This may be a bit OCD, but I just purchased a new CF Madone. The temp ouside drops in the 20's at night and I have my bike in the garage. No problem, right?, or should I bring it inside until it gets about 32?

Thanks.

I do. But it stays in my house in July, too. Actually, it was only ten degrees warmer in July than it was today, so that isn't saying much. My bike lives indoors when I'm not riding it.

My bikes are metal (well except my mountain bike) but they live inside. Mostly just cuz I like to have them close at hand.

Inside winter and summer.

all of my bicycles live in my house with me all year round. you don't make a loved one sleep outdoors. i think a garage would be considered "indoors" in most cases.

If the carbon gets very cold it could crack if it has an impact with something.

Always inside except when riding.

My bikes stay in the garage, that's where they belong until ridden.

Mine, too. So the rest of you apparently spent big bucks on bikes that are too frou-frou to go outside? They make airplanes out of the same stuff they make bikes out of, and they withstand temperatures from at least 100 below zero to 100+ above.
A bike is a piece of outdoor equipment. It's going to get dirty, scratched, cold and hot. It doesn't care.

I bring it in every day. It's worth more than my car.

I'll bring mine in, but not because of the cold. It just stays a little cleaner in my basement.

Although your bike is not made from water, the concerned cyclist is aware that moisture in the air 32°F could freeze within tiny gaps in the CF causing micro stress fractures that reduce the life of the bike. Even before that happens, you'll notice that chain and bearing lubrication gums up causing reduced performance. One thing some people don't appreciate enough is the strain on the bike from leaving it in the same position for too long. So if you must leave it with the weight resting on the wheels, be sure to rotate them just slightly each night to prevent flat spotting the wheels and bearings.

Alternatively, do nothing and don't worry about it. Bikes are way tougher than people give them credit, and a garage is a great place to protect them. Temps down in the 20's is nothing. Your bike is designed to bomb down the side of a mountain in sub freezing temps. I've been riding in all kinds of slop for years and I wouldn't consider being as careful with my bikes as it sounds like you are with yours. You truly have nothing to worry about.

This. Don't listen to any of those warm weather wussies who actually worry about their bikes getting cold.

All my bikes live indoors unless ridden as I don't have a garage. Even when I had a garage, I wouldn't dare park a $1,000+ bike in it, I've had a cheap WalMart bike stolen when I was younger, and theft from garages were common in my city.

Yeah well if you want to protect your investment by taking the simple step of storing it in a climate controlled environment the bike will last that much longer.

Garages experience large temperature and humidity changes that cause unnecessary wear on certain parts, especially anything steel.

Garages also make your bike more susceptible to theft.

Unless your space is extremely limited do yourself a favor and keep the bike inside. There's no reason not to.

My bike is in my room. My parents don't like it in the living room.

The spare room is my bikes...

The two I ride most (and cost the most...) stay inside, especially my commuter. Don't have to mess with the tires as much when I leave them inside at night. That being said, I think there are still 4 or 5 bikes in the garage, plus two motorcycles, another two moto's outside, and 4 bikes upstairs (inside). Me and my dad like two wheeled machines if you couldn't tell!

News flash: the temp and humidity changes will be significantly larger going between inside and outside than garage and outside.

In any case, you don't need to worry about this stuff at all (including with steel bikes which I've also owned for many years). The wear and tear of keeping a bike in a garage is absolutely nothing compared to actually riding it. If theft is an issue in your area, that's one thing. But don't worry about hurting your bike.

Aside from getting water and slop on stuff in the house which your soon-to-be ex wife won't appreciate. If you only ride when it's dry, I'll let you in another trade secret -- your bike won't melt if you ride it in the rain...

Bikes inside year round.

A really humid garage can cause rust to form on bare steel parts in a short amount of time. I realize that a bike will experience humidity outdoors but if you bring it inside that limits the effect, where as if you keep it in a garage it is exposed 100% of the time. Unless you have a climate controlled garage, in which case you are a gangster.

I know my bike won't melt if I ride it in the rain but thanks for letting me in on your "trade secret". My wife doesn't care if I make a little mess. And I definitely bring my bike inside after I ride it in the rain so I can thoroughly clean it off.

I'm just saying that unless space is really limited, or your wife doesn't allow you, there's no reason not to bring your bike inside.

My bikes live inside but I wouldn't worry about it too much if they have to live in the garage, even during cold months. I have plenty of customers that bring their bikes for CompuTrainer class going from extreme cold outside to a warm, humid environment inside the store. I have seen exactly ZERO issues with carbon fiber bikes going from hot to cold or vice versa.

my bikes sleep inside

I live in PNW -- it rains most of the year here, and the relative humidity is high during the rainy season (which is basically Oct-June). If you bring your bike in the house, you will track mud everywhere.

The last bike I sold (steel) had about 60,000 miles on it. I got 1/2 of what I paid for it brand new and got 10 calls within the first 24 hrs of listing it on CL (I gave it to the first caller). My current workhorse bike is steel. It gets wet all the time, I never dry it, and it lives in the garage. The amount of rust I get is minuscule -- certainly nothing worth worrying about.

Seriously - you think there will be a meaningful difference in longevity to two properly maintained bikes just because one is kept inside the house and the other is fully sheltered, but in an unheated garage? Seriously?

The reason to bring the bike in door is not temp related humidity related ozone related dew point related or cats and dogs related.

Bring the bike in doors to keep it from getting stolen because somebody saw it sitting in there last summer and he just happened to be walking past your open garage that you forgot to close in your drunken stupor last night,

Thank you. Applause is always welcome!