pdb1964
Zone Head
Posts: 536
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posted May 20, 2004 06:07 PM
What a difference 10 psi makes!!!
I guess I should of never assumed that the dealers put the right amount of air in the tires. I also should of checked pressure more often, and from now on, I will.
A few days ago, I decided to check the pressure. Thought the tires felt a little soft when I pressed against it. They were both at 30 psi instead of 42. Pumped them up to the right pressure and then went for a short ride. Even though it was around town and there were no high speed stuff, the bike felt 100 lbs lighter. It was so much easier to turn in and was now balanced once in the turn.
Today, I went for a two hour ride, at a quicker pace then before. I also had a passenger. Man, was like a new bike. A lot more stable, more feedback, a blast to ride. Don't know how I was riding it before. From now on, I'll be checking tire pressures.
  
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tuusinii
Pro
Posts: 1031
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posted May 21, 2004 01:26 AM
Yeah it's surprising that dealers don't check basic things. Other thing that's commonly wrong is the throthle cabel adjustment. And Yes the tire pressures are very important so You should check them periodiclally.
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TurboBlew
Moderator
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posted May 21, 2004 02:41 AM
42lbs???? Guess you dont put a lot of heat to your tires.... do you?
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EastBayDave
Needs a job
Posts: 2245
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posted May 21, 2004 05:16 AM
Dunlop says 30psi from & rear one-up for track/twisties...
The higher pressures are for heavy loads (2-up)....
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Enjoy the ride!
02' ZRX1200
00' ZX12R sold
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EastBayDave
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Posts: 2245
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posted May 21, 2004 05:17 AM
 Edited By: EastBayDave on 21 May 2004 06:17
Dunlop says 30psi front & rear one-up for track/twisties...
The higher pressures are for heavy loads (2-up)....
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Enjoy the ride!
02' ZRX1200
00' ZX12R sold
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supraman95mb
Expert Class
Posts: 212
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posted May 21, 2004 07:51 AM
Yeah I run 31psi rear and 33psi front.
You can definatlely feel the difference I agree!! However I need it for the twisties.
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Michael Lee
Zone Head
Purchase Ivy
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posted May 21, 2004 07:58 AM
IS THERE A GOOD PRESSURE FOR DYNO RUNS?
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pdb1964
Zone Head
Posts: 536
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posted May 21, 2004 08:36 AM
You're right Dave. I looked at the manual and 42 psi is for max load (401 lbs, rider, pax, baggage). I was at about 300lbs (Danielle and I) so still too much pressure I guess. I just didn't like it at 30 psi. I think I'll try 35 psi (with just myself on, 180 lbs) and see how that feels.
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pdb1964
Zone Head
Posts: 536
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posted May 21, 2004 08:37 AM
Oh, and I run Michelin HPX's
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EastBayDave
Needs a job
Posts: 2245
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posted May 21, 2004 04:29 PM
yep, a higher pressure might be right for you. I really don't know Michelin's anymore since I left the M45/PZ2 combo back in 1977'...:P
A Busa riding buddy runs Michelin's track/street at 32f/34r & he loves it...He goes way, way too fast on the street....phking maniac! Last time I rode w/this guy I was thinking all day...."here comes a ticket"....
Somehow didn't see a CHiPpie all day...
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Enjoy the ride!
02' ZRX1200
00' ZX12R sold
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pdb1964
Zone Head
Posts: 536
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posted May 21, 2004 09:20 PM
I ran 35/35 today but it wasn't any hard riding except for a few turns. went to check out some boots. Thinking of getting the AlpineStar GPS 3. But I'll keep in mind that when I do go ride hard that I might reduce the pressure some.
Out of curiousity, has anyone read the tire pressure when cold, then after a spirited ride when the tires are heated up, to compare?
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beansbaxter
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posted May 21, 2004 09:28 PM
What should the tire pressure be for stock sizes BT010's on my 12????
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TurboBlew
Moderator
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posted May 21, 2004 09:53 PM
Pressures rise about 5psi when the tire is up to temp vs being cold.
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WarpSpeed
Parking Attendant
Posts: 10
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posted May 24, 2004 05:12 PM
10 pounds low? My 12 was delivered with 55 pounds, front and rear! Talk about a squirrely first ride..
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Hells Dark Lord
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living life, and loving it.
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posted May 25, 2004 01:49 AM
Beans I would start with about 35 PSI in those and work my way down or up until I found a food air pressure for me, I ride a lot of twisities, so I tend to run a lower pressure. The first ride up in the Cherohola this DGevent I was running 30/30, it was a bit to soft, I coulndt heat them up like I do on the track, so I upped it to 33/34 and was very happy with that. But I am running Supercorsas too, so it will vary from tire to tire, and riding style to ride style.....just change it in 1 or 2 pound increments until you find what feels best, but I would go lower than 30 on the street, or over 36.....JMO
If you ride 2 up, then you might go up to 38, possibly 40....on straight roads....
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Zaphod Breeblebox
Expert Class
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posted May 25, 2004 09:51 AM
quote:
What should the tire pressure be for stock sizes BT010's on my 12????
Beans, I use a BT010 rear and a BT011F front. For my daily commute or for runs that will tend more towards high speeds and long distances (rather than scratching) I'll run 39-40 lbs, front & rear. For track days in warm weather I run 35 front, 34 rear. For cold weather track days, I'll run a couple of pounds less. I did run 30 pounds in the front on one very cold track day, but that just didn't seem to be enough....seems like the front end felt very squirrelly.
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Zaphod
Y2K ZX-12R
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Zaphod Breeblebox
Expert Class
Posts: 117
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posted May 25, 2004 09:54 AM
quote:
Pressures rise about 5psi when the tire is up to temp vs being cold.
I've heard it that way, and I've also been told that pressures will rise about 8% - 10%...this would work out to a bit less than 5psi.
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Zaphod
Y2K ZX-12R
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Zaphod Breeblebox
Expert Class
Posts: 117
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posted May 25, 2004 09:57 AM
quote:
10 pounds low? My 12 was delivered with 55 pounds, front and rear! Talk about a squirrely first ride..
That's the way mine was, too! Felt like I was riding on a tightrope!
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Zaphod
Y2K ZX-12R
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fish_antlers
Administrator
The Truth is Out There
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posted May 25, 2004 10:04 AM
track 30 f 30 rear
street 34 f 36 rear
that's my preference.... just personal.
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zx12richard
Pro
The Green Monster..
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posted May 25, 2004 11:07 AM
Hot temp pressure is whats important.... Cold temp is a baseline for adjusting you hot tire pressures...
We used to get this question alot when I worked doing Pirellis at the tracks... And the answer never changes...
What tire pressures do you suggest???? Don't know about others but Pirellis for example are designed to perform best with 34 to 36 hot temp psi.
So we baseline them at 31 front and 30 rear and tell them to adjust the pressure accordingly.. If you come in with hot tires and pressue is 33 front and 32 rear then go up a couple pounds in front and 3 in the rear cold pressure.
Goal is 34 to 36 psi hot temp period that never changes on Pirellis...
And thats race tires I am speaking of... And this info was told to me from a man doing tires a lonnnnng time.... Also taught me how to double bead a front tire... One spin of the tire deck and both beads on....
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Hells Dark Lord
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posted May 25, 2004 03:57 PM
good point Richard....and the tire carcas an dconstrustion means varys from tire to tire,and tires styles....Race tires have very soft sidewalls and are therfor more suseptable to tire pressure differences than say a standard street tire....and a sport touring tires even more rigid in the sidewalls and compounds....When you drop air pressures in a tire you tend to raise the heat built up in the tire due to the frictions of the tire flex. Thusly with a more rigid sidwall the less flex, an the less heat that is built in that tire. Keep in mind as well that the streeet tires are designed to run at a much more moderate temp than the race tires. that is why its very hard to vulcanize the rubber in a standard street tire. (Vulcanizing turns the rubber blue on the outsides of the tires.)
So what it all boils down to is finding a pressure that works for you and makes the tires do what you want them to do. Richard makes a good point....36 PSI is probably the best all around pressure you can run....remember that is a HOT pressure....check your pressure hot and set it at 36 and see how it feels...adjust from there....until it feels right to you....too much pressure will make the tire give you next to no feedback, and to little will get all squirilly....
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When in doubt, lean farther and go faster....
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pdb1964
Zone Head
Posts: 536
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posted May 25, 2004 09:11 PM
This is great. Lots of info. I guess it is a matter of adjusting the tire pressures to the type of riding that you are about to do. A bit higher pressure for day to day stuff and then lower the pressures when you are going out to have some fun in the twisties.
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