- This topic has 29 replies, 9 voices, and was last updated 14 years, 2 months ago by eternal05.
Kawa. 250r + long distance + heat = tyre pressure?
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February 2, 2010 at 3:22 am #24345MunchParticipant
As for the comment…yes I misunderstood…. and though the size of the tire is to accomplish a certain look it still does not change the fact that tire pressures are varying with application, make, and various other things.
February 2, 2010 at 3:29 am #24346MunchParticipantIts funny that you post that as I work for Bridgestone/Firestone. Ever been to one…..ever wonder why no corporate stores carry the nitro fill system? It’s more or less a crap deal. All of that article is true only if you put the tire under a full vacuum after mounting the tire to the rim and back filling it with the nitrogen air.
Not only that but the first time you change the pressure at any location that does not have nitrofil tanks (usually at a cost of near $3 a tire) it became a moot point. Not to mention especially in MC applications….the tire is not on the bike long enough to become a fact for the contained air to cause “rust and corrosion”. Usually its from amateur mounting/dismounting practices that gouge or cut the protective finishes on the rim off.BUT…..I am not an official spokes person and do not speak for Brdigestone/Firestone
February 2, 2010 at 8:17 am #24353eternal05ParticipantThe first posts in this thread had all the information he needed: check with the manufacturer.
He specifically said that his tires are listed as having maximum pressures of 32/36 psi front/rear, so why on earth would you suggest he run 33/36 psi? Your Yamaha (if stock) runs a 160mm rear. The 250R runs a mere 120mm rear. Different profile, different tire style, etc.
Here it is, handed down from the Gods themselves (i.e., Ninja 250R manual):
Recommended COLD tire pressures (front/rear): 28/32 psi
Paul, if you’re running tires other than the stock tires, or if you have an older gen Ninja, you’re going to have to check with the source. Otherwise, there’s your answer.
February 2, 2010 at 11:44 am #24354MunchParticipantNow what’s the point in not getting complicated? Some of your best information is found through debate and discussion. :^P I am sure Paul found his answer 6 paragraphs ago. If we all kept the answers so simple….. well…..the forum would be boring and un informative and more like taking the SAT’s.
February 2, 2010 at 10:50 pm #24357Gary856Participantwell, if the OP asked, “what does a Ninja 250R manual recommend”, then I’d reply, “check your manual” and be done with that. But I thought he wanted more opinions…
He specifically said that his tires are listed as having maximum pressures of 32/36 psi front/rear, but I’ll bet you those are recommended pressures (from somewhere), NOT the max pressure molded on the sidewall of the tires.
I’ve searched model specific forums on different bikes on the subject of tire pressure. For the same bike, people vary their tire pressures from what the manual recommends quite a bit, for whatever their presonal reasons/preferences. The great majority seem to settle on 33/36 (close enough to the 32/36 in the OP, that was the point), so I said it was a middle ground, give or take a few psi. I didn’t say that was the law. The point of all this is to explain that up/down a few psi is within the margin of what people do to suit their own needs, so it’s not a one-size fit all answer some people seem to be thinking.
By the way, my Yamaha does not have stock size fron or rear (now it’s 120/180), and my GS500 has 110/130 tires, my SV650 has 120/160, but I still run 33/36 on them all, and it’s just fine. Could I run 30/33, or 36/39? I could, if I have a specific reason to.
February 3, 2010 at 1:59 am #24362eternal05ParticipantBy no means am I saying we shouldn’t debate things…or I’d be a huge hypocrite. I’m just saying, tire pressure is one of those super annoying debates because almost nobody knows what they’re talking about (I certainly don’t), having gotten all their information from their peers, who also don’t know what they’re talking about.
Everybody seems to have an opinion. On the one hand, some people insist that having the wrong tire pressure by 1-2 psi is terrible, and others argue that there’s a big range where it’s just a matter of personal preference. But NOBODY agrees! Unlike other discussions, non-experts (most of us, except for Mr. Bridgestone employee over there ) almost never have any concrete evidence for their positions. It’s just vanilla vs. chocolate, cruiser vs. sportbike, Fender vs. Gibson, etc. with one major difference: one of the sides IS right, but nobody knows enough to figure it out.
That’s why I just tell people to use the manufacturer’s suggestion
February 9, 2010 at 6:27 pm #24476WetmelonParticipant“.if you dont have that . . just trust the side wall.”
Tru dat, homes.
February 10, 2010 at 12:38 am #24487MunchParticipantActually …don’t!….. the pressures on the sidewall is max…. meaning all they recommend that the tire can safely hold ….. add pot holes and other such impacts and you put yourself in a hard position. Think of your tire as a balloon, full it slam full of air and the clap it with your hands. Did it pop? If your tires are already at max pressure (which yes I am aware they understate it intentionally) and hit an impact…. that pressure has to go somewhere and if there is no more expansion room left in the or around the tire itself…….. guess where is left…. OUT.
Some companies play it safe and under rate the pressure, thats to help keep the mis informed “safe” , however they cannot compensate for the rate at which an impact can/will hit a tire if over inflated.
I know in other forums there are statements of better performance at higher pressures. Let them be the guinea pigs. And also make sure of what tire they are using the higher pressures in. Not all tires are created equal!February 11, 2010 at 4:17 am #24516Gary856Participant– Pressure molded on sidewall shows max pressure for max load. Each of my 3 bikes, 6 tires (a pair of Dunlop, a pair of Perilli, a pair of Bridgestone) shows “max load xxx lbs at 42 psi” on the tire sidewall. However, since the bikes are not normally carrying max load, especially the front, 42 psi is not the “recommended” pressure for the “actual” load. Generally, as you increase pressure, you loose traction, and gain gas mileage.
– On the left-rear swing arm of each of my bike, there’s a factory sticker showing tire size and recommended pressure. You probably have it on yours.
– I disagree that a tire would pop when impacted at rated max load pressure; that’s a law suit for the tire mfr. They’re rated to take the max impact at max pressure. In fact, for two-up riding, one of my bikes says to go up to 42 psi rear, another says 41 psi rear, another says stay at 36 psi rear.
– With new cars, during transportation and storage, the tires are “super-inflated” way pass the max pressure on the sidewall to prevent the tire rubber from taking a set (permanent deformation) from sitting around in the same position for a long time.
February 11, 2010 at 5:31 am #24517MunchParticipant“- With new cars, during transportation and storage, the tires are “super-inflated” way pass the max pressure on the sidewall to prevent the tire rubber from taking a set (permanent deformation) from sitting around in the same position for a long time.”
….no load…no heat build up and no impacts. In fact those very tires are only expected to last at best 30K miles. Ask your dealer why there is no warranty (without purchase) of tires on new vehicles. They are not designed to last, they are only designed to snag you as a customer for the comfort and quiet that you get initially and with a safe performance. However not on a mileage aspect. However a car tire is a poor example in relation to motorcycle tires as the demands and structure and compounds are very different.
“- I disagree that a tire would pop when impacted at rated max load pressure; that’s a law suit for the tire mfr. ” …… counter point… the reason for stamping that their is to CTOA! At any given time a point of failure happens and they can find a way to prove you’ve exceeded their recommended pressures…. end game.
I can go on all day about tires as that is my job and business. However like most things in life it is highly debated and beat into the ground. I work in the industry and see the results from real life and not media coverage or lab tests. My only recommendation is to follow your MoM and use common sense when choosing both your tire (make/tread purpose/speed rating/load rating etc. ) and your air pressures. If you decide to deviate from those (as I myself have) make sure you dig into real life, real practice examples to help you decide.
February 11, 2010 at 6:51 am #24518eonParticipantWhatever happened to Paul?
He went on this trip some time ago. Did his tires pop and leave him stranded on a Chilean road in the middle of nowhere? We want to know!February 11, 2010 at 10:46 am #24519MunchParticipant….tune in same bat channel…..?
February 12, 2010 at 6:57 am #24525eonParticipantMy vote he met a Chilean Chica and is now setting up a business importing bowler hats from England for the locals. Only Englishman and Inca women wear such silly hats (and apparently, most of the wild west cowboys back in the day. the things you learn from wikipedia)
February 16, 2010 at 12:42 am #24428owlieParticipantHmm… Do you think that they make Snell approved bowler hats?
February 18, 2010 at 6:27 am #24574eternal05ParticipantBut they only protect from spherical anvil hits and food-borne illness.
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