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Old 07-02-2013, 07:18 AM   #1
grant22 OP
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Am I asking for a flat?

It's been really hot here in AZ and wanted to day trip the bike to the higher elevations where it's cooler today. My concern is, with hd tubes at proper pressure, and an ambient high of 124 degrees for about an hour till I get into the higher elevations, am I asking for a flat due to tube failure? This would be at around 80 mph for an hour in that heat.

Let me know if I'm being a Sally or not, please.

Sure, I could be in the lake, but I'm really itching to ride my new 990. I've only put 180 miles on 'er so far.
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Old 07-02-2013, 08:25 AM   #2
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I've spent many days in Death Valley with UHD riding at this speed in this temp and never had an issue.... But it doesn't mean it can't happen obviously.
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Old 07-02-2013, 08:52 AM   #3
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I'd ride.
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Old 07-02-2013, 09:00 AM   #4
grant22 OP
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Ok, thanks dudes. Off I go.
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Old 07-02-2013, 09:15 AM   #5
fullmonte
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You're only asking for a flat if you don't carry a spare tube. Be prepared and be OK.
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Old 07-02-2013, 09:31 AM   #6
grant22 OP
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Truer words have never been spoken.
I was just curious if all things considered, would it be negligent to ride and expect the tubes to not overheat and blow. Spare tubes will travel with me on this 'light' adventure ride, don't want to start out behind the eight ball. Tubed street tires/wheels are very new for me.

grant22 screwed with this post 07-02-2013 at 10:09 AM
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Old 07-02-2013, 10:02 AM   #7
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Maybe drop 3-4 PSI from your std pressure to allow a little more for heat build up then go and enjoy.
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Old 07-02-2013, 11:57 AM   #8
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I thought lower pressures generated more heat?
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Old 07-02-2013, 11:59 AM   #9
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low pressure

Quote:
Originally Posted by Two Moto Kiwis View Post
Maybe drop 3-4 PSI from your std pressure to allow a little more for heat build up then go and enjoy.
lower pressure will cause higher temperature! more flex more squirm more heat! higher starting pressure will lower internal temperature.!!
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Old 07-02-2013, 01:55 PM   #10
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Quote:
Originally Posted by MortimerSickle View Post
I thought lower pressures generated more heat?
If too low then definately.

Quote:
Originally Posted by kennyd View Post
lower pressure will cause higher temperature! more flex more squirm more heat! higher starting pressure will lower internal temperature.!!
Yes it will IF it is too low.

Dropping it slightly from full road pressure won't induce any more heat unless you go to low then yes definately it will.

At temps the op is talking the tire is going to super heat regardless thus dropping the pressure slightly should help with over inflation from heat.

It also depends very much on the type of tyre too, we run 33 PSI in our Heidy rear two up with house and contents here in Central America because of heat and it doesn't seem to have any ill effect on handling or squirm, well no more than they normally walk around the twisties.
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Old 07-02-2013, 09:58 PM   #11
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Did two hundred miles today, 50/50 slab and trail. All went well and was a blast. Came home with a dehydration headache tho!
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Old 07-02-2013, 10:11 PM   #12
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WOW! I must be a carefree soul. People come up with things to worry about that never in my 58 years even entered my mind.
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Old 07-03-2013, 01:21 AM   #13
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High ambient temperatures require high tyre pressures to be on the safe side. The tyre temperature will be higher than the ambient in any case. Therefore, you start off with a higher than normal temperature in order to minimize tyre rolling friction.
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Old 07-03-2013, 07:56 AM   #14
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Quote:
Originally Posted by mousitsas View Post
high ambient temperatures require high tyre pressures to be on the safe side. The tyre temperature will be higher than the ambient in any case. Therefore, you start off with a higher than normal temperature in order to minimize tyre rolling friction.
+1
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Old 07-03-2013, 08:40 AM   #15
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Quote:
Originally Posted by grant22 View Post
Did two hundred miles today, 50/50 slab and trail. All went well and was a blast. Came home with a dehydration headache tho!
...and no one died and smile was gained ... perfect!!

Quote:
Originally Posted by sieg View Post
WOW! I must be a carefree soul. People come up with things to worry about that never in my 58 years even entered my mind.
I agree with this, 36 years of riding and 40 bikes later the differences at "our" level are negligable unless you are out of the norm by quite a bit.
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