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Old 24 May 2019, 01:27   #1
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Bearings, how hot is too hot?

I have recently replaced the taper roller bearings on my hubs, the nut has been done up finger tight and then locked in place to remove all slop but the wheels rotate freely. I towed it 20 miles yesterday and felt the hubs afterwards, they were warm to the touch but not hot.

I can understand why they are warm but how much it too much? Iím now wondering if I have slightly overtighened them. How much heat is too much?
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Old 24 May 2019, 02:43   #2
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Will no doubt start a debate with differing opinions but I try to tighten them to the point where there is still a "just perceptible" amount of play at the wheel rim.
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Old 24 May 2019, 03:47   #3
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just warm is ok if too tight they will get hot the old way was to tighten up then slack off 1/4 of a turn tyers generate heat all that transmits into the rims etc.
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Old 24 May 2019, 03:50   #4
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I should have mentioned that one wheel is tightened so it just has the slightest perceptible amount of play, the other wheel has no play at all. They both get warm, but the tighter one slightly more!

If it’s normal for them to get a little warm then that’s ok, I will keep an eye out in case they get hot. Thanks for the replies.
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Old 24 May 2019, 03:57   #5
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if new bearings they will have to bed in anyway i change mine every year normal taper bearings i travel to scotch corner about 100 miles and check they are always warm. it's always recommended to wait until the bearings have cooled down before launching so its normal
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Old 24 May 2019, 04:26   #6
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Perhaps also remember that some of that heat comes from the hub ( brakes ) and the tyres . Ideally the brakes will be " evenly " adjusted from side to side and your tyres should be in decent nick ( and never more than about 7 years old - even if they look ok ! )
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Old 24 May 2019, 05:50   #7
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Thanks all, you have given me a bit of confidence that warm is ok but it’s a problem if they get hot.
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Old 24 May 2019, 05:52   #8
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Quote:
Originally Posted by Bern Hanreck View Post
Perhaps also remember that some of that heat comes from the hub ( brakes ) and the tyres . Ideally the brakes will be " evenly " adjusted from side to side and your tyres should be in decent nick ( and never more than about 7 years old - even if they look ok ! )
Thanks, the tyres were 8 years old but in good nik, but I have chosen to put new ones on anyway last week. I donít need the aggro of a flat when towing.
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Old 24 May 2019, 05:55   #9
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A wise move I reckon ! ( It's not really about a flat tyre , total break up is a distinct possibility ,with dire results )
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Old 24 May 2019, 06:05   #10
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Yes, ageing tyres that, on inspection, appear to be in perfectly good condition can suddenly delaminate on you under normal conditions (not nose heavy, over speed or hot). The whirling rubber can do quite a bit of damage, even to relatively heavy section steel.
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