# Different car tyre on front and rear wheel

**URL:** <https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193>\
**Category:** Maintenance/Repairs\
**Created:** [September 16, 2015, 7:28pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193 "2015-09-16T19:28:13Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![carcandy](https://avatars.discourse-cdn.com/v4/letter/c/5fc32e/32.png) [@carcandy](https://community.cartalk.com/u/carcandy)\
**Post date:** [September 16, 2015, 7:28pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/1 "2015-09-16T19:28:13Z")

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Guys i have a fwd chevrolet beat car with 165/65/14 tyre installed. Recently i bought 2 new tyres n they gave me 155/70/14 is it ok if i put them on rear wheel so tht front wheel has 165/65/14 and rear wheel 155/70/14. Help me. Thnx

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**Author:** ![carcandy](https://avatars.discourse-cdn.com/v4/letter/c/5fc32e/32.png) [@carcandy](https://community.cartalk.com/u/carcandy)\
**Post date:** [September 16, 2015, 7:38pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/2 "2015-09-16T19:38:50Z")

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Plz help

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [September 16, 2015, 8:38pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/3 "2015-09-16T20:38:47Z")

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Yeah, for a beater that 10mm in width isn’t going to make any real difference. But WHY did “they” give you a different tyre size than the front?

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [September 16, 2015, 9:04pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/4 "2015-09-16T21:04:35Z")

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The difference in overall diameter between the sizes is only ~0.1" or 2.5mm so you should be alright.

[https://www.tacomaworld.com/tirecalc?tires=155-70r14-165-65r14](https://www.tacomaworld.com/tirecalc?tires=155-70r14-165-65r14)

Ed B.

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**Author:** ![carcandy](https://avatars.discourse-cdn.com/v4/letter/c/5fc32e/32.png) [@carcandy](https://community.cartalk.com/u/carcandy)\
**Post date:** [September 17, 2015, 12:04am UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/5 "2015-09-17T00:04:41Z")

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I orderd online. I thught it had better fuel efficency so gave it a try thnx

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**Author:** ![CapriRacer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/capriracer/32/22_2.png) [@CapriRacer](https://community.cartalk.com/u/CapriRacer)\
**Post date:** [September 17, 2015, 4:12pm UTC](https://community.cartalk.com/t/different-car-tyre-on-front-and-rear-wheel/91193/6 "2015-09-17T16:12:53Z")

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My first reaction was that you got the size wrong - but I see they are available, just not in the US.

Second, the 155/70R14 has a LOWER load index than the 165/65R14’s - and directionally that is WORSE for fuel economy. However, rolling resistance in tires is more about the tread rubber than anything else.

And lastly, this is not a good situation. You’re going to apply tires that are substantially different, and that MIGHT lead to problems - and you won’t know until it is too late. You should have done your homework BEFORE you purchased the tires.