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 > Question about tires..smell? Temp?

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cbigham

orange , CA

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Posted: 10/03/21 06:18pm Link  |  Quote  |  Print  |  Notify Moderator

Big fingers, small phone?? 76. Came un looked like 82. Fully loaded, bike in back, fuel, water propane 12240.

I noticed no bubbles, delamination I seen on other tires going bad. Just smell and heat.

whemme

Spencer, IA

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Posted: 10/03/21 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

cbigham wrote:

[image]

Hi all,
Have a question about tires..Tires are hot at 80, 82 psi returning from cold mountain trip thru local desert, traffic and home. Rear tires noticably hotter than fronts and had a smell like hot rubber.
Posted are the weights on the axels for my 23u thor. I notice I'm about 700lbs below the limit of the rear axle. Usually that axle is loaded about 600 lbs lighter. No smell, not so hot.

Is there a danger? Factory michelin tires, 2016 date. Don't recall smelling this. Tires not painful hot but hot. Touched the rims, axle shafts..not the source of heat. It's tire flex. This is the most I've loaded this. E450 chassis, 2017 model 14,000 gvwr. Usually carry a 300 lbs motorcycle on back never a worry. This time a 470 lbs bike and about another 50lbs lbs for the more stout rack tying into frame.

Any thoughts?


Thanks

Cb
Please be aware that adding 520 lbs behind the rear bumper has an amplifying effect of increasing the weight on the rear axle of about 780 lbs.


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phillyg

SWFL

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Posted: 10/04/21 07:21am Link  |  Quote  |  Print  |  Notify Moderator

Nothing to be concerned about IMHO, but you should invest in an infrared temp gauge. My rears will always show higher temps when pulling my fiver.


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noteven

Turtle Island

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Posted: 10/04/21 08:42am Link  |  Quote  |  Print  |  Notify Moderator

c'mon up to west Canada and Alaska for the next 6.5 months.

Tire heat will cure its own self.

I know, not helpful.

cbigham

orange , CA

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Posted: 10/04/21 02:32pm Link  |  Quote  |  Print  |  Notify Moderator

phillyg wrote:

Nothing to be concerned about IMHO, but you should invest in an infrared temp gauge. My rears will always show higher temps when pulling my fiver.


Your number, ratio is about what I calculated. I'm still under the 9600 lbs rear axle weight. That's the factor, tho this is the most weight I've had on the rear axle which likely is.

Holiday27

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Posted: 10/04/21 07:28pm Link  |  Quote  |  Print  |  Notify Moderator

Maybe placing the bike up front might help? I've had smaller bikes up front but a big bike could block some of the view so not sure.


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cbigham

orange , CA

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Posted: 10/05/21 07:30am Link  |  Quote  |  Print  |  Notify Moderator

A lighter bike, sure, we do on occasion carry son's bike there. Then you have issues of blocking radiator if bike big, and headlights. I calculated the 790r with rack puts about 1100 on the hitch when accounting for the center of gravity is about 3 ft or so further from the hitch. The rear is reinforced with 3 receivers, 2bon the frame rail, and the center hitch. It's all very heavy duty and reinforced.
Front, no.

4x4van

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Posted: 10/05/21 02:10pm Link  |  Quote  |  Print  |  Notify Moderator

2 quick thoughts; based on your weight ticket, you have only 660 lbs available on the rear axle; if you added the bike after that ticket, then your axle IS overloaded. Also, is that 80-82 psi that you referred to the cold pressure (before driving), or is that the pressure after driving and when the tires were hot?


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cbigham

orange , CA

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Posted: 10/05/21 08:16pm Link  |  Quote  |  Print  |  Notify Moderator

No, thanks.
I did the calcs before putting the bike on. Scale reading is with bike, rack on. The 82 degrees is hot, just in from the road. Readings were 77 prior to.

DrewE

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Posted: 10/05/21 09:23pm Link  |  Quote  |  Print  |  Notify Moderator

The 5 psi gain suggests that the air temperature in your tire increased by very roughly 17C or 30F -- perfectly reasonable.

(That's based on the ideal gas law: PV=nRT, or pressure * volume = quantity of gas * ideal gas constant * absolute temperature. In the case of a tire, the volume and quantity of gas don't change appreciably, and of course the ideal gas constant is also constant. Hence, the change in (absolute) pressure is directly proportional to the change in (absolute) temperature.)





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