KD5NRH

For me, it usually involves not re-stowing the rack bungee right away after taking something off the rack. Generally followed by getting back on the bike at some later point without noticing one hook hanging down until it manages to snag a rear spoke.

At least it's not an instant stop. Doesn't take long, though.

Rocky Gravol

On my latest bike builds, I've been waiting to buy new tires and brake shoes
until the very last.
I want to check for fender clearances first, or to see if I even like the bike.

Anyway, I got these old crappy tires on the bike for the interim,
and I decide to go for a speed run to see how the bike handles.

Now there is a hill by my house that a bike can get up to 45-50 mph with out trying.

Blasted down the hill,
waiting at the light at the bottom,
when one of my tires just blew up.

If it happened just thirty seconds earlier, it would not have been pretty.

Make sure your tires and brakes are at their best before you make speed runs.

PolarBear007

Nothing "bonehead" in the mechanical aspects of bicycling *yet* (i did/do those on automobiles....).

However, having been used to clips and straps, i thought i was missing something with all the hoopla surrounding these fancy new "clipless" pedals.... Yeah, so large busy intersection and i'm coming to a stop. Nice bright Fred-shirt on so EVERYONE can see me. Everyone.

The fancy new "clipless" pedals have a death grip on my fancy new "clipless pedal shoes" and i roll to a nice almost stop. And simply fall over. In front of easily 100 people.

I instantly jumped up (having gained a new ability to UNclip my fancy new shoes from my fancy new "clipless" pedals) with the vertical thrust of an Atlas V rocket and clip right back in...

I'm not sure if i was more stupid for not getting my feet unclipped or for clipping back in. Yeah, bonehead, that's me.

holden west

You know how black biking shorts have brightly coloured crotch padding on the inside? Well, so does everyone who saw me on my long commute this morning when I accidentally put my shorts on inside out and didn't realize it until I reached my destination downtown.

Cougrrcj 

But at least the padding works both ways!!

Don Marco 

I've lost my ability to effectively patch my damn tubes. I'm good at it too, or I once was.

I keep missing the hole. Three in a row.

Glasses?

noglider 

Take a felt tip marker and make a circle around the hole. Then make a cross over it. Then put the glue on, which obscures the hole.

Don Marco 

I've always done the cross thing, but used glue instead of a marker. I caught my problem though: I lose the hole when I go to pick up the glue tube and the cap is still on it. Used to be I could see the hole afterward, not so much any more. Markers is is.

seedsbelize 

I use chalk^^

Fahrenheit531 

Wright Bros

I just picked up a minty '92 Paramount PDG and thought I'd put some clear vinyl tape on the seat tube in front of the rear tire to protect the paint. It was smokin' hot in the garage and I kept puting the tape on and taking it off 'cause it wasn't just right...I eventually pulled the clearcoat off the paint! I needed something to protect the paint from ME! UGH

Kiddmen57

Was done this year on the US Olympic track bikes supplied by FELT.

arex

I commit bonehead moves so often, it just kind of blurs together. I just try not to think about it, less upsetting that way.

LouB 

Got one. You are gonna love this. So against the advice from my LBS, I'm renovating my first vintage bike, a 70's Gitane Grand Sport De Luxe. Not the best bike in the world, but a good one to learn on - thanks to all the great advise on here. So I'm confused as to which side of the BB has the stationary bearing cup and which the adjustable---I'm sure the adjustable was on the right side when I took them apart..that would mean the adjustable is on the drive side--despite everything I read...cept for one small problem. (I woke up in the middle of the night and realized this) I had the bike upside down on its bars when I was working on it. DOH! Gonna be a long build....

mountaindave 

The only reason you were able to do this is because of the French threading. You've experienced one of the many joys of owning a French bicycle.

rustystrings61 

So it's 1978 and I'm gonna go ride my new Puch Royal X. I dress in the attire of the casual 70s cyclist - gym shorts, T-shirt, tube socks and my favorite Adidas running shoes, because they're what I have that will fit inside a toe clip. Except my running shoes are starting to come apart, so using 16-year-old logic I decide the way to get on the road now is to tape my shoes up so they'll hold together a little longer. Somehow, shockingly, my Southern family does not own a roll of duct tape - but we have cloth adhesive medical tape so I use that and head on out.

It's a warm summer day in Macon Georgia, and I am feeling my oats and riding hard, really digging into the pedals. All is well for a while, until I approach a the intersection of my quiet road with a busier one. I squeeze the brake lever, the Puch slows down, and I go to pull my left foot out of the toe clip. Nope. Later, lying on my side still stuck to my bike, I would think about how strong adhesive can leach through cotton tape and bind things like shoe soles and pedals with a near unbreakable grip.

gearbasher

I keep air in the tube when I put the glue on. Easy to find the hole before glue is applied and after you can see the small spot the air caused the glue to bubble.

exmechanic89

Lol. Yeah I guess that pretty much sums up my feelings as well.

thumpism 

One of my favorite old loops was a quick ride downtown to Capitol Square, a left on 9th and a steep uphill to Grace Street for a left and back home. One time I got my right shoelace caught between the chain and chainring at the top of that hill with speed dropping rapidly and no room to maneuver. Of course, I overbalanced to the right so could not put the left foot down and could not get the lace to break by tugging my foot, so toppled righteously over into the left traffic lane. Believe it or not, I have been even less graceful at times.

Fahrenheit531 

Not too long ago I brought home a Takara.

It's gone now, but still.

philbob57

Put new chain rings on my TA Cyclotourist. Spent $27 (incl. shipping) for new Velo Orange bolts. Reminded myself to tighten the bolts as I rode. Then built a new wheel. Attended to the wheel as I rode; forgot to check the chain ring bolts. Sure enough, the bolts loosened and fell out, one by one. Finally, the 5th (of six) let go, luckily only 2 miles from home.

In unjamming the chain, I somehow bent the inner ring beyond all recognition. It's not easy to find a Pro 5 Vis 42 inner/middle ring on demand. (Thanks, veloduocycles.)

On the bright side, my wheel is doing great.

DiabloB

Couple days ago heard a slight "shhh shhh shhh" sound from my rear brake. Didn't bother checking what it was. Found out at 3000ft on a mountain that it was the sound of a loose brake pad slowly ripping my sidewall apart.

Then I found out my vintage Blackburn frame pump wouldn't go past 20 psi.

okane

I'm gonna try this next time to see if I will be able to find the disappearing hole after glue applied.

gaucho777 

Anyone realize what's wrong with this picture?

CroMo Mike 

Spokes chewed up from from overshifting the large cog.