Winter Tires question CX-9

All,

For a 2020 CX 9 GT, the wheel size is 255/50/R20. I have a spare set of 225/65/R17 winter tires.

Will they fit? Thanks!
 
:
2009 Mazda CX-9 GT
The 17" should fit no problem, but are much smaller. Results will be speedo and such will be off, and the smaller tires will leave a much larger gap in the wheel wells.
 
The 17" should fit no problem, but are much smaller. Results will be speedo and such will be off, and the smaller tires will leave a much larger gap in the wheel wells.
Doesn't the base model come with 18" rims?

Yes - I recognize the speedo will be off, but in terms of functionality it should be fine right?

And it's Canadian winter. We aren't driving fast at all.
 
17 inch rims fits, that's what my canadian dealer put on when ordering winter tires for clients. Your tire size is off (smaller) compared to the OEM dimension. On 17'' rim, ideally you should go with a tire that is a bit bigger, but this would do if you don't care about the usual caveats of speedometer being off and potentially (maybe) some traction control weirdness (i don't think anyone experienced it but it is a possibility).
 

brillo54

Resident Curmudgeon
Contributor
:
NE Indiana
:
'16 CX-5 GT FWD
You are going to lose 3/4" of ground clearance with that setup. Will that be a problem in deeper snow?
 

sm1ke

Work In Progress..
Moderator
Contributor
:
Canada
:
'18 CX-9 Signature
Is there a problem going from 31" to 28"? Legitimately asking, I don't know if it is an issue.
Everything I've seen on the internet says the only problems are the speedo not being perfectly accurate and the loss of ground clearance. I don't think there will be any issues with traction control as all four wheels will be the same size. From my understanding, if the front wheels are smaller in diameter than the rear wheels, the traction control system can interpret the difference in rotational speeds as slip and cause the system to engage.
 
Everything I've seen on the internet says the only problems are the speedo not being perfectly accurate and the loss of ground clearance. I don't think there will be any issues with traction control as all four wheels will be the same size. From my understanding, if the front wheels are smaller in diameter than the rear wheels, the traction control system can interpret the difference in rotational speeds as slip and cause the system to engage.
Speedo - yep - hear you loud and clear. I ain't going anywhere quickly in a Canadian winter. You aren't either haha.

Ground clearance - this is a highway warrior, not going north for winter camping.

So all in all - save for the ground clearance bit - there should be no safety issues with that size. It will look terrible due to the tiny wheels, but the car will safely look terrible.
 
:
Mazda CX-9 Grand Touring 2016
I'm running 245/65-17 with good results. The rule of thumb is that tires should be withing 2% of the original OD. Do the 225s have adequate weight carrying capacity for this car?
 
This web site calculator should provide you the info you need
 
:
2017 Mazda CX-9 GT
I'm planning to run 245/70R17 winter tires. They're 30.5", or 0.46" (1.5%) larger than OEM 255/50R20 tires on my 2017 GT (30.04"). 225/65/R17 tires are 28.52", or 5% smaller. You'll lose about 3/4" of ground clearance, and your speedometer will read about 5% faster than you're actually travelling. You may lose a little on real world fuel economy as well, although the onboard computer won't really show that difference - it thinks you've gone 100km when you've actually only travelled 95km.
 
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