Wednesday, May 9, 2012

Boom Shakalaka

That's what it sounds like.
Every time I hit a bump.
Boom! Shakalakalakalakalaka....
You get the picture.
Er, sound.
Sort of.
Okay, it's not that bad, just enough to drive me that side of insane as I couldn't for the life of me figure out what the hell was making the noise.
The noise coming from my new carbon frame.
Not a very pleasant experience.
I mean it only happened on really rough roads and at first I thought it was cable slap, cables hitting the side or some part of the frame.
No, I snugged them puppies up pretty good and the sound persisted while I held the cables and rode around.
So.
It's gotta be in the head set.
Well the other day, I finally got around to cleaning my bicycle and the fork came off:

















There it is.
The rear of the fork seems to be rubbing or knocking against the back of the head tube.
The frame has one of them hidden head sets, the bearings sit inside the head tube and the fork rides on some sealed bearings.
The top has the usual cap, but the bottom, well it's just the crown race.
Here's another look:

















What it looks like is every time I hit a bump, the fork flexes and hits the bottom of the head tube.
I thought I had the fork tightened down pretty good, so good that when I first rode out on it, it was sticking when I turned.
Over time the bearing loosened up and now it's like butter.
Except for that place where it's making contact.
When I took the stem cap off, I discovered something else.
The stem cap bolt was tightened down all the way and it was stuck to the expander bung thingy.
Difficult to describe, but what it  means is that the fork wasn't tightened down all the way.
I think.
Maybe just enough to let that fork flex and hit the head tube.
Confused?
So was I until I sat down and thought about it.
Anyways, what I have to do is set a wider spacer there under the stem cap so the bolt can snug down that fork.
Actually what I should do is take the fork off and cut the steerer down another half centimeter or so like I need to, but hey! I'm lazy so I'll wait and see if the spacer thingy works first.
If that doesn't work, I'll just fill the frame with some expandable foam to deaden the sound.
Okay not really.
In other news, we had a visitor to our classroom the other day:













That I believe is an orange spotted gecko.
Not native, but an introduced gecko.
He/she didn't introduce him/herself to me, instead deferring to stalk a bug.
Which it chewed on for a minute before spitting it back out.
I guess the bug didn't get an introduction either.
Well okay, I hope my remedy cures the boom shakalaka cause no self respecting bicycle should boom shakalaka without an introduction either.
If you know what I mean.

7 comments:

Andrew Cooper said...
This comment has been removed by the author.
Andrew Cooper said...

Gold Dust Day Gecko (Phelsuma laticauda). We have them all over the outside of the house and lanai, cute little guys. They love the banana patch too.

Trevor said...

Hope you get your fork BoomShakalaka sorted.... The men in white coats would have carried me off by now..!!

-Trevor

Steve A said...

It doesn't look much like the GEICO gecko...

John Romeo Alpha said...

Non-specific Fork Noise (NSFN) will drive a man crazy, for sure.

rlove2bike said...

It seems like I can hear any little noise when on the bike, but I have been accused of having selected hearing...That's odd, don't ya think. BoomShakalaka...That's a new one for me though.

limom said...

Andrew, they are a bit more rare here, but I'm starting to see more of them.

Trevor, the thing is, I was imagining it was getting worse.
The rattle I mean.

Steve A, I didn't ask and it didn't tell.

JRA, no kidding. I started to think my bottom bracket was imploding.

rlove2bike, the think I dislike the most is when I think I hear things falling off the bicycle.
If you know what I mean.