2014 Mazda 3

[go-to-guy]

Sir Go to guy, isn't donut sparetires solid tires?

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Not sure sir. I couldn't see it on the sticker on the driver's side door and haven't checked the owners manual yet. But online it's saying to keep it 60psi (which is high) that's why I was asking. My other car's spare isn't a donut so this is my 1st and hopefully won't need to use it hehe.

[jojopad]

Not sure sir. I couldn't see it on the sticker on the driver's side door and haven't checked the owners manual yet. But online it's saying to keep it 60psi (which is high) that's why I was asking. My other car's spare isn't a donut so this is my 1st and hopefully won't need to use it hehe.

The donut spare tire in the Mazda3 (1st gen to latest gen) is an inflatable tire. Max psi is 60. I use 40psi which is suitable for any car load.

[go-to-guy]

The donut spare tire in the Mazda3 (1st gen to latest gen) is an inflatable tire. Max psi is 60. I use 40psi which is suitable for any car load.

Cool. Thanks![emoji106]

[travajante]

Speaking of tires, do you know the psi for the spare donut tire? I keep forgetting to get it checked after getting gas.

Here, good sir....

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[go-to-guy]

Thanks sir travs![emoji16]

[travajante]

Thanks sir travs![emoji16]

Haha....slowmo here. Thanks, jojo sir!

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[Walter]

40 psi for the spare ...

[jojopad]

Haha....slowmo here. Thanks, jojo sir!

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No problem sir [emoji108]

[chekers]

Sir Travs will 225x45x18 fit ? OEM is 215x45x18 ....TIA

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[RedlineJunkie]

Sir Travs will 225x45x18 fit ? OEM is 215x45x18 ....TIA

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Yes it does fit. When the speedometer shows 100kph, your actual speed is 101.4kph.

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[chekers]

Sir Redline Junkie I thought that '225' refers to the wideness of the tire therefore no change in speed. I was more considering the tirewell rub.[emoji3]

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[Nelson de Leon]

Sir Redline Junkie I thought that '225' refers to the wideness of the tire therefore no change in speed. I was more considering the tirewell rub.[emoji3]

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45 refers to the profile ratio based on width. So if your width increases, the profile (bigger outside diameter) also increases which affects speed.

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[Nelson de Leon]

Yes it does fit. When the speedometer shows 100kph, your actual speed is 101.4kph.

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For me this is actually a good thing. I've been checking the distance travelled through the speedometer and comparing it with Waze and highway distance markings. Apparently based on my observation, if Waze says I need to travel 30 kms, after 30 kms (based on the speedometer distance travelled), kulang sa ni more or less 1-2 kms.

Has anybody observed this? Or this only happens on my Mazda...

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[StockEngine]

Sir Travs will 225x45x18 fit ? OEM is 215x45x18 ....TIA

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One size up is completely fine...

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[Yatta]

For me this is actually a good thing. I've been checking the distance travelled through the speedometer and comparing it with Waze and highway distance markings. Apparently based on my observation, if Waze says I need to travel 30 kms, after 30 kms (based on the speedometer distance travelled), kulang sa ni more or less 1-2 kms.

Has anybody observed this? Or this only happens on my Mazda...

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Thats pretty normal as sometimes tires slip (speedo counts the revolutions of the tire after all) plus commercial GPS receivers are accurate only up to +/- 5-10 meters.

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[chekers]

45 refers to the profile ratio based on width. So if your width increases, the profile (bigger outside diameter) also increases which affects speed.

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Thank you, Sir Nelson de Leon!

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[chekers]

One size up is completely fine...

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Sir StockEngine, your immediate response is appreciated.

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[chekers]

Thats pretty normal as sometimes tires slip (speedo counts the revolutions of the tire after all) plus commercial GPS receivers are accurate only up to +/- 5-10 meters.

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Sir Yatta your wizardy in numbers amaze me. Thank you for the inputs.

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[Nelson de Leon]

Thats pretty normal as sometimes tires slip (speedo counts the revolutions of the tire after all) plus commercial GPS receivers are accurate only up to +/- 5-10 meters.

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Thanks for the inputs. However my issue is not in 5-10 meters but kilometers. Waze and Highway km signs are in sync. But my speedometer distance reading doesn't. I've never experienced this in any of my other cars.

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[Bravoexo]

Thanks for the inputs. However my issue is not in 5-10 meters but kilometers. Waze and Highway km signs are in sync. But my speedometer distance reading doesn't. I've never experienced this in any of my other cars.

Basic map reading... elevation changes does matter.