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Any tire or bike issues - cold ride to warm office to cold ride home?

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Any tire or bike issues - cold ride to warm office to cold ride home?

Old 01-14-13, 11:52 AM
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Bluish Green
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Any tire or bike issues - cold ride to warm office to cold ride home?

I need some advice before my commute ride home later tonight.

Normally, I get the bike out of the unheated cold garage in the morning, ride to the office, lock my bike up outside with the U-lock I leave on the bike rack, and walk into work.

This morning, it was 15*F out, and my U-lock was glazed over with ice from weekend precipitaition. I managed to get it unlocked, but couldn't get the lock to go back together to lock my bike up (and thought better of it), and brought the lock and bike into my 74*F office.

Now I'm wondering - are there any tire pressure or other issues I need to worry about when I leave tonight and take the bike from 74*F out into 20*F for the ride home? Should I just leave the pressure where it is? Should I walk it out there and lock it up a couple of hours early to pre-chill it?

Tires are Hakkapeliitta A10, running at max pressure of 65 psi when I aired them up last night in the cold, unheated garage. I have a floor pump with guage here in the office if I need it.

I apologize if I'm overthinking this one. It's my first winter commuting. Any advice is appreciated. Thanks!
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Old 01-14-13, 12:41 PM
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If you haven't added air to the tires, then it will be the same as it was this morning, once the temp normalizes. The pressure maybe went up 10% or so due to heating up inside, so they might be slightly overpressured (72 psi versus 65). I think your risk is minimal. (Pressure change is proportional to temperature change. You went from 480 degrees above Absolute Zero to 534, so the change in temperature (and therefore pressure) is 480/534 = 1.11 = 11% increase, or about 7 psi.) If I messed up the math someone nerdier than I will correct me shortly.
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Old 01-14-13, 03:39 PM
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I figured out why my U-lock wouldn't go back on correctly - the plastic twist-sleeve thingy cracked and came apart (probably due to water/ice and the banging I had to do to get it open this morning). The steel part of the U-lock is still useable, although I will want to replace it with a different one probably.

I'm going to take the bike out and pre-chill it. Thanks for the advice, doohickie, I think you are probably right on. But I don't want to chance it in this kind of cold, so I'm going to prechill the bike and then test air pressure just to be sure before the ride home. Thanks.
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Old 01-14-13, 03:48 PM
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I exploded a tube once, pretty sure it was because i inflated in the cold air, then put it in the empty cube next to me when i got to work. I was already pushing the upper limit of the tire's PSI, an hour into the work shift sounded like a gun went off next to me. Tube had unseated the bead of the tire and exploded.
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Old 01-14-13, 07:18 PM
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It all ended well tonight with a nice ride home. I let the bike chill outside for a couple of hours at 20*F, then checked air pressure right before I left, and they were right back at 65 psi, as Doohickie predicted. I should have checked them when they were fully warmed (just to educate myself), but I didn't think of it. Good thing they didn't pop, like squegeeboo's did.

Thanks again for helping me through an unexpected day.
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Old 01-14-13, 08:01 PM
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When bringing a 20F bike or anything metal, into the warm office there will be some condensation on the metal. Once in a while a little gets into a cable that you can't see, and does not dry. Then it turns to ice outside and freezes up. If the time inside is long enough for everything to dry off if will be OK. No way to know if there is hidden condensation in some places. If everything is not dry by the time you leave and a cable freezes, you would be better off leaving the bike outside next time. Sometimes all night at home inside will dry it out, sometimes not.. If there is a cable loop that does not drain, you may get ice someday. It's a common problem. If you get shifting problems on the way home and they go away after being inside, think about ice in the cable.

Don't worry about tire problems, nothing will ever happen. Blowing off the rim is a bit of tube pinched under the rim from a tire change. Never from temperature changes in the winter. Never.
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Old 01-15-13, 02:02 PM
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I do it everyday and have done it for many winters without issues. Home garage is not heated, but attached to my house and insulated so is always about 15-20 degrees warmer than the outside temp. I check and set up tire pressures based on conditions in the AM, ride to work and store the bike inside at 68 or whatever all day, jump on and ride home. I've not had any issue with the change in temps affecting anything performance-wise. The melting and condensation does encourage chain and cable rust but it's really just a matter of keeping things well lubricated and simple maintenance procedures to keep that at bay.
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Old 01-15-13, 03:35 PM
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Shouldn't be a problem as those A10's are very stout and will hold the bead fine even though the temperature increases some.
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