Paul prinzo Posted June 21, 2020 Share Posted June 21, 2020 Can I run lower pressures in my 11x24’s to try and smooth the ride out in my DM800 tractor ? Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/ Share on other sites More sharing options...
JoeH Posted June 21, 2020 Share Posted June 21, 2020 What weight are you running? In general you fill tires up to what the door jam stickers say, not necessarily what the tires say. If you're always running empty on a hobby truck then yeah, cut the camelbacks down to 50-60 psi Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453853 Share on other sites More sharing options...
Ditchdiggerjcf Posted June 21, 2020 Share Posted June 21, 2020 8 hours ago, Paul prinzo said: Can I run lower pressures in my 11x24’s to try and smooth the ride out in my DM800 tractor ? You sound like a man that should be rocking a freightshaker. Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453855 Share on other sites More sharing options...
Quickfarms Posted June 21, 2020 Share Posted June 21, 2020 They are tube tires. If you air them down to far you could cause tube creep and shear a valve stem off If the tires are old I do not air them down, sidewall flex will destroy old tires. Personally I do not air the tires down, I add air ride seats, air ride cab, air ride suspension or rebuild the springs Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453858 Share on other sites More sharing options...
david wild Posted June 22, 2020 Share Posted June 22, 2020 DM 800 is supposed to ride rough 1 Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453870 Share on other sites More sharing options...
Ditchdiggerjcf Posted June 22, 2020 Share Posted June 22, 2020 2 hours ago, david wild said: DM 800 is supposed to ride rough Ding, ding, ding.... Winner, winner, chicken dinner Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453880 Share on other sites More sharing options...
h67st Posted June 22, 2020 Share Posted June 22, 2020 21 hours ago, Quickfarms said: They are tube tires. If you air them down to far you could cause tube creep and shear a valve stem off If the tires are old I do not air them down, sidewall flex will destroy old tires. Personally I do not air the tires down, I add air ride seats, air ride cab, air ride suspension or rebuild the springs Do you have an idea what would be a minimum pressure for tube type? Mine are 10:00-20. I'll be bobtail most of the time (hobby truck). Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453906 Share on other sites More sharing options...
mrsmackpaul Posted June 22, 2020 Share Posted June 22, 2020 50 psi As long as the tyre wall isnt flexing to much If the wall flexes to much the tube will scuff on the wall and cause the tube to rub thru A lot of people run 10.00's at 60 - 65 on hobbie type trucks but I think even 50 would be fine Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453908 Share on other sites More sharing options...
Paul prinzo Posted June 22, 2020 Author Share Posted June 22, 2020 This is a hobby truck, just wanted to do everything possible to smooth it out, cause you know we have the best roads here in Jersey Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-453921 Share on other sites More sharing options...
Vladislav Posted June 24, 2020 Share Posted June 24, 2020 On 6/23/2020 at 1:59 AM, Paul prinzo said: This is a hobby truck, just wanted to do everything possible to smooth it out, cause you know we have the best roads here in Jersey Ha-ha-ha I posted this below pic a few years ago when asked a question on the same matter. Dropped the pressure down to 2,5 bar in the rears (don't remember how many psi) and got much happier. But the wheels were 11R24.5 tubeless. 1 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454066 Share on other sites More sharing options...
h67st Posted June 29, 2020 Share Posted June 29, 2020 On 6/24/2020 at 4:21 PM, Vladislav said: Ha-ha-ha I posted this below pic a few years ago when asked a question on the same matter. Dropped the pressure down to 2,5 bar in the rears (don't remember how many psi) and got much happier. But the wheels were 11R24.5 tubeless. Rough looking road! 2.5 bar is 36 psi. Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454383 Share on other sites More sharing options...
Swishy Posted June 29, 2020 Share Posted June 29, 2020 rule of thumb we use ..... ruffly half the bar added to the bar x10 2.5 + half x 10 2.5 + 1.25 = 3.75 x 10 = 37.5psi cya 1 Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454414 Share on other sites More sharing options...
HarryS Posted June 29, 2020 Share Posted June 29, 2020 Thanks for posting the conversion formula. I was going nuts trying to figure it out. Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454426 Share on other sites More sharing options...
steelman Posted June 29, 2020 Share Posted June 29, 2020 A bar is one barometric pressure, which at sea level is 14.7 psi. To convert bar to psi, you simply multiply 14.7 times the bar number. Therefor (2.5) x (14.7)= 36.75 psi. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454432 Share on other sites More sharing options...
Vladislav Posted June 29, 2020 Share Posted June 29, 2020 18 hours ago, h67st said: Rough looking road! 2.5 bar is 36 psi. That trip I covered nearly 40 kilometers of that dirt road. It took me one and a half hour plus a 10 minutes relaxing stop. Rears were inflated to 4 bar/59psi and the truck was really shaky. Fronts were 6bar/88psi. Having that pressure I noted rear tyre's shoulder areas didn't touch pavement when you're on a highway keeping dust on. After home I deflated rears to the pointed above 2.5 bar/37 psi and felt much better with tyres making contact by full width. Was going to drop off more down to 2 bar/ 30 psi but just didn't do that. Cars drive with 2 bars in tyres but car's rim has humps for better sidewall lock and truck whells don't. Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454434 Share on other sites More sharing options...
JoeH Posted July 2, 2020 Share Posted July 2, 2020 (edited) On 6/29/2020 at 3:48 AM, Swishy said: rule of thumb we use ..... ruffly half the bar added to the bar x10 2.5 + half x 10 2.5 + 1.25 = 3.75 x 10 = 37.5psi cya So yer sayin it's bar x 15 2.5 x 15 = 37.5 Edited July 2, 2020 by JoeH Quote Link to comment https://www.bigmacktrucks.com/topic/62988-tire-pressures/#findComment-454690 Share on other sites More sharing options...
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