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  1. #1
    mtbr member
    Join Date
    Nov 2010

    carbon bike and heat (inside a car)

    Sometimes I bring my bike to my office, but the bike stay inside the car. unfortunately the parking lot has no / very little shades. Bringing the bike inside is a no no. I open the sunroof just a bit.

    For now, the weather has been pretty good, around 70F outside. but in a few weeks or so, it may get 80f, 90f, or even 3 digits outside.

    How safe is it to leave a bike in a car during hot days?
    My frame and bar are carbon, wheel are tubeless.
    Opinion please.

  2. #2
    mtbr member
    Reputation: borabora's Avatar
    Join Date
    Feb 2011
    I spend a lot of time in Hawaii. There, I transport my carbon road bike in my car and will leave it there for short times on occasion. I have a friend there who has set up his Suburban so that multiple bikes can be kept upright in the loading area (front wheel removed). He leaves bikes in there all the time for the day. Never heard of heat related issues.

    Of course one person's experience doesn't make a valid statistic. Personally, I would not be paranoid about leaving a bike in a hot car but I'd also try to limit the time the bike spends in the heat if at all possible.

  3. #3
    since 4/10/2009
    Reputation: Harold's Avatar
    Join Date
    Dec 2003
    I've never heard the bike mfr's say no. One thing worth noting, however, is that if you keep your tire pressures high, you might want to drop them in the car. If you keep your tire pressure near max, the heat could warm them up enough to get you a blowout.

    But I left my bike in my car in Texas summer heat at times, and aside from the metal bits being a little too hot to touch at times, I never had any problems with it.

    Don't do that with your helmet, though. I've seen enough melted helmets to know better.

  4. #4
    Plays with tools
    Reputation: customfab's Avatar
    Join Date
    Jun 2008
    Carbon parts often get cured at several hundred degrees, 150 in a car isn't a worry.

  5. #5
    mtbr member
    Reputation: 9iron's Avatar
    Join Date
    Jan 2013
    Think about how long it sat in that shipping container from Taiwan. Those things get hot on the upper deck.

  6. #6
    mtbr member
    Join Date
    Nov 2010
    Wow..thanks a lot for the input guys.
    I left my helmet too on the car floor. ok now I know, should bring the helmet inside. Good to know about the tire pressure, I usually run about 25-30 psi.

  7. #7
    mtbr member
    Join Date
    Jul 2009
    yeah i'd be more worried about tires than the frame. Had a tube burst when the bike sat in the sun for too long

  8. #8
    mtbr member
    Reputation: GuruAtma's Avatar
    Join Date
    May 2004
    If you have soft grips, they'll get even softer. Sometimes if you have a bike computer, the screen can get wacko, but it usually gets back to normal when the temp recedes.

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