Tyre pressure Agilis 109T?

[Red Bicycle]

Hi

Just replaced my 215/65/16 Agilis 106T with a new set load rated at 109T. Old tyres had a max pressure of 54psi which I ran them at. New tyres have max pressure of 69psi!! Tyre centre pressured them to 50psi. Have about 150kg of load on a permanent basis - two occupants. Question is should I run them at 69 - good idea or not?

Cheers

Michael

[team_v]

I would hazard a guess that 50PSI is fine.

You don't want to run them on maximum incase they heat up and increase the pressure further.

[Red Bicycle]

Thanks V

The 69psi is a 'cold' max so I'm assuming that this takes into account heating while driving. That being said I agree that 50 psi is probably enough but I would like to know if there is any benefit (fuel economy??) of running them high.

Cheers

Michael

[Transporter]

See how they wear out. I would start with 60psi and if they would be wearing more in the middle, then I would drop the pressure down to 55psi or even 50psi.

[Red Bicycle]

Transporter - that is what I have done (60psi is the max the servo pump would go to). I was just surprised by the 15 psi difference between the 106T and 109T rating.

[Diesel_vert]

A tyre with higher load index on the same size usually requires a higher pressure to achieve the same load capacity, as well as to reach its maximum load capacity. For instance:

The maximum load capacity per axle for single fitment 215/65 R16C 102/100T tyres is 1700 kg @ 3.25 bar (47 psi).

The maximum load capacity per axle for single fitment 215/65 R16C 106/104T tyres is 1900 kg @ 3.75 bar (54 psi).

The maximum load capacity per axle for single fitment 215/65 R16C 109/107T tyres is 2060 kg @ 4.75 bar (69 psi).

---

It therefore follows that 215/65 R16C 109/107T tyres have a load capacity (per axle) of:

1520 kg @ 3.25 bar (47 psi)

1705 kg @ 3.75 bar (55 psi)

1900 kg @ 4.30 bar (63 psi)

2060 kg @ 4.75 bar (69 psi)

---