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  Tuesday, 16 May 2023
  12 Replies
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I need guidance on Tyre Upsize.

I have a MG Hector with stock tyre with size 215/55 R18 and I wish to upsize the same with the same alloys. I have a couple of options, please let me know what would be the best option for me. I have driven 9k km in 2 years.

225/55 R18
245/50 R18

As per your website, both of the upsize will have variance of less than 2% but my inclination is towards 245/50 R18 and I am not sure if they will fit into the same alloys and if yes how much bulkier they will look.

Thanks and Regards,
Abhilash Kalra
1 year ago
Dear Abhilash,

Hi, as a rule of thumb when you consider a tyre upsize apart from maximum permissible deviation rule of 2%
Important is to consider a size which should not exceed the defined RIM Width too

Stock Alloys are R18 7J - which means that tyre profile of R205 to R215 is what recommended, with maximum permissible deviation upto R225 Even if you replace alloys to, R18 7.5J - still R245 section tyres would be misfit in it

For all standards - R245 section tyres would be too wide and will even come out as odd alignment from defined tyre area too, adding on can impact suspension in medium term

R18 225/55 is the maximum upsize can go ahead with this car.
Hope should help !!
1 year ago
Thank you for your message & guidance.

Followup on this is that- Possible to upsize with 235/50 R18. The existing height might reduce by 3mm but width of the tyre will get increased.

Any positive/ negative of upsizing this or you will still suggest 225/55 R18
1 year ago
Not recommended basis stated tyre exceed in wheel width
Also, with this tyre although grip will increase a bit on highway, but ride will turn more stiff in city use as sidewall getting smaller

Hope should help !!
1 year ago
Then what is the difference b/w michelin or Continental or MRF as the tyre size is same in all brands, the speed rating is also almost similar like

225/55 R18 100V - The same tyre in different brand is at difference cost. Is quality the main reason or some other reason as well. Hows MRF in general because stock tyres are of Continental.
1 year ago

Then what is the difference b/w michelin or Continental or MRF as the tyre size is same in all brands, the speed rating is also almost similar like

Having same tyre size do not mean that ride quality will be same
Every Tyre Company manufacture tyre basis different groove, compound pattern which impact ride, comfort dynamics..
So this ends up with a diference.

Hows MRF in general because stock tyres are of Continental.

MRF offers MRF Markus Tyre.
Unfortunately we do not have reviews of same as very few buyers goes for same.
1 year ago
As you suggested I should go for 225/55 R18, there arent much brands available in the market for this size. Only Bridgestone, Yokohama and MRF have in this tyre size.

What is your suggestion?
1 year ago

As R18 225/55 is not a regular size as what used by OEM - hence limited options
As you specifically seek an upsize then this remains the only bet.

In between Brands - Yokohoma offers more firm ride and considering soft suspension of MG Hector - but i dont think even they have offering
Bridgestone Turanza may just the offering - can check and go ahead for same.

Hope should help !!
1 year ago
I could not deduce from your last message that what shall I do.

I have options from Yokohama blue earth rv02 OR Bridgestone Turanzaa. Considering MG Hector is having soft suspensions, which brand shall I go for.

Bridgestone Turanzaa is being used in Jeep Compass and Yokohama is about to launch this size in their blue earth variant by May end.

I am overall confused that which brand will offer better ride comfort. Had it not been the deviation % issue, I could have gone for 235/55 R18 where many Tyre brands are availabvle but that is creating 3.17% deviation and that is out of question.
1 year ago
Bridgestone Turanza are what signature series tyres and indeed a choice with many brands

If you are getting Bridgestone available - can definitely go ahead
Yokohoma as earlier referred are decent too - but if no size available as of now - cant be sure.
1 year ago
Hi sir, big fan of your work and thanks for your support in providing genuine suggestions.

I have couple of queries which I wish to get it clarified with your inputs.

1. For venue s optional manual petrol variant, they are not providing alloy wheels. Can I replace it with diamond cut alloys from the dealer itself?
- S(O) wheel dimensions - 195/ 65 R15
- Alloy wheels dimensions - 215/ 60 R16
Kindly please let me know if it is suggestible to replace. If yes/no, what compromise do I need to make (if any)?
2. This query is also more similar to the previous one but related to different car. For Brezza zxi variant they provide alloy wheels but not diamond cut alloys. Can I replace it with diamond cut alloys?
- Zxi wheel dimensions - 215/60 R16
- Zxi+ wheel dimensions - 215/60 R16 (both are same dimensions)
I have a fear that, if I change the wheels then will it affect the sensors like TPMS, ABS and it’s readings etc?

Waiting for your reply. Thanks a lot it advance.
1 year ago
My 2019 ertiga front tyres are 185-65-15,both are new. Now i plan to upgrade other tyre to 195-60-15or 195-65-15...any problems if two tyre upsize..??
1 year ago
I changed to 235/50/R18 from 215/55/18 on stock rims my Hector diesel Sharp after 1000 km of initial run. This is the perfect size for this car. There are no side wall height issues, the reduction is just 0.75 mm and it almost matches the stock size for iverall diameter. The slightly softer suspension is now better managed by wider footprint. My goal was to improve high speed stability and steering feedback

Hope this helps!
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