through the video, that you eventually do get some action from the freewheel if you back-pedal hard enough with the chain (pull it backwards). That tells me that the freewheel probably can spin, but something internally has malfunctioned.

A replacement freewheel is not expensive. Labor to change it at a bike shop would be minimal (maybe 10 minutes). There may, of course, be other things wrong with the bike, other damage created by the alleged 12-foot cliff. I would recommend taking it to a shop for closer inspection and diagnosis.

Homebrew01

Looks like the freewheel spins, just not properly in gear.

dabac

+1
Shimano TX derailer is another clue. India, a third.
I have the impression that the scale of what’s good and bad WRT bicycle quality is considerably shifted there.
I’d guess freewheel. Doesn’t take much of an adrenaline junkie mindset to bend an axle on those.

shelbyfv

Is that rust all over the chain and freewheel? Pathetic.

trailangel

1. Learn to light when you shoot photos or video. Can't see anything.
2. Never let 'friends' ride your bike.

Le Mechanic

Could be a broken spoke protector or something lodged between the big cog on the freewheel and the spokes/hub flange. Try to isolate the problem by removing the rear wheel from the bike and checking to see if you can easily ratchet the freewheel backward.