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Old 15 December 2018, 03:18   #1
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Cold weather and tubes

Merry Christmas everyone , quick question !!

My rib is currently in the garden on trailer and axle stands, question is, with the cold weather the tubes deflate, would you keep adjusting pressure, or just leave it?

TIA

Steve
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Old 15 December 2018, 05:09   #2
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I leave mine unless there is a sag thatís noticeable. Temp change will have you in and out constantly if you want them to stay firm. If you do top them up remember to check when the weather turns
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Old 15 December 2018, 11:45   #3
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I second Neil's advice. I top up once I settle the boat for the winter, then leave them unless they get noticably soft.
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Old 16 December 2018, 10:59   #4
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I agree, so long as they are not sagging and possibly creasing in the coldest weather, pump then up just enought so that they keep their shape. The pressure on mine is about 0.8 bar. That should cope with a wide variation in temperature and hence tube pressure
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Old 16 December 2018, 14:19   #5
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I agree, so long as they are not sagging and possibly creasing in the coldest weather, pump then up just enought so that they keep their shape. The pressure on mine is about 0.8 bar. That should cope with a wide variation in temperature and hence tube pressure
Do you not mean 0.8 psi ?? ,0.8 bar is 11.6 psi
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Old 16 December 2018, 14:24   #6
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11.6 psi is 0.8 bar. The exact pressure is not important, the tubes just need to be 'In Shape' without any sagging or creasing on the coldest days. They will feel soft.
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Old 16 December 2018, 15:38   #7
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11.6 psi is 0.8 bar. The exact pressure is not important, the tubes just need to be 'In Shape' without any sagging or creasing on the coldest days. They will feel soft.
Normally tubes are inflated to 2 - 2.5 psi (0.14 - 0.17 bar). If you were to inflate to 0.8 bar assuming you don't have pressure relief valves, then I think you'd run the risk of damaging your tubes.
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Old 16 December 2018, 15:39   #8
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11.6 psi is 0.8 bar. The exact pressure is not important.

Try pumping them up to 0.8 bar and see if you still think that
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Old 17 December 2018, 16:43   #9
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11.6 psi is 0.8 bar. The exact pressure is not important, the tubes just need to be 'In Shape' without any sagging or creasing on the coldest days. They will feel soft.
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Old 17 December 2018, 17:06   #10
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Try pumping them up to 0.8 bar and see if you still think that
That's what it said on my electric pump, set to shut off at 0.8bar. Zodiac classic 550 pro. I have done this for the last 5 years
But you have ommited my other comment. The exact pressure is unimportant.. It is the shape which matters, no sagging or increasing at the lowest possible pressure. This will be different for different rib types. I used to consider my tubes to be much softer than the many other rib types i have driven
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