tire pressure??

[bigwake]

ok so i'm about 6'1 255...i just got an 03 yz450f..the reccomended tire pressure is 15 psi...where i ride its tricky because it is extreme conditions both ways..half my riding is in soft packed dirt/sand..and the other half of my riding is on pure hard gravel roads...what should i do?..my suspension is all stock and set about 4 inches of sag.. any help? thanx-josh..p.s...i know i should switch my spring to a heavy one..but i can't afford to put anymore money into the bike..

[kawirider6080]

on the x games last night they said you really dont even need to worry about tire pressure with a 4 stroke. they get traction pretty much everywhere.

[bigwake]

i heard RC say that as well..thats wut sparked me to ask this question ,..bcuz as u knos..hes a small dude..the opposite of me..so i didnt know about bigger guys..thanx

[NYKTM]

I can say I have less than 9 in the front and about 6 in the rear, I can feel the tire collapsing at higher speed and it feels like a flat so a target pressure would be about 11 I think, 15 is too much to be competative

[bigwake]

ya..i picked in between..i went with 12..so i'll see how it rides tomorrow

[flintlock28]

The "Rim Clean" method is the most accurate way of determining pressure. Remember, your pressure can be different on your bike, depending on if you use a standard tube, heavy-duty tube, or extra-heavy duty tube.

To use the "Rim Clean" method, make sure your rims are clean before riding. Go out and ride for awhile at what you think might be a "ball-park" figure..let's just say 12 p.s.i. for both the front and the rear.

After riding for awhile, (make sure there's some dirt/dust on the rims) look at your rims where the tire meets the rim, and you should see a strip of rim that has been "cleaned"....i.e. you'll see where the tire has actually rubbed off some of the dirt/dust. Measure this "clean" strip, and it should be right around 4mm in width. If there is no strip; than your pressure is too high, and needs to be reduced. If the clean strip is more than 4mm, than you are too low in pressure. All off-road tires are designed to "roll-over" the rim slightly. This is what gives the most accurate method of tire pressure.

[bigwake]

sweet! im gonna deffinately check that from now on! thanx

[aytheist1]

I learned something handy today, thx!

[Jim Hale]

I ride similar varied terrain... dirt/mud/sand that can turn into baseball size rocks. I use to go down to 12psi but because of the rocks I've found 15psi handles both pretty well, plus I can ride home on it. I'm using the Dunlop 606's.?

[bigwake]

o ya!..these rocks by me are much larger than baseballs..and my bud flew past me on his kx250...lets just say i cheated getting my face bashed in by one of those sukkers..it was like a baseball and a half..it just came off his tire like nothing! never seen anything like it before!

[Dwight_Rudder]

12 psi on modern bikes in normal conditions. If wet I go down to about 10 rear and 11psi front.

Dwight

[bigwake]

ok so i should be just fine..i always ride in the dry stuff..no water for me! thanx for the help!

[Denn10]

When you know your gonna ride different terrains set your tires for the worst, like sandy desert with hard pack and rocks set your tires for the hard pack n rocks cuz you definitely need to do what you can to prevent a flat. I have a spring I KNOW you say you dont have money but im not gonna sell for alot. If your wrenching a stock spring down that much to get your sag correct it will affect your whole shock alot. call me if your interested its a 5.4 and i think stock is like 5.1 or 5.2 Dennis 760-792-9398

[12-YAMAHA-12]

my dads 05 yz450f has sand tires and me ride on sand mud and lime rock. It runs around 8 to 10 psi in both.