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It could depend massively on the tyre choice as well.
I have found some tyres just don’t feel right at the OE specs, because of the different compound or construction.
The most exaggerated anecdote is using knobblies on the DR. If you run the recommended pressures with road tyres you’re golden, if you run them with knobblies it’s dangerous on tarmac. I run less than half the recommended psi just to get some compliance from the dirt wheelset, but I run maximum pressure on the road set.
Your fractional change could well be just stiffening up a softer carcass.
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Good video on tyre pressure where the advice is to go slightly harder with the pressure then ride a stretch of road in your normal style taking out a couple of psi each time until you find the pressure that feels right to you front and back. The pressures you are using is well within the ranges he discusses using.
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pdlouche
Ramsaye
@bright
No not heavy at all, and it was put together by a good shop. I called a few dealerships just now and the opinion is that 40 in the rear feels best to them as well. 40 up front is probably not helping anything. They suggest 36/40-41 f/r.