2018 Subaru XV - needs urgent tire replacement

[kevindd992002]

You can't downgrade to 17" because you will have to change your Rims as well.



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Then why does the manual say it accepts both?

yes, one may not change tyre diameter without changing rim size.

but,
what is the objective in 'downgrading', i.e., changing the tyre specifications/dimensions?

Do you mean "one MAY CHANGE tyre diameter without changing rim size" instead? I was just thinking out loud if I don't find the exact 18" tire size, at least I have the option to go 17". But I don't know what the disadvantages are if I were to downgrade.

[dr. d]

Then why does the manual say it accepts both?



Do you mean "one MAY CHANGE tyre diameter without changing rim size" instead? I was just thinking out loud if I don't find the exact 18" tire size, at least I have the option to go 17". But I don't know what the disadvantages are if I were to downgrade.

the tyre diameter will literally dictate the rim diameter size, and vice versa.
a tyre diameter of 17 inches will only fit into a wheel diameter of 17, and a rim diameter of 18 will fit only tyres with an 18 inch diameter.
tyre diameter refers to the size of the empty space in the tyre. rim diameter refers to the distance between two opposite edges of the rim. or something like that.

tyre circumference figures directly into the car's dashboard's distance- and speed-measuring instruments.
tyre charts will show tyre changes from one size to another, with the corresponding changes in tyre circumference.
the objective of these tyre charts, is to ensure that changes in tyre circumference are kept to a minimum, when changing tyre diameters.
the manual knows about the above, hence its statement that it can accept both.

note that another potential problem with tyre size changing, is that sometimes the bigger (fatter) tyre might rub onto the car's metal under certain maneuvers.
best to ask the knowledgeables first, before purchasing yon tyres.

[kevindd992002]

the tyre diameter will literally dictate the rim diameter size, and vice versa.
a tyre diameter of 17 inches will only fit into a wheel diameter of 17, and a rim diameter of 18 will fit only tyres with an 18 inch diameter.
tyre diameter refers to the size of the empty space in the tyre. rim diameter refers to the distance between two opposite edges of the rim. or something like that.

tyre circumference figures directly into the car's dashboard's distance- and speed-measuring instruments.
tyre charts will show tyre changes from one size to another, with the corresponding changes in tyre circumference.
the objective of these tyre charts, is to ensure that changes in tyre circumference are kept to a minimum, when changing tyre diameters.
the manual knows about the above, hence its statement that it can accept both.

note that another potential problem with tyre size changing, is that sometimes the bigger (fatter) tyre might rub onto the car's metal under certain maneuvers.
best to ask the knowledgeables first, before purchasing yon tyres.

Right. So does that mean that the 225/60R17, regardless of it being accepted by the car (based on the manual), I still need to change the rim/wheel with one that has a 17" diameter?

[dr. d]

Right. So does that mean that the 225/60R17, regardless of it being accepted by the car (based on the manual), I still need to change the rim/wheel with one that has a 17" diameter?

you are correct, po.
a 17 inch tyre simply won't fit onto an 18 inch rim.

"being accepted by the car" means that the tyre will function properly when installed onto the car.
but one has to get the proper-size 17 inch rims, as the 17 inch tyres won't fit onto the 18 inch rims.

also!
aside from rim diameter, one also has to consider other rim features like offset and others.

think of the tyre-and-rim combo as one's ring-and-finger.
there are many sizes of rings, because there are many sizes of finger diameters.
for proper and comfortable fit, the ring (tyre) must be not too tight, nor too loose, around the finger (rim).

[Egan101]

225/55/18 yung stock tires ng XT ko. No issue at all putting 235/55/18 on it now.


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[yapoy86]

275/45/18 yata yung lumabas dun sa calculator nya

[kevindd992002]

Yeah, I know hindi kasya ang 275mm. I just sent the calculator results as a reference.

Here are the available 18" size variants for the Otani KC2000's though: KC2000 | Otani Tyres

My stock tires have a load index and speed rating of 98V. So if I isolate the 18" tires from that list that are at or above the same 99V rating as my stock tire's rating, I end up with these sizes:

235/55ZR18 (104W, 1.56% diameter variance)
235/50ZR18 (101W, -1.77% diameter variance)
235/45ZR18 (98W, -5.11% diameter variance)
245/45ZR18 (100Y, -3.83% diameter variance)

Further removing the ones with more than 3% diameter variance, we're left with 235/55 and 235/50 which is what Egan101 recommended in the first place. The difference in price between the two (per tire) is just around P200 so that's insignificant.

Otani vs. Yokohama? Which is generally better? May specific model ba kayong marerecommend for Yokohama?

[yapoy86]

235/45 siguro.. para mas low profile tingnan.. mas pogi.. hehe

[Egan101]

235/45 siguro.. para mas low profile tingnan.. mas pogi.. hehe

For a sedan maybe but not a crossover, unless you go the length of spending to lower the suspension.

The 235/55/18 looks beefier now on my XT. No change in performance despite the Otani KC2000 priced at around a third of a Bridgestone Dueler HP Sport.

Kung Yokohama, go for the newer models or maybe look into the offerings of Falken. They are around 70 to 80% more expensive than Otani.

Please lang, wag yung Yokohama ASPEC. Those are the stock tires on the ASX and I have no indication of using them again. They may be durable but they lack the extra grip. I changed them with Otani EK1000.


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[Egan101]

If you’re going to a Otani dealer, then ask for the wheel balancing to be free. Since you have not had your wheel alignment checked, please have it done. An extra 1k is worth it to make sure your tires will degrade poorly due to issues with wheel alignment.

The Forester XT came stock with Bridgestone Dueler HL400 and I brought it to some light off-road (crossing muddy patches of road in Kennon road, beach peeble roads in Baler, etc). Subaru’s AWD system is quite good and provides with the proper correction to maximize traction. My second set was Bridgestone Dueler HP Sport and it was a bit better than stock. I went to Lake Mapanuepe using such tires and the XT never struggled with the lahar surface, sandy riverbanks, crossing light streams, and camp trail roads.


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[kevindd992002]

If you’re going to a Otani dealer, then ask for the wheel balancing to be free. Since you have not had your wheel alignment checked, please have it done. An extra 1k is worth it to make sure your tires will degrade poorly due to issues with wheel alignment.

The Forester XT came stock with Bridgestone Dueler HL400 and I brought it to some light off-road (crossing muddy patches of road in Kennon road, beach peeble roads in Baler, etc). Subaru’s AWD system is quite good and provides with the proper correction to maximize traction. My second set was Bridgestone Dueler HP Sport and it was a bit better than stock. I went to Lake Mapanuepe using such tires and the XT never struggled with the lahar surface, sandy riverbanks, crossing light streams, and camp trail roads.


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Can the Otani KC2000 be used for some light off-roading as well?

[Egan101]

Can the Otani KC2000 be used for some light off-roading as well?

Puwede naman siguro, kung parang camping trail lang or muddy surfaces. I drive mostly on pavement so UHP fits better for my daily ride.

Pero kung Hanap mo something more like what pickups or PPVs use, then opt for an HT tire.


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[kevindd992002]

Puwede naman siguro, kung parang camping trail lang or muddy surfaces. I drive mostly on pavement so UHP fits better for my daily ride.

Pero kung Hanap mo something more like what pickups or PPVs use, then opt for an HT tire.


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For city driving and twice a month going home to the province (Taguig to Pampanga) driving, are UHP tires your best bet? Is warranty important with tires? One Otani dealer told me that Otani tires have 1 year warranty only.

[Egan101]

For city driving and twice a month going home to the province (Taguig to Pampanga) driving, are UHP tires your best bet? Is warranty important with tires? One Otani dealer told me that Otani tires have 1 year warranty only.

I see no reason why not. I also go to Pampanga around once a month.

Not sure about your dealer but I trust my source. I guess it is better than no warranty at all.

Since Taguig ka naman, madali lang Punta to my preferred shop in Angono. Ako nga, Paranaque pa pero dinayo ko yun kasi tiwala ako doon.


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[Egan101]

Yes, you need wheel alignment. By the looks, you may have suspension issues. Sana bushings lang at hindi shock absorbers.

Just follow the same air pressure as indicated since near to stock naman new tires mo.


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[kevindd992002]

Yes, you need wheel alignment. By the looks, you may have suspension issues. Sana bushings lang at hindi shock absorbers.

Just follow the same air pressure as indicated since near to stock naman new tires mo.


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How were you able to conclude that I have suspension issues? Eto kaya yung sinasabi ni FusionR last Oct 2021 na kailangan na palitan yung bushings ko kasi malaki na "punit"?

Tinanong ko kasi sa mechanic sa Olympian Tire Shack kanina, sabi niya "ok naman" daw yung mga sa ilalim ng car. So not sure if that includes the bushings and all.

[Egan101]

How were you able to conclude that I have suspension issues? Eto kaya yung sinasabi ni FusionR last Oct 2021 na kailangan na palitan yung bushings ko kasi malaki na "punit"?

Tinanong ko kasi sa mechanic sa Olympian Tire Shack kanina, sabi niya "ok naman" daw yung mga sa ilalim ng car. So not sure if that includes the bushings and all.

Masyado general yung “ok naman pang ilalim”. To check for suspension issues, you need to lift the car and try to shake each tire. There should no play or sway. Sometimes, you could also physically see rubber parts wearing out.


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[kevindd992002]

Masyado general yung “ok naman pang ilalim”. To check for suspension issues, you need to lift the car and try to shake each tire. There should no play or sway. Sometimes, you could also physically see rubber parts wearing out.


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I agree. Although that's what he answered me when I asked if the there are any worn parts like bushings, rack ends, and tire rod ends (which is what whistler told me that they'll check before doing the alignment). Initially, he did life the care and shook one tire when he was replacing the tires to eyeball if there are alignment issues. He right away said they're misaligned and the computer supported that claim when it was time to use it.

[Egan101]

I agree. Although that's what he answered me when I asked if the there are any worn parts like bushings, rack ends, and tire rod ends (which is what whistler told me that they'll check before doing the alignment). Initially, he did life the care and shook one tire when he was replacing the tires to eyeball if there are alignment issues. He right away said they're misaligned and the computer supported that claim when it was time to use it.

Sabi ni Whistl3r oks nga daw as per his technician. What you can do is to observe for tell-tale signs of suspension bushings wear. You would know if you have worn out bushings when you hear that shudder while going over 80 kmh or when shifting lanes at speed.


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