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quick tire size question

174 Views 8 Replies 6 Participants Last post by  TheBoy, 
E
what would be the difference if any between these size specs:

245/40R20 Y

245/40ZR20 99Y


specifically are these 2 essentially the same/interchangeable:
https://www.amazon.com/gp/product/B00KTEAW5A/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01KKWU016/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1
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JimC64
...
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#steve
The ZR 99Y tyre has a higher top speed rating.
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Glenn65
Also if I’m right, the 99Y is structured for bigger cars
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mac_doctor

Tires - What does ZR mean on the side of my tire? - Help Centre - blackcircles Canada

What does ZR mean on the side of my tire? ZR shown on the side wall of your tire is a reference to the speed rating of the tire.
www.blackcircles.ca www.blackcircles.ca
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TheBoy
99 is the load rating, Y is the speed rating.

You must never go below either number as stated in your user manual (irrespective of the fact you may never exceed 50mph), but both can be exceeded.

I had a feeling the x351 had a load rating of 102, or was that just the rears?
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TheBoy
US spec cars may have different ratings, hence needing to check your glovebox manual.
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JimC64
TheBoy said:
99 is the load rating, Y is the speed rating.

You must never go below either number as stated in your user manual (irrespective of the fact you may never exceed 50mph), but both can be exceeded.

I had a feeling the x351 had a load rating of 102, or was that just the rears?
Click to expand...
Yep 99 load rating on the front, 102 on the rear

Y rated to 186+ mph

Jim
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TheBoy
JimC64 said:
Yep 99 load rating on the front, 102 on the rear

Y rated to 186+ mph

Jim
Click to expand...
See, my memory does half work. Ish.
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