Question about tire rims size

[Garyjai]

Hi, sorry for being such a newbie... but i wanted to know if a 16inch rim would fit on a GT that has 17 inch original settings?

i have a set of 16inch winter tires + rims that is trying to see if i can fit on a GT which has 17inch

[S.F.W.]

A 16" OEM or equivalent rim will fit on the GT. To be certain your set will fit, we need to know the rim offset and tire size of the winter tire.

[JSI]

Yes, I have 16" winter rims and tires, but what S.F.W. said is needed to know if what you are looking at will fit for sure.

[Garyjai]

Yes, I have 16" winter rims and tires, but what S.F.W. said is needed to know if what you are looking at will fit for sure.

trying to fit a 2008 Mazda3 GT OEM with 205/50/R17

winter tires are 205/55/R16 - and previously used on a 2006 Mazda 3 GS.

are these what you are talking about? or the bolt size etc on the rims (which i've been reading on the internet) i was thinking if its same mazda 3

[Garyjai]

trying to fit a 2008 Mazda3 GT OEM with 205/50/R17

winter tires are 205/55/R16 - and previously used on a 2006 Mazda 3 GS.

are these what you are talking about? or the bolt size etc on the rims (which i've been reading on the internet) i was thinking if its same mazda 3


*I was thinking if its same mazda 3 that it would fit...

[S.F.W.]

trying to fit a 2008 Mazda3 GT OEM with 205/50/R17

winter tires are 205/55/R16 - and previously used on a 2006 Mazda 3 GS.

are these what you are talking about? or the bolt size etc on the rims (which i've been reading on the internet) i was thinking if its same mazda 3

These will fit fine.

[Garyjai]

These will fit fine.

sorry SFW, just wanted to make sure if I understood your reply, so you're saying that my winters of 205/55/R16 will fit on my friend's 2008 GT which has standards of 205/50/R17?

[S.F.W.]

sorry SFW, just wanted to make sure if I understood your reply, so you're saying that my winters of 205/55/R16 will fit on my friend's 2008 GT which has standards of 205/50/R17?

yes, many members, myself included move down to a 205/55/16 for the winter, from the stock 17" .

[3Sheets]

Thing to remember, is that even though you go from a 17" to a 16" rim size, the overall diameter of tire remains the same (assuming 205/50/17 and 205/55/16).

[Timos]

Excellent, thanks for clarifying this. This is exactly the scenario I am looking at, putting 16 inch snow tires on a 2008 Mazda GT that wears 17 inch OEM's normally.

I was a little concerned about the potential difference in circumference between the two sizes throwing out my speedometer or gear ratios or something, but some math cleared that up:

OEM Wheels: P205 50R17 - 17 inches is 431.8mm
Snow Wheels: P205 55R16 - 16 inches is 406.4mm
OEM Diameter = 431.8 + ((205 * 0.5) * 2) = 636.8mm
Snow Diameter = 406.4 + ((205 * 0.55) * 2) = 631.9mm
OEM Circumference = 636.8mm * Pi = 2000.57mm
Snow Circumference = 631.9mm * Pi = 1985.17mm

That means a 15.4mm difference in circumference, or 99.2%. If the speedo said 100km/h you'd actually be traveling 99.2km/h on snow tires. That's close enough for me, assuming that math is correct.