Tyre pressure

[mickter]

The NTTA site also states the axle load is 935 @60MPH and only 850 @ 80MPH - which is a bit of a worry.[/QUOTE]

Thought the max speed limit for a trailer was 60mph.

[beamishken]

Originally Posted by mickter

The NTTA site also states the axle load is 935 @60MPH and only 850 @ 80MPH - which is a bit of a worry.

Thought the max speed limit for a trailer was 60mph.[/QUOTE]Probably not in other countries though

[_monkey]

Originally Posted by mickter

The NTTA site also states the axle load is 935 @60MPH and only 850 @ 80MPH - which is a bit of a worry.

Thought the max speed limit for a trailer was 60mph.[/QUOTE]

80 in parts of Europe.

[Limecc]

Originally Posted by Striker

If you’re not running at that weight you will have the tyres too hard and will be transmitting excessive shock into the trailer / boat. The tyre is a key part in the suspension.

I can second this.
Every trailer I ever owned (ok only 2 but not too old) had hard compressed suspension rubber and shock loads from potholes and sunken ironwork/poor road surfaces used to be transmitted directly to the boat hull. I couldn't change the axles fast enough. The only functioning suspension was the tyre sidewall.

[Limecc]

Originally Posted by mickter

The NTTA site also states the axle load is 935 @60MPH and only 850 @ 80MPH - which is a bit of a worry.
Thought the max speed limit for a trailer was 60mph.

80 in parts of Europe.

Don't mix legal limits with design parameters

[_monkey]

Originally Posted by Limecc

80 in parts of Europe.

Don't mix legal limits with design parameters

Quite right, but the trailer's cert of conformity states max speed is 80 and the tyres are rated above 80.

Not that I'd wish to travel at 80, MPG plummets once you get above 60.

[jeffstevens763@g]

Originally Posted by _monkey

Thought the max speed limit for a trailer was 60mph.

80 in parts of Europe.[/QUOTE]

Are you sure it’s not 80km

[_monkey]

https://the-trudgians.com/tyre-pressure-calculator/

This is often linked from caravan sites and it appears to be logical. Essentially, it assumes the max tyre pressure on the sidewall is required to support the max load of the tyre - the pressure reduces as the load reduces in the same proportion as max PSI/Max load (the link above explains it much better!)

In my case the tyre has a max pressure of 50PSI and rating of 500kg, so to support a 2T load over 2 axles the tyre pressure needs to be 50PSI.

I'm packing for holidays, so the boat has been emptied of fuel, water, lines etc and the tyres pumped to 50PSI. I'd like to take it to a weighbridge, but apparently Surrey don't have any!