Re:Tyre Pressure on Gen4 w BFG K02 - still a bit confused

Gen.4 VIN plate front axle max. load = 680 kg.
Standard tyres have load rating of 710 kg.@ 44psi.
2 x 710 divided by 680 = 2.09
44 divided by 2.09 = 21 psi.
recommended pressure = 26 psi This is front and back light load.
Car makers determine tyre pressures to cope with static, braking and cornering loads but they start with a simple physical test. The tyre is marked across the tread with an even chalk line approx. 50mm wide and it is then run across a flat smooth surface. The greater the line imprinted on the board, the greater the load. They change the pressure to obtain an even spread of the load across the tyre.

Roger

Bill Portland wrote: I'm sure this has been discussed on here before but doesn't reducing pressures below about 24psi mean you have to live with the constant tpms warning?

You can't really live with it. When it activates it dominates the central screen and it'll show nothing else. Stupid design really. Suzuki should be embarrassed by it!

I have the basic GA model which does not have the TPMS....

A thing that I have noticed is that with some speed bumps I get a hard knock from the front end.

We have some speed bumps over here with a table top (non rounded) profile.

It almost sounds like the tyres are bottoming out.... Either that or the suspension.

Anyone experienced tyres bottoming out with lower pressures (say around 24/25 psi)?

I'd be surprised if you are deflecting the tyre that much on a speed bump at anything like town speed limits. With some of the speed bumps round here it's almost as if the tyre size is just in a sweet spot it's big enough to miss the bottom transition but not tall enough to just crest the top and it slamming into the face of the bump. I have learnt which these are and really slow down for them. Others are barely noticeable.

Lambert wrote: I'd be surprised if you are deflecting the tyre that much on a speed bump at anything like town speed limits. With some of the speed bumps round here it's almost as if the tyre size is just in a sweet spot it's big enough to miss the bottom transition but not tall enough to just crest the top and it slamming into the face of the bump. I have learnt which these are and really slow down for them. Others are barely noticeable.

Excellent way of putting it:

"Slamming into the face of the bump" describes 100% what I am experiencing....

Will slow down for them as well.

I think that is just the suspension. We have flat topped speed humps like that near us and even the 20mph limit seemed to fast for the crash you would hear. However after fitting the OME 40mm lift you can happily drive over them at 30mph with it sounding horrible.