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Anyone know how to fix a bicycle? 319

Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Anyone know how to fix a bicycle?
« on: May 08, 2020, 01:54:22 AM »
For some reason the kids bike is acting a little :crazy:
If he’s pedaling forward the bike seems fine, but the second he stops and glides the bottom pushes forward, then if he turns the pedals backwards you can see in the pic, the top part drops, and the bottom does the same by pulling?
I cleaned the chain down and oiled it, then also the gears but that didn’t do anything, I also tried adjusting they hi/low but I think I kinda screwed that up cause it’s not going down to the smallest gear, maybe I pulled the cable too tight? Idk this is soo not my subject, give me a old school single speed fine, but a 21 mountain bike no clue.. I watched a few videos but that’s what’s got me to the point where it’s not even going into the smallest gear, so if anyone knows anything as to what I’m doing wrong please let me know,, thanks..
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
Global Moderator Abandon All Hope Ye Who Enter Here... Posts: 46,564
Re: Anyone know how to fix a bicycle?
« Reply #1 on: May 08, 2020, 01:56:45 AM »
Not seeing a pic JR   :dunno:
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #2 on: May 08, 2020, 02:05:37 AM »
Oops,, rough day..
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #3 on: May 08, 2020, 02:08:54 AM »
The Mrs said something and I had a brain fart, thought maybe the rear gears aren't free, need a good oil job to get them to turn freely to allow the chain to keep up?
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #4 on: May 08, 2020, 02:57:45 AM »
Well, I had some time, I went out re adjusted it and it shifts 1-7, doesnt over shift, it’s spot on, and I lubed the crap out of the back bearings but nothing changed,, I’m stumped!
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
No Life Club Posts: 1,468
Re: Anyone know how to fix a bicycle?
« Reply #5 on: May 08, 2020, 04:47:23 AM »
Sounds to me like there is a problem with the freewheel/freehub.  This may be fixed by oiling it, but if not I think it would need to be replaced.
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #6 on: May 08, 2020, 06:53:54 AM »
Sounds to me like there is a problem with the freewheel/freehub.  This may be fixed by oiling it, but if not I think it would need to be replaced.
I lubed that thing so much but it still sticks, I’m guessing I can take that off idk if I need a special tool? But if not I’ll take it apart clean it and re lube it to see if we can get this thing going, I do have a stare rear wheel, idk if that mechanism will fit if the other is bad? Guess we’ll have to wait to fin out..
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
No Life Club Posts: 2,254
Re: Anyone know how to fix a bicycle?
« Reply #7 on: May 08, 2020, 07:18:17 AM »
The Gear Cassette at the rear should rotate back without affecting the rear wheel when pedalling backwards. The fact that it isn't seems to point to the bearings or freehub being shot. If there are any open still around you it's easier simply to take it to the bike store.

This might help but you're going to need some specialised tools to remove the cassette.

https://www.parktool.com/blog/repair-help/freehub-service


"It is better to lose health like a spendthrift than to waste it like a miser." - Robert Louis Stevenson
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #8 on: May 08, 2020, 07:24:40 AM »
Thanks, I’ll have to look it over and go from there, he should get a new bike but no point of getting one now if we might move in a few months,
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
No Life Club Posts: 3,974
Re: Anyone know how to fix a bicycle?
« Reply #9 on: May 08, 2020, 09:30:34 AM »
Been a long time since I pulled a bike apart, and I imagine there's more than a few ways they are put together.

I vaguely remember something about pawls sticking or jamming - bit of a clean, maybe replace a pawl or spring...

you might find a left handed thread in there somewhere, perhaps some circlips.

Nowhere near knowledgeable enough to prescribe any advice :P

If it were me, I'd go as far as I could until I didn't have the right tool (or a close enough tool :P ) to keep going then throw in the towel and take it to a specialist....

If you've got the time, space, and enough tools, it could be a fun activity. Go slow, don't force anything, take pictures so you can check the sequence for reassembly.




Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #10 on: May 08, 2020, 05:03:11 PM »
If it were me, I'd go as far as I could until I didn't have the right tool (or a close enough tool :P ) to keep going then throw in the towel and take it to a specialist....

If you've got the time, space, and enough tools, it could be a fun activity. Go slow, don't force anything, take pictures so you can check the sequence for reassembly.

You read my mind, but it’s just a cheesy bike, and by the time if I could take it to a specialist the cost for the repair is going to be close enough to just getting him a new bike, which he should have,
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
Admin Team Absolutely No Life Club Posts: 6,876 I brake for cake
Re: Anyone know how to fix a bicycle?
« Reply #11 on: May 08, 2020, 08:10:18 PM »
Sounds to me like there is a problem with the freewheel/freehub.  This may be fixed by oiling it, but if not I think it would need to be replaced.

 :iagree:

If it's not the freewheel then it might be the jockey wheels (the two small cogs) on the rear derailleur.

The Park Tool website has loads of good info about bike servicing: https://www.parktool.com/
Absolute Zombie Club Posts: 26,914 Plumbers Know Their Crap!!
Re: Anyone know how to fix a bicycle?
« Reply #12 on: May 08, 2020, 08:57:47 PM »
Ok, I watched a video and it pretty much broke it down for me,
I got the back wheel off and sure enough the set of gears aren’t spinning freely, there pretty stiff, unlike a casino roulette where you give it a spin and it just keeps spinning, this thing was tough and would stop on a pin!
I couldn’t get the set of gears off in order to clean them but I prayed them down then oiled the crap out of them, it did take some of the stiffness away but, still not great, I remounted the wheel, hooked everything up, then spun the crap out of it while hanging from the rafters, and of course it did the same but then after a few it seemed a little better.. so we’ll see..
JR

"The-Mad-Plumbarian" The Punisher Of Pipes!!! JR
Zombie Apprentice Posts: 10,231
Re: Anyone know how to fix a bicycle?
« Reply #13 on: May 08, 2020, 09:14:55 PM »
Being late to the party here.... but i agree with hiraethus. It seems that the chain is not going through the derailleur without hinder.

Otherwise it could also be the chain as that part with the two small wheels causes narrow bends.

Good luck JR
« Last Edit: May 08, 2020, 10:52:34 PM by McStitchy »

Formerly known as MTMatt
No Life Club Posts: 3,974
Re: Anyone know how to fix a bicycle?
« Reply #14 on: May 09, 2020, 12:15:25 AM »
You read my mind, but it’s just a cheesy bike, and by the time if I could take it to a specialist the cost for the repair is going to be close enough to just getting him a new bike, which he should have,
JR


There you have it, if you're resigned to a new bike anyway- you've nothing to lose with a little playing around on this one.

It's just like student doctors digging up a corpse to learn on...


No Life Club Posts: 4,944 Smurf it!
Re: Anyone know how to fix a bicycle?
« Reply #15 on: May 09, 2020, 10:55:07 AM »
It's just like student doctors digging up a corpse to learn on...

 :rofl: :rofl: :rofl:

“Strong minds discuss ideas, average minds discuss events, weak minds discuss people.” - Socrates
"I'm not feeling very talky today, off you smurf". - Smashie
Complaining is mental preparation for failure.
Si vis pacem, para bellum

 

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