 | Home > Maintenance & Modifications > Tyre pressure |
 
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| Timo Member Since: 14 Jul 2011 Location: Peterborough Ontario Posts: 171   
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Hi all
I just got a set of BGF All terrain T/A ko in 238/85 R16. The tire shop installed them and has them all at 60psi when I picked them up. This seems a bit high, although the max psi says 80 on the sidewall, any insight is appreciated? Thanks T_ Series II in pieces 1984 Defender 110 (3.5l V8 now 300TDI) |
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3rd May 2012 1:06pm |
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| MartinK Member Since: 02 Mar 2011 Location: Silverdale (Lancashire/Cumbria Border) Posts: 2664  
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I usually run 30 psi in the fronts (recommended in the manual)
36 psi unloaded or 40psi loaded in the rears (manual says 38psi unladen, and up to 65psi fully-laden). Any more (than 38psi) and the ride quality becomes (in mine at least) too bouncy. Go too low, and your fuel consumption will suffer... You may want less pressure for offroading. Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's) |
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3rd May 2012 1:10pm |
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| TR51 Member Since: 17 Apr 2012 Location: Dorset UK Posts: 333  
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I run 32psi in the front and 40psi in the rear (takes into account the extra kit carried).
Tyre center did the same when my 265 BFG AT's went on but a friend told me about the chalk test... See http://www.ehow.com/how_6948382_chalk-tires.html for a page describing it. Ensures your tires are exactly correct for the equipment you carry  |
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3rd May 2012 1:51pm |
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| bm52 Member Since: 04 Apr 2010 Location: Kent Posts: 2189 
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i have the same tyres on my 90. 30 front and currently 38 lightly laden on the rear BM52
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3rd May 2012 2:35pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2615  
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Wayyyyy too high. I run mine unladen on 2.5bar all round -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged 
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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3rd May 2012 3:04pm |
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| Merlin Member Since: 30 Oct 2010 Location: Newmarket Posts: 980
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My 110 Puma handbook says 35 front, rear 45 or 65 if towing/laden.
Merlin |
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3rd May 2012 5:41pm |
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| Timo Member Since: 14 Jul 2011 Location: Peterborough Ontario Posts: 171
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Thanks guys. I guess the garage had no idea if I was towing of what my weight would be (of the rover that is....)
I will play around with the 38-40 range and see how that handles/rides. Cheers Tim Series II in pieces 1984 Defender 110 (3.5l V8 now 300TDI) |
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4th May 2012 2:58am |
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| pouf Member Since: 05 Aug 2010 Location: Athens Posts: 456  
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mine too, 35/45 and she runs good.
i think there is a difference between 90 and 110. www.newfoundland.gr |
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4th May 2012 6:34am |
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| Regard Member Since: 08 Dec 2011 Location: RSA Posts: 251 
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I've got BFG M/T on and run 1.9 front and 1.8 rear.
Nice smooth ride and even tread wear |
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8th May 2012 12:05pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2615
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When overlanding I use the following rule: 1. Take the axle weight / 2 (two wheels) and divide by wheel carrying capacity (in my case 1550kg) and multiply by the tyre pressure at max load (BFG AT = 5.5) Total vehicle weight: 2500kg Front axle: 1150 (46%) Rear axle: 1350 (54%) Pressures Front: (1150/2)*(5.5/1550) = 2.04 (round off to 2.1) Rear: (1350/2)*(5.5/1550) = 2.40 (round off to 2.5) 3. When you get to gravel, measure actual tyre pressure (call it AP), deflate to half. 4. When you get back to tar, re-inflate to AP 5. For offroading on rocky trails, drop to 1.2-1.5 bar all round 6. For sandy trail, drop to 1.0-0.8 bar all round -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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8th May 2012 12:14pm |
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| bm52 Member Since: 04 Apr 2010 Location: Kent Posts: 2189
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Just copied this from the Puma workshop manual
90 - 265/75 R16 1,9 bar 2,4 bar 28 lbf/in 35 lbf/in 90 - 7.50 R16 1,9 bar 2,6 bar 28 lbf/in 38 lbf/in 110 - 7.50 R16 (except Japan) 1,9 bar 3,3 bar 28 lbf/in 48 lbf/in I had been running my front at 30 as directed by the handbook, just dropped them to 28 for a few days to see how it feels, also put the rears back to 36 which seems to feel right  BM52 |
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8th May 2012 9:46pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5758 
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My 235/85 16 BFG ATs run at 36psi front and rear so far seem OK. 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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8th May 2012 10:21pm |
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