locogato11283 Posted March 14, 2009 Report Share Posted March 14, 2009 in the "best hooking tire thread" RagunCajun had mentioned that his cut knarlys didnt hook for shit. i made the comment that they looked to have a lot of air in them. he replied back that he was runnin about 6 PSI in them.. so, i decided to go out and see what the difference is between 6 PSI and 1 PSI, which i run at my hillclimbs.. i started with 6 PSI in the tire with my 180 pound ass standing on top of it and then my 1 PSI tire. i set my 10 second timer to capture the results.. notice in the first picture at 6 PSI. it doesnt even look like there could be any weight on the tire. you can still see light under it. while the cut out row still allows the tire to drop down to get more bite from the next lug, the tire itself with not flex much if at all. youve got 2 rows of lugs touching and nothing in between. now notice the picture at 1 PSI. youve got 3 rows of lugs touching as well as 2 spaces in between. the more tire that is touching the ground, the more traction youre going to have. also, which cannot be shown by these pictures is the rotational force that your bike will have on the tires. i used to have a picture showing what the rotational force would do to a tire at 1 PSI. they will almost fold on themself. the low PSI combined with the rotation, makes the tire hook 10x harder than it would at 6 PSI. any questions? 6 PSI 1 PSI Quote Link to comment Share on other sites More sharing options...
Powerstroke Posted March 14, 2009 Report Share Posted March 14, 2009 Loco do you have to run beadlocks to get away with running that low of pressure? Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted March 14, 2009 Author Report Share Posted March 14, 2009 Loco do you have to run beadlocks to get away with running that low of pressure? nope. i run douglas .160 aluminum rims. ive run them as low as 1/2 PSI and never spun one. Quote Link to comment Share on other sites More sharing options...
Powerstroke Posted March 14, 2009 Report Share Posted March 14, 2009 nope. i run douglas .160 aluminum rims. ive run them as low as 1/2 PSI and never spun one. Good stuff. Off to the shop to let the air out of my tires. Quote Link to comment Share on other sites More sharing options...
Dinner Posted March 14, 2009 Report Share Posted March 14, 2009 Interesting read Tyler. It does make sense, hell maybe I should go lower mine from 6 to like 3, even that would make a difference (mine aren't cut). Quote Link to comment Share on other sites More sharing options...
sandman81 Posted March 14, 2009 Report Share Posted March 14, 2009 also, which cannot be shown by these pictures is the rotational force that your bike will have on the tires. i used to have a picture showing what the rotational force would do to a tire at 1 PSI. they will almost fold on themself. the low PSI combined with the rotation, makes the tire hook 10x harder than it would at 6 PSI. that's cool to show the tire contact. :thumbsup: rotational spin of drag car tire, same concept. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted March 14, 2009 Author Report Share Posted March 14, 2009 Interesting read Tyler. It does make sense, hell maybe I should go lower mine from 6 to like 3, even that would make a difference (mine aren't cut). it absolutely will. i dont know why anyone would run 6 PSI in atv tires. the most i ever run in 3 in my 450 tires. the thing about the knarlys is that the lugs are stiffer than most other dirt tires. to get the max traction uncut, you gotta get the PSI way down in them. sandman, thats the same type of picture i have somewhere.. its a pic of my brother at a hillclimb shot by a photographer. the tire looks the same way. hes hard on the throttle and getting excellent traction. Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted March 14, 2009 Report Share Posted March 14, 2009 We run around 2.5-3 psi in the paddle tires and dont have bead issues on douglas .125 rims. Quote Link to comment Share on other sites More sharing options...
flyhighprerunner Posted March 14, 2009 Report Share Posted March 14, 2009 I use to have a picture of a tire that a photographer at planet sand took, it shows a tire that de-beaded itself from the wheel under the launch it was a pretty cool picture....Good post Tyler Quote Link to comment Share on other sites More sharing options...
LS1Inferno Posted March 14, 2009 Report Share Posted March 14, 2009 at that pressure you realy dont need to worry about spining it. if poped plenty of tires off the bead riding. it mosly in sideways conditions. Quote Link to comment Share on other sites More sharing options...
peterlocal22 Posted March 14, 2009 Report Share Posted March 14, 2009 loco great test im def. going to lower my pressure thanks peter Quote Link to comment Share on other sites More sharing options...
SandRageShee Posted March 14, 2009 Report Share Posted March 14, 2009 i usually run my razrs at about 2 psi.. only managed to pop it off the bead once...during a wreck LOL.. Quote Link to comment Share on other sites More sharing options...
BansheeRider87 Posted March 14, 2009 Report Share Posted March 14, 2009 Tyler what about tire wear, since running less air, getting more surface area of tire, wouldnt wear out the tire faster? I saw someones sig, hes riding mx and his tires look almost flat. Hes on a red shee givin the finger with a hat on i think Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted March 14, 2009 Author Report Share Posted March 14, 2009 Tyler what about tire wear, since running less air, getting more surface area of tire, wouldnt wear out the tire faster? I saw someones sig, hes riding mx and his tires look almost flat. Hes on a red shee givin the finger with a hat on i think the last set of knarlys i had lasted me 4 years on the hills, testing, etc.. i really wouldnt recommend running 1 PSI for trail applications. i would stick to 2-4 for that. i probably run the tires on my 450 at 3 or 4 when im out jackin around on it. Quote Link to comment Share on other sites More sharing options...
shanYE west Posted March 14, 2009 Report Share Posted March 14, 2009 I use 1.5-2lbs in my paddles. Same concept. 6lbs is definately over inflated... that would spin like a mofo for sure. Quote Link to comment Share on other sites More sharing options...
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