Obeast

Maybe cassette and crankset? I donīt see any reason why road or mtb shifters, rear derailleur, front derailleur, brake calipers, or even chain should raise any alarm bells?

Elvo

Battery for your hidden bottom bracket motor

veganbikes

What exactly do you mean? Are you trying to turn your carry on luggage into a bike? Or are you smuggling bike parts across the border from Canadia? You can actually in many cases take full bikes with all the components onto airplanes just pack them in a box or sometimes in a bag. Batteries are a different story and you would double check into those (say for Di2 or eTap or EPS or your e-Bike) with your airline.

_ForceD_

Yeah, all of it probably will. The only bicycling relate things I've taken on carry-on is clipless pedals, and a Park Tool wrench. The first time I took the park wrench the TSA guy told me that it was too long...but after inspecting it closely...he'd let me take it. (Prior to obtaining that wrench I always carried a standard Craftsman 15mm wrench which didn't exceed length restrictions.) He asked if I had checked luggage, which I did, and he said on my return trip to put it in the checked luggage. BUT...they also are always concerned with the pedals...just because they have no clue as to what they really are. So, you're probably better off putting anything in checked luggage. I would think the cranks will be too long...like my pedal wrench was.

Dan

seedsbelize 

I've carried saddles and derailleurs.

dedhed

Anything that looks like drugs, bombs, or weapons. Or anything you wouldn't want to give up.

wide45

Velodog

spinnaker

Why on earth would you go through the trouble of removing a crankset or cassette? I don't know why you would want to go through the trouble of removing any of those items. Maybe shifters or a rear derailleur.

GerryinHouston

Many humorous answers.

My experience from my trip last year in Europe, including a week long tour with (rented) bikes in Holland/Belgium.

I was carrying my bike repair tool bag (weighs a bit) in the carry-on, in case our luggage got lost and to lighten up our normal suitcase. Boarding the plane from Zurich to Hanover (prior to our tour) the safety screener removed and confiscated my needle nose pliers 'because they could be used as a stabbing weapon' (making a characteristic motion). The fact that they were selling Swiss Army knifes at the duty free didn't sway him... You don't want to get into an argument with these guys, so I waved goodbye to my 20 year old pliers and moved on.

A Brooks saddle mounted on a seatpost could be considered a tomahawk...

Obeast

I think smuggling 10 pairs of high end shifters and derailleurs in my small carryon luggage will be in my future as I keep finding perfectly nice 1990s bike frames in the trash with crap components.

02Giant 

I brought chainrings through DIA in 2011, it was suggested that I check them the next time.

Tape2012

+1. Having been through screening hundreds of times, the guidelines are only that. Guidelines. When you are in the screening line your fate is in the hands of the screener. There's no appeal process and quoting their own guidelines won't help. If they don't like what your carrying, it's your choice to give it up or miss the flight. If you want to keep it, check it.

I've had to give up pedals, wrenches and other tools but at other times made it through with pocket knives, Gerbers, etc.

Their rules are generally useless and inconsistently applied. Make your decision ahead of time based on the value of the item and the cost to check it.

pdlamb

+1

jefnvk

Depending on where you are going/coming from, I'd worry far more about customs than security with ten high end groupsets.

indyfabz

Dance, monkeys! Dance! P.T. Barnum was right.

shelbyfv

Yeah, if OP seriously needed "10 pairs of high end shifters and derailleurs" he could try this new thing called online shopping. Delivered right to his lair!

kuroba

I wasn't allowed to take a crankset on carry-on luggage (had to go back and have the bag checked). Haven't had any problems with shifters, chains, cassettes, tubes, etc.

(Where I live components are kinda expensive so whenever I visit the capital I make time for a small shopping trip).

martianone

It is so arbitrary!!
Shortly before the holidays, I was on a flight for business. I took to tsa, a small bike bag I was planning to carry with me on a Jan 1 holiday to a warm climate. My bag contained spare tube, self stick patches, a quick stick, park mt-1 tool and a small Lezyne pump. Explained I had travel booked, wanted to carry on my clothes bag with my bike bag inside. Tsa looked at it and said it would be ok.about 10 days later, at tsa in the same airport, same bike bag in same carry on clothes bag was a NO go! Didn't like my pump or tool. Took my bike bag back to car. Got back in tsa line, got pulled aside for extra screening.

gvelayo

On my way to the US, I was stopped by airport security in Incheon, Korea because of a Lezyne mini tool in my carryon bag. Apparently, the lady assigned in the security xray mistook the tool as some sort of weapon. Good thing her coleague noticed that the mini tool is used for cycling.

CliffordK

Yep, TSA is a bit weird. Get to the airport an hour or two early... just in case.

My biggest thing is that I have to remember to go through all the pockets of my backpack. I've had to go back and get a cardboard box to check a pocket knife and mini monkey wrench that I had forgotten about, but showed up on the X-Rays.

The silliest one.. I had a steel sculpture that I had made with a heart and steel arrow and blunt brass arrowhead. Anyway, because this steel arrow was part of the sculpture, it was considered a weapon and had to be checked. Another cardboard box piece of luggage

I'd think a right crank with chainrings would make a great weapon... although perhaps more of a defensive weapon than offensive. But, who knows. In the end, it is just a bike part.

Why not just put it in a bag and check it through?