A sprocket fell off my rear wheel ... like a rivet came out?
How do I fix this?
That's a rear derailleur pulley. It also appears half of your rear derailleur is missing. Get a new one.
And please, next time use the bike questions general.
>dat valve stem angle
Yep, missing bushing and end caps in addition to the bolt. You'll definitely need a replacement derailleur if the other half of the cage is gone. Might be able to get one used from a shop, local FB group or bike coop.
Before you fix, check that you have an actual bike and not some walmart piece of crap.
>>950401
looks like a sprocket
>>950410
It's a Specialized Rock Hopper
its clearly a downtube.
You are also missing the other pulley and half your derailleur cage. You need a new rear derailleur. Take it to a LBS or ask in >>>/n/bqg if you need help picking out a compatible rear derailleur.
>>950469
The downtube here is clearly OP, not the thing in OP's hand.
>>950401
op its probably more cost effective to just buy a new rear derailer from amazon or your lbs than to try and fix it.
You can by new pulley pair but I dont know what else is missing. That pulley looks ok so you could try to find some broken old derailleur and take the parts you're missing. Or just buy a new derailleur.
>>950471
Fuck off with your downtube shit
>>951109
don't get all bent out of shape
>>951109
Downtuber detected.
LBS said they couldn't fix it (this was before I saw the other replies ITT) ... so cool, ok I can get a new deraileur.
Is there a particular size or style that I need?
Here's what the mounting point looks like.
>>951337
Old one is a Shimano Deore LX, model RD-M550
Found this when I googled it: http://velobase.com/ViewComponent.aspx?ID=999f57a2-3151-4739-b96d-7bf3a81329c4&Enum=108
>>951339
fuck nigga all that dirt, you deserve to die painfully in an accident
>>951343
>for fuck's sake please take better care of your bike, look at all that grit and muck.
This so much. Although I keep my drivetrain clean and working order I was really surprised at how loud it was getting. The cassette looked fine, no shark tooth yet, but got a new cassette and chain and damn it felt like a new bike once I got it ll dialed in. I still have the old chain, I bet it was stretched out of spec. I have about 3500 miles on it
>>951343
Ya I live by the beach so it gets a lot of sand. I don't have an air compressor to blow it off.
>>951357
You don't have a hose, clean rags and a toothbrush either? You do realize your derailleur probably exploded because too much shit got stuck inside it?
>>951358
No hose, but the toothbrush is a good idea.
>thought my bike was really dirty as hell after a couple of trail rides without cleaning because of time/rain
>wouldn't even ride it like this, "poor mechs" I thought
>see OP's bike
Oh god.
OP if I can do it, you can do it. it takes 30-45 minutes to clean the mechs well enough and give it a superficial cosmetic wipe + apply new oil once its dry.
>>951357
Everyone's got his own method, but it doesn't require rocket science
you need an old brush/some old brushes, rags, water, degreaser, dry lube.
>take bike
>put under water (Got a hose? Use that. Not under any strong pressure and aim diagonally/from the top, not straight into the bearings. Sadly I've got no hose, so I use a 1lt water bottle and refill it at a nearby tap)
>keep liberally spraying around
then
>take light degreaser something
>I use WD40, which people will scream at you for using, but it's really okay if you just DEGREASE with it (it's 2/3 degreaser 1/3 lube, and displaces water, so it will penetrate nicely in your now wet bike, no it won't hurt it.)
>spray a bit of it on the cogs and chain, spin it while you're doing it
while you wait for the wd40 to sink in for a minute or two, clean the front wheel or something.
Once a couple of minutes have passed...
>get your brush and rags and gently rub the rear mech and chain clean
>rinse with a lot of water, repeat as necessary until most of the grime is gone, it doesn't need to be perfect, just remove any grit from spinning parts
>take particular care on removing grit from INSIDE the chain links, that's where the wear happens.
When everything is clean enough, let it dry.
>Once dry. take a reference point on the chain and while spinning it drip some dry lube on it, making sure it goes INSIDE the chain
>let lube sink in for 4-5 minutes
>take rag and spin chain while gently wiping off excess lube from the sides of the chain
Boom, youre done.
Things NOT to do
>do not lube your cassette
>do not over apply degreaser
>do not lube over degreaser without wiping it WELL off first (also a good reason to use WD40, as it evaporates very quickly and is easy to clean)
>do not lube a wet chain
And dunno I guess that's it.
lmao
>not dismount your bike every day to clean it
casual fred downtuber DETECTED
>>952712
Dismount it from where?
>you'll repair the bike of a qt fuccboii who knows nothing about bikes
>>952717
your mom
>>952729
XD
>>951357
You need a dedicate beach racer
>>952712
>not cleaning your bike while riding it
>>951339
Any low end Specialized Rock Hopper or Hard Rock will work fine with a Shimano Tourney rear deraileur.
>>952736
>Aggressive fat tyre bike
Noice. Just needs hydros and maybe singlespeed.
>>952736
>Schwalbe professional bike tires
9/11 would buy
>>952736
What bars are those? Any shots from other angles?
>>954791
http://road.cc/content/news/73765-koga%E2%80%99s-prototype-beach-racer
>a special handlebar
>>952736
Enjoy loading your drive train and race surfaces with silicates and quartz.
