Agree too. This would be a safety issue if Mazda fitted bespoke wheels that only the special tyres that they use Yokohama to make, fitted properly. Any tyre of the correct size, speed and load rating will be fine with TPMS.
www.camskill.co.uk are a good place to order tyres from and compare prices.
Just to give you the latest replacement tyre saga. I went back to Mazda and said:
"I understand Mazda will always want their customers to buy Mazda supplied spares, but taking this concept to tyres is surely a step too far. My CX-5 is fitted with Yokohama Geolandar G98 225/65R17 102V tyres. I've looked online and cannot find a single supplier for this tyre. You are saying that should I have a puncture and need a new tyre, I must fit the Yokohama to ensure the TPMS safety device will continue to operate. The implication is that if I have to fit an alternative tyre because, say, there isn't a convenient Mazda main dealer nearby (or it's a Sunday or bank holiday, or I'm on a motorway, etc), then I might be faced with having to replace that brand new tyre with a Yokohama later if the TPMS doesn't work, or worse gives erroneous warnings. This would cost, say, 150 for the alternative brand and 250 for the Yokohama, a total of 400 in all!
This is completely unacceptable. Furthermore, if fitting an alternative tyre "may conflict" with the TPMS (a safety feature on the car) then why isn't there a Warning or Caution in the CX5 handbook? In Section 6-39 there is a Warning saying "Always use wheels of the correct size on your vehicle", but no mention of the consequences of fitting an alternative make to the original.
Mazda's reply:
"Many thanks for your recent e-mail. I have been in contact with my Technical Department who confirmed our recommendation would always be to replace with like for like equipment. They have advised that the Tyre Pressure Monitoring System (TPMS) is not specifically a safety feature of the vehicle; its main function is to reduce emissions and improve the MPG by keeping the tyres at the optimum pressure.
In regards to section 6-39 in the owners manual this refers to replacing the wheels on the vehicle only. Section 6-33 in the owners manual refers to the tyres, it states to use a tyre of the same spec, size tyres, radial, bias belted, bias type on all four wheels. The only way to be certain this will happen is by using the same make and model tyre and each tyre manufacturer will differ in the tyre production."
He must have a different manual to me; section 6-33 in mine is about the battery!