Itching to customize my 2013 Mazda5

That helps a lot @theblooms. I'm deciding between the RX-8 wheels (with no tires) and the Mazda3 wheels with tires. I'm leaning towards the RX-8. I don't love how all new rims are dark grey or black and the RX-8 ones are a plain silver. Also, that would mean that I could get the 225/40s right away :)
@theblooms the I may have missed the boat on the RX-8 wheels :( As another option I can buy 18" Mazda 3 wheels (link). Would they also go with 225/40?
 
Enjoy your time with customizing it, it's a great way to get familiar with the car.
I'm not sure what your goals are but something to consider, >18" rims without any lowering leaves odd looking wheel gap due to the low profile tires. Not sure if you are aware but the MS3/RX8/(any car) rims have different styles for different model years.
 
What are rubber stems?
Air valve stem.

All Mz5 come with in-rim TMPS sensors that are capable of reading individual air pressure and air temp. Look at your rim's stem, it should have a metal cap. Mz5 dash "shows" a dummy light b/c budget cars don't come with screens in the early 2010s. For a period, Mazda try to go the cost saving route and changed to the indirect system (read below). It doesn't make sense to have a direct system sensors but only give a dummy light; this justify the change. However, the latest models went back to direct in-rim sensors b/c it is more accurate and all cars today come with screens as standard. Having to buy sensors and getting them installed = more time and money.





I love the classic RX8 5 spoke but IMO it is too angular for the curved lines of the 2nd gen Mz5 (looks great on 1st gen). Consider looking for RX8 R3 rims (newer model) or 2nd gen MS3 rims, both more curvy. If you ok with 17, Miata NC2 (not NC1) are also nice -all come with TPMS. This is all subjective so take it with a grain of salt.
 
If you want to go for aftermarket tpms sensors reporting pressure and temperature of each tire to the head unit, I would highly recommend in-rim teyes sensors, because they have replaceable batteries. Just make sure you get highest quality fresh batteries, they will last 3-4 years.
Do not go for external screw-on type, they are pain to maintain and they will definitely destroy rubber stems.
 
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