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re: Tyre Pressures????
Posted: Fri May 06, 2005 9:57 pm
by Blackzxr
Re: Tyre Pressures????
Posted: Tue Jun 21, 2005 9:20 pm
by Androo
Yankee wrote:all this talk of pressure gauges......
well, i'm gunna go get one of those gauges ya'll been speakin' about, so what pressures are best front and rear, cold and hot, zx6 versus zx9 vs. zx12, etc.....
I could just go with what the book says (F= 36psi R=41psi COLD)
do that, or you'll burn through tyres in no time
Posted: Thu Jul 14, 2005 8:03 pm
by the kid
OK , sorry to bring this back to the top again but , what the hell its an important debate . What are pilot sports as aposed to pilot powers . I know they have race and road . Do we mean Pilot Power Sports ? I have a new set of pi pow etc etc , not race on a zx9 and 38f 42r but maybe they could drop a bit ? AND coz we dont trust the servo gauge who could suggest a top gauge to carry . My last one (vdo , came in a leather case etc was stolen outa my car and not made any more
)
Posted: Thu Jul 14, 2005 9:00 pm
by Neka79
ok..now ive done a few rides on the pilot power road version...
front- 36
rear- 40
this is on a 162kg 929cc fireblade with a 70kg rider...
i dropped the pressure to 28psi (front & rear) on the track- but they were BT012's
i use a digital guage i picked up from a dealer for $40
Posted: Thu Jul 14, 2005 9:12 pm
by Nanna10r
Bill the Michilin Pilots came in various models. I think it went Road, Sport, Race, Powers. In order of stickiness from hard to soft.
Good chance I'm wrong here though, maybe someone has the definate answer.
As for pressures it really does depend on lots of different things. General rules seem to be;
have a couple more psi in the back tyre
dont let either of them go under 30psi unless your doing trackwork.
hth.
Cheers Brett
Posted: Thu Jul 14, 2005 9:54 pm
by Barrabob
it goes road,sports,powers,race the race ones have a pointier profile and need a good bit of heat in them apparently, the sports ones they dont make anymore and they go off pretty quick if you are getting into it a bit, they get a greasy feeling to them.
Powers are the ones to use on the road on a sports bike they seem to wear well and grip well. I use 34/36r pressures on the road and it suits me fine have got 6000kms out of a rear including track days.
Your mad if you dont get a tyre gauge and keep it under the seat of your bike they are cheap and at least you know what you put in your own tyres even if your gauge is out a bit.
Posted: Sat Jul 16, 2005 1:23 am
by HemiDuty
neka79 wrote:ok..now ive done a few rides on the pilot power road version...
front- 36
rear- 40
this is on a 162kg 929cc fireblade with a 70kg rider...
i dropped the pressure to 28psi (front & rear) on the track- but they were BT012's
i use a digital guage i picked up from a dealer for $40
This Blade just keeps getting lighter and lighter........
Anyway I used to run about 32 front n rear in the Diablo Corsas I used to have on the 7 (track riding BTW, got no advice for the road unfortunately), and whilst not exactly slippery they did spin up when pushed outa corners, and the thing got real tail-waggery when downshifting under brakes too. But when the Bridgestone soft compound race slicks went on I ran the pressure at 27 front n rear and it is way stickier. Less stable too, but meh - its all good for the track. So I guess if ya want to keep some stability then do not go too low on pressures.
Posted: Sat Jul 16, 2005 1:38 am
by Barrabob
That instability is probably from running pointy tyres they have had the sides carved off them by an expert and the slicks have a pointy profile to start with.
Its all good though it probably turns in way quicker on the brakes.
I have half a set of slicks i found a good front but cant fit a 190 on the back because it wont fit inside the swingarm....you may see me at the next race meeting where theres 600s looking for a worn rear tyre.
Posted: Sat Jul 16, 2005 9:52 am
by aardvark
HemiDuty wrote:neka79 wrote:this is on a 162kg 929cc fireblade with a 70kg rider...
This Blade just keeps getting lighter and lighter........
Doesn't it!! According to here:
http://www.motorbikes24.de/16094+M5993e329100.html
here:
http://www.biketome.com/bikes:honda:cbr ... blade:2001
and here:
http://www.bikez.com/motorcycles/honda_ ... e_2001.php
It's 170kg. Dry!!
162Kg. Come on Neka. Wake up. It's a big fat pig of a Honda for crying out loud.
Posted: Sat Jul 16, 2005 10:21 am
by Jonno
Tyre pressures hmmm, for street open road riding the 10% / 20% rule is the best I have heard and I have used.
(but need to do it again and it is a nice day out, good excuse).
Check and record the tyre pressure when the tyre is cold, take a 30 minute blast down a good bit of road preferably twisties to get your tyre temp' up, then measure the tyre pressure immediately after stopping. If the pressure has risen less than 10% on the front or less than 20% on the rear, you should remove air from the tyre (to increase heating affect of carcass flex). I then check the tyre pressure again while cold and record it for future reference
Each application is different so I reckon this should work ok. Just a suggestion HTH
Posted: Mon Jul 18, 2005 1:06 pm
by chrjonzx9r
Yeah scotty, that is pretty close to the truth about all tyres. You can use the same principle on your car too. As a engineer at qantas we went into the principles/theory/calculations etc of this topic.
Put in the "factory Pressures" when the tyre is cold and the bike/car is on flat ground. Then take it for a ride for roughly 15-20mins (for the car i always do 15 minutes at 100km/h) getting some heat into the tyre. The theory is that because air expand when heated that if you had 42psi in the tyre and went for the ride and it climbed to 50psi while hot that there is too much air in the tyre. The rule is that the pressure should not rise more than 4 psi from cold to hot. This keeps your tyre in the correct shape and you wont wear your tyre from over pressuring.
The same principle applies if your pressure drops, this is because the tyre also expands slightly from temp however the air doesnt as much. This cause your tyre pressure to drop... causing underinflated wear.
So basics are, measure, ride, measure and if it increases more than 4 psi than let some air out. Try again.
Posted: Mon Jul 18, 2005 5:37 pm
by Phil
Posted: Mon Jul 18, 2005 6:47 pm
by Damon Z1000
Michelin Pilot Powers, 36 Front, 41 rear and as sweet as a nut.
p.s. rear known to be as flat as a pancake on the odd occasion at Madkaws place
Posted: Mon Jul 18, 2005 7:12 pm
by Neka79
ok..well its nice they over inflate the HP..i kno the rwhp on my bike is 138 running PULP...also kno that STOCK they are 170kg dry...by the time u cut out bits & pieces here, take off this and that, i trimmed a few kg off it...
162kg was just a random number,fark sum of u guys take things so bloody anally!!...
Posted: Tue Jul 19, 2005 12:53 am
by HemiDuty
neka79 wrote:ok..well its nice they over inflate the HP..i kno the rwhp on my bike is 138 running PULP...also kno that STOCK they are 170kg dry...by the time u cut out bits & pieces here, take off this and that, i trimmed a few kg off it...
162kg was just a random number,fark sum of u guys take things so bloody anally!!...
It's just that within days it had gone from 164 to 162. I thought ya musta let some air out of the tyres
.......and neka - if your in any doubt get jamie to pull the test out i spoke to him about a couple of weeks ago, he'll know the one 