What kind of lock do you carry on your commuter? I already have two bottles so there is no room there.

If you don't want to hang anything off your bike, check out the options from hiplock. You can get them through amazon. Basically makes a heavy chain a belt. They're only long enough to loop through the frame. Either get a lock set for your QRs or bring a cable lock as well if you're worried your wheels will disappear.

Abus Bordo Granit X the pouch they fold into has straps to Hold it securely around a frame tube.

It can Go under the downtube..

And Get Pitlock Replacement skewers for the QR ones ..

none. I have a big ole U Lock I leave mounted on my work bike, and another U Lock I have in my messenger bag on days I am just tooling around the city with friends. My commuter gets to live a life indoors.

Having said that, I recommend a U Lock from Kryptonite, Bulldog, or Abus.

Can you leave your lock at work? I leave my Abus U-lock on the bike rack at work, saving myself some weight.

I have a great big giant ABUS polygonal chain with an armored padlock that I use for the "leave on site" method - which currently isn't part of my commute thanks to a great building manager who lets me use a staff-only stairwell to park my bike.

I also have an OnGuard cable lock, which is a bit beefier than the usual cable lock, but probably not really that much better to stop a determined/equipped thief. I only use this in areas that have pretty good security anyway. It fits in my rack bag, but takes up more space than I would like. It also comes with a way to mount it on the frame, which didn't work for me/my bike. I'm tempted to replace this with one of the folding link type locks, but curious to know what others think of these. It would be more compact in any case.

Absolutely love the Serfas puck lock. I fit mine in my seat bag and wife has hers mounted to the frame. When it is in the frame holder it is actually locked in place. Switched over to the Serfas Puck after getting tried of carrying around a heavy U lock. I am sure the U lock offers a bit more security, but in all honesty, all a lock can really do is keep honest people honest. 30 seconds to cut through a Puck lock or 45 seconds to cut through a U lock.
The Puck lock is small when rolled up and actually a little larger than a 8-9" U lock.

Pitlock skewers on the wheels, seatpost and headset. Abus 140 Mini U-lock in my back pocket.

I don't. I leave mine locked around the sign post (nice weather) or inside the parking garage on the post-and-ring (foul weather).

For evening and weekend errands, I use a lock I keep at home, and it rides inside a pannier.

Alternatively, when running light errands on the Litespeed, I just lock it around the head tube (above the top tube) and ride away.

Never could figure out why some people insist you need some kind of special holder mounted on the bike. Why?

I use Pitlocks and keep the locks at work but sometimes need a lock before work or after. For this purpose I purchased a Velo Orange Constructeur rear rack and I fasten a U lock to this.

I keep my lock bungeed to my rear rack. If I need the rear rack for something else I move the lock to my front basket.

I rented a bike one day that had no bungees, so I had to lock the lock on the frame and rear rack. I think a rear rack is the way to go. Multifunctional.

i don't see too many people here with pitlocks and it makes no sense to me. It's far more secure and more convenient than bringing a cable and lock for your wheels. pitlocks aren't cheap but they are the best secured skewers around IMO. only downside is I think a lot of the newer sets come with only 1 pit vs 2 like the older sets.

I use a NYC kyrptonite heavy duty u lock mounted to the handlebar. + an armoured cable lock as a second measure. Nothing says to thieves to screw off like a couple of nice locks. For an added bonus I suggest you park around other bikes that are easier to steal.

I don't carry any lock on my bike; occasionally I carry a Kryptonite U-lock in my pack but rarely carry that with me. Anytime I go inside the bicycle comes with me.

I carry Abus Bordo Granit X-Plus.

It's a good lock that packs easily on the bike.

Put my knowledge and experience into these two articles. One about locking techniques, one about locks:

Locking a bicycle

Bicycle locks

Trelock FS300 Trigo

It's a folding lock. Fits in its own holster which mounts like a water bottle. Compact, sturdy, not too heavy and it's easy to work with. No, I wouldn't trust it overnight in NYC, but that's not what I use it for. I only carry it for emergency lockup if I break down and it's too far (or I'm unable) to walk the bike.


-Kedosto

I have a pinhead on my front wheel. My lbs advised that the pinhead skewer was too short for my internal hub, and it could cause issues down the line. I ended up getting a kryptonite messenger mini lock with the wheel attachment.

I ride with a backpack on my rear rack most of the time. It is a hassle for me to open it, stuff a 2+ kg lock in it, along with other stuff I haul. If I'm buying some fruit and vegetables, I need to make sure the lock is at the bottom of the backpack. Then, if I need to lock the bike again somewhere.... you see the problem?

That's why I prefer that bike frame carries the lock. So it doesn't use my pannier/backpack space.

I use a Kryptonite Combination ULock. I carry it in my rear seat bag, it's pretty much exactly the right size.

As others have said an alternative is to leave a lock locked to the rack at work so you don't have to carry it back and forth.

I use a generic ulock that I carry in a pannier.

My current commuter has a lower resale value than the tool required to cut the lock.

This strategy would be unacceptable for most people here though.

I know this is not new, but I couldn't resist adding this to the convo.....

Homestar Runner: Strong Bad Email - Bike Thief

Best line that still makes me laugh: "Any bike with a water bottle holder is a complete waste of bike!"

I use a Kryptonite New York U-lock at work, with a 4' cable looped through the front wheel. I leave the lock and cable attached to the rack at night and over the weekends, so I'm not having to lug it back and forth. I also carry a small combination cable lock in my seatbag or racktop bag at all times. I only use this lock for quick stops.

Like others, I leave a U lock at work locked to a bike rack which is inside a parking garage. It has not left this place for at least 5 years.

Cable lock in my trunk bag, I can lock my bike inside my workplace. For the street, case hardened heavy duty chain + armored lock, also in my trunk bag.

I guess when you have a lock on you in a backpack or somewhere on the bike it still weighs the same. Not I care much for the weight issue but where and how to locate it is the issue. I ride to work a few days a week and I ride on Sunday as well. I don't carry my backpack on my Sunday ride but I usually don't go into any stores. Bike theft is vary rare. I just want to keep people honest.