HELP! Unidentifed part in rear hub.

[SexJihaad9/11]

After hearing a rattle in my road bike's rear hub for a few days I finally took it to the LBS and the guy pulled this part out and sent me on my way.



The bike seems fine and the rattle is gone but I'm sure this part isn't just something the manufacturer put in for laughs. Also I don't really trust the guy but there aren't a lot of good bike shops where I live.

Anyone who knows what this part is, please let me know and tell me what I ought to do now.

[Anool]

Did he pull it out from INSIDE of the hub ?

to me, it looks like one of two possibilities :

this is the kind of bolt used to fix the chainrings to the crank
or, such bolts are used to fix the caliper brakes to the frame.

But, I cannot fathom what it would be doing inside a hub.

[SexJihaad9/11]

Did he pull it out from INSIDE of the hub ?

to me, it looks like one of two possibilities :

this is the kind of bolt used to fix the chainrings to the crank
or, such bolts are used to fix the caliper brakes to the frame.

But, I cannot fathom what it would be doing inside a hub.

It was inside the hub. So, you're saying the manufacturers did put it in for laughs?

[Anool]

I don't see any fasteners/bolts like the one you got in this document
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/FH/EV-FH-7800-2252_v1_m56577569830537885.pdf

[dandekarvaibhav]

Anool you rock! I was gonna post the same exploded view.

Wierd looking part huh!

Looks like an end cap to "something" while allowing "something" project out.

I may sound demanding but believe me... only curious... can you help us visualize how it was inside the hub.... Not getting any sense of scale too.

[Anool]

....I may sound demanding but believe me... only curious... can you help us visualize how it was inside the hub.... Not getting any sense of scale too.

yeah, me too. This case is so curious, it's begging to be solved.

[SexJihaad9/11]

Here you go.



It went along the axis of the hub, with the QR skewer through it. Where exactly it was, I can't tell. That's what I'd like to find out actually.

Go nuts, gentlemen.

[psynide]

just wondering, maybe this was used as a spacer? in any case, it doesn't look like a proper spacer ! probably the person assembling the hub ran out of it and pulled this thingamajig lying on the floor !
just like anool has said, it looks like a chainring bolt. weird !

[prabuddhadg]

Did he pull it out from INSIDE of the hub ?

to me, it looks like one of two possibilities :

this is the kind of bolt used to fix the chainrings to the crank
or, such bolts are used to fix the caliper brakes to the frame.

But, I cannot fathom what it would be doing inside a hub.

It was inside the hub. So, you're saying the manufacturers did put it in for laughs?

Not trying to help here, but I have heard of Detroit cars from the 70's with rattling noises inside a door. With the lining removed, it revealed a beer can - probably left inside by a worker assembling the car.

[SexJihaad9/11]

Not trying to help here, but I have heard of Detroit cars from the 70's with rattling noises inside a door. With the lining removed, it revealed a beer can - probably left inside by a worker assembling the car.

Most of what Jeremy Clarkson says is purely for effect and not true at all. Sorry to break it to you.

[prabuddhadg]

Not trying to help here, but I have heard of Detroit cars from the 70's with rattling noises inside a door. With the lining removed, it revealed a beer can - probably left inside by a worker assembling the car.

Most of what Jeremy Clarkson says is purely for effect and not true at all. Sorry to break it to you.

Oh No! I am crestfallen!!

[SexJihaad9/11]

Anyone?

[cryptic_abbreviator]

looks like one of those things from a V brake

off to check diagrams and see if that notion is right

I distinctly remember something like this from when the brakes on the wife's Q5 were not working (would not spring back) and i had taken the brakes apart.

ciao
gr

[bblost]

Is this called a Hub Cone.
http://www.ihpva.org/projects/tstrike/hub.jpg

http://sheldonbrown.com/cone-adjustment.html


I have seen a similar looking part in my motorcycles rear tire.
This is the last part in the tire. After this is a small cylinder about an inch long. Then the frame. After this the axle bolts head.

I always assumed this part was there to provide a smooth even surface. So that that cylinder gave balanced pressure to the wheel.

Motorcycle: 03 Thunderbird.

[SexJihaad9/11]

Is this called a Hub Cone.
http://www.ihpva.org/projects/tstrike/hub.jpg

http://sheldonbrown.com/cone-adjustment.html

Thanks. Seems like it isn't non-essential then. I'm going to take it to a better bike shop and see if they can put it back in.

[dandekarvaibhav]

Is this called a Hub Cone.
http://www.ihpva.org/projects/tstrike/hub.jpg

http://sheldonbrown.com/cone-adjustment.html

Thanks. Seems like it isn't non-essential then. I'm going to take it to a better bike shop and see if they can put it back in.

What thanks???

Can you imagine a free rotating wheel without a hub cone???

[Anool]

definitely not a Hub Cone. Hub cone needs to have one side as a ball race (for the bearing). This one doesn't have any. Its a hollow bolt with internal and external threads. Only place I've seen those used is for the chain ring and the caliper brakes on road bikes.

[Anool]

also, the skewer goer right thru the hollow axle, so I see no reason to have any fastener which will have internal threads.

[SexJihaad9/11]

So I went to a couple of bike shops, even ones that cyclists in Panjim recommended. They basically dithered for a bit and then said they were too busy to open up the hub and put it back in.

I could open up the hub myself if someone told me what tools I would need. Maybe this thing's pair is still in there and I can figure it out.


So it isn't a hub cone? The plot thickens then....

[cryptic_abbreviator]

and the caliper brakes on road bikes.

Ah! so my bike and not the Q5

ciao
gr

[SexJihaad9/11]

Alright, so.

My hub finally gave out and I ended up with a terribly wobbly wheel and a grating from the rear hub on the SCR2 during last Saturday's Bhaji Ride with the cyclists from Panjim. This left the bike essentially out of action for almost a week. I had taken it to many LBS's in the past but no one was willing to bother with it. I even bought a sprocket tool only to realise that I would also need a chain whip to do the job.

Long story short, Ajay at Escapades in Ponda was finally free this morning so I cycled the 90+ Km round trip on the MTB with the offending wheel bungeed to my 'bars.

We took apart the hub and figured out where the offending part goes. It goes inside the hub and holds the freewheel mechanism in place.



Seems to have cured the problem. Ajay if you're reading this, I can't thank you enough for taking the time to figure out and fix the problem.

[kk27]

A Free hub nut, though I'm unable to imagine the body stayed in place even after this was removed!!

[SexJihaad9/11]

A Free hub nut, though I'm unable to imagine the body stayed in place even after this was removed!!

I've done a thousand Km including the BRM without it. Thankfully I don't seem to have ruined the hub.