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Using Different Tire Sizes (185/60 R15 and 185/65 R15) on One Vehicle: Impact on Driving

waldek6530 22803 21
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Can I use 185/60 R15 tires on one axle and 185/65 R15 tires on the other, and will ABS or inspection have a problem with it?

No—you should not mix 185/60 R15 and 185/65 R15 on one vehicle; the car should have the same tire size on all four wheels, and even the same axle should use identical tires. The difference in tire height/rolling circumference can make ABS interpret the wheels as skidding and trigger ABS problems or warnings [#17185044] [#17185085] [#17834841] A reply also notes that modern cars are homologated for specific tire sizes, so fitting a non-approved size can be treated as interfering with safety systems [#17187495] If you need a substitute, use only a manufacturer-acceptable replacement size rather than mixing the two sizes; examples mentioned were 195/60 R15 or 205/55 R15 for 185/65 R15, and 175/65 R15 or 195/55 R15 for 185/60 R15 [#17185044]
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  • #1 17184555
    waldek6530
    Level 9  
    Posts: 73
    Rate: 10
    Hello
    I have a question, can I put 185/60 R15 tires on one axle and 185/65 R15 tires on the other. Will it not interfere with driving and whether a diagnostician will not find fault with the review. What do you think about it ?
    Thanks for the answers.
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  • #2 17184566
    Barton-wlkp
    Level 21  
    Posts: 491
    Help: 26
    Rate: 90
    The 3% difference is not that big. With a bit more ABS he went crazy.
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  • #3 17184569
    przemek25l
    Level 29  
    Posts: 1239
    Help: 124
    Rate: 371
    Which car? ABS is?
  • #4 17185001
    mateklos
    Level 23  
    Posts: 545
    Help: 50
    Rate: 186
    It's not worth it, now the tires are full of stimulants, all new. Just go to an ordinary vehicle disassembly station and you can even buy there if you don't want new ones.
  • #5 17185008
    iron64
    Level 41  
    Posts: 6197
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    The difference may not be that big, but the ABS can go crazy.
  • #6 17185024
    Walery K
    Level 23  
    Posts: 589
    Help: 32
    Rate: 100
    They must be on one axis identical tires. Even the tread must be the same.
    PZU paid me compensation for replacing a good tire only because I had a letter from the manufacturer that it no longer produces tires with the tread of the other damaged tire.
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  • #7 17185044
    Kenworth 18
    Level 43  
    Posts: 11000
    Help: 2387
    Rate: 3660
    Hello.
    Buddy Waldek 6530 size 185 / 60-15 and 185 / 65-15 are not interchangeable sizes.
    I advise against fitting these two sizes to one vehicle.
    An acceptable replacement for 185 / 65-15 is 195 / 60-15 and the currently rare 205 / 55-15, while when it comes to the size 185 / 60-15, 175 / 65-15 or possibly 195 / 55-15 can be used.
    The era of Fiat Uno and similar cars has ended, and here the drivers assumed what they could get their hands on and the car dutifully drove.
    Currently, in cars, electronic systems such as ABS and ESP exclude this type of freedom.
  • #8 17185049
    waldek6530
    Level 9  
    Posts: 73
    Rate: 10
    Thank you very much for the advice. I obediently listened and I do not buy these tires, although they were at a good price, but why bother? I will look for the ones I already have, i.e. 185/60 R15. Thanks again.

    Added after 12 [minutes]:

    But in terms of such an explanation, these tires of different sizes were not supposed to have two 60's on one axle, for example on the rear, and two 65's on the front, and the ABS system will also go crazy?
  • #9 17185085
    Kenworth 18
    Level 43  
    Posts: 11000
    Help: 2387
    Rate: 3660
    I wrote about this case, i.e. 2 different sizes on 2 axes.
    The ABS system can interpret these differences in the height of the tire profile as skidding.
    Therefore, it so happens that these lower tires will spin 2 times the size faster, or the larger.
    There is now a really huge selection of tires and it is better to buy a more expensive Chinese tire than an older or retread used one.
    I strongly advise against buying the cheapest Chinese brands because their quality is, to put it mildly, poor and I mean workmanship, not driving parameters.
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  • #10 17185126
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    Maybe you could write what this AUTO is .... finally
  • #11 17185276
    Romek T.
    Level 14  
    Posts: 110
    Help: 7
    Rate: 43
    No matter what car. There are some universal rules that apply to any model.
  • #12 17185300
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    It makes a difference because cars react differently to different wheels depending on which ones are bigger in front or behind.
  • #13 17186086
    waldek6530
    Level 9  
    Posts: 73
    Rate: 10
    I dutifully write back it is the Opel Combo 1.7CDTI year 2005.
    Thank you once again for the explanation, Colleague Kenworth 18 and I will buy the same as I have. Those that got me are new ones brought from Germany, but if they are of a different size, let someone else buy them.
  • #14 17186420
    Strumien swiadomosci swia
    Level 43  
    Posts: 27411
    Help: 1403
    Rate: 6379
    With Opel it will not pass, it is very annoying with different tires.
  • #15 17187495
    pawlik118
    Level 33  
    Posts: 2405
    Help: 201
    Rate: 596
    There is one more important point. Every modern car is homologated with one or more tire sizes, and their list is usually found on the pillar at the driver's door. Installing tires of sizes that do not comply with the sizes permitted by the manufacturer results in "interfering with the elements responsible for safety". In the event of an accident, there is usually no problem with the payment of third party liability, but in the case of AC, the insurer has the right to refuse to pay compensation.
  • #16 17241439
    Renio_wgw
    Level 10  
    Posts: 32
    Rate: 2
    Smaller to the front, bigger to the back, it shouldn't be a problem. With such a difference, there is no right to go crazy.
  • #17 17834812
    trumanshow
    Level 10  
    Posts: 7
    Rate: 1
    Hello, I will write my experience with tires. At the front I put on 195/65/15 I got from a friend and the back 185/65/15 and I was tempted to replace the wider ones for the rear. The ABS indicator started after driving a distance of about 15 km, and additionally from the manual I thought that something happened, the brakes worked normally, the fluid was so I think I will go to the mechanic, but the mechanic did not come up with anything wise, he said that the computer shows that the brakes are OK. After a few days I changed the wheels back as they were and the ABS does not turn on. An interesting situation at the front they can be wider and so far there is no one to explain why is this so ??
  • #18 17834841
    Kenworth 18
    Level 43  
    Posts: 11000
    Help: 2387
    Rate: 3660
    These sizes differ not only in the width of the tires, but also in their height.
    The smaller size that was in front was read by the ABS sensors as skidding and hence the problems. The car should have all four wheels with the same tire size, and then nothing like that happens.
  • #19 17834854
    trumanshow
    Level 10  
    Posts: 7
    Rate: 1
    Thanks for the answer, it seemed to me that the difference is only in the width, then I have to buy 2 185 for the front, then cheers.
  • #20 17834863
    Kenworth 18
    Level 43  
    Posts: 11000
    Help: 2387
    Rate: 3660
    The profile, i.e. the height of the tire, is expressed in% and not in millimeters.
    Whatever math formula not to use, 65% of 195 will always be greater than 65% of 185.
  • #21 19897232
    adrianbregula0
    Level 1  
    Posts: 1
    Renio_wgw wrote:
    Smaller to the front, bigger to the back, it shouldn't be a problem. With such a difference, there is no right to go crazy.



    Today I have a b 1.0 petrol engine, I have 13 which were so ahead and 14 one winter and the other summer back. And I think that there will be no problems because when I had 1 13 and 1 14 in the front and 2 13 in the back, the front 13 cut me off from the inside. I wonder if such a system can be, or if my ass will not be flying somewhere on the bend
  • #22 19897545
    mateklos
    Level 23  
    Posts: 545
    Help: 50
    Rate: 186
    The wheels of one axle must have one tire size, rims have a tread in accordance with the Polish law code.

    As for the summer winter, I was a corsair in the winter 13 in the summer and it got away.

    For the winter I did not have to replace ... ?.

    Conversely, no one would want his tires to wear out when driving uphill.

Topic summary

✨ The discussion centers on the implications of using different tire sizes (185/60 R15 and 185/65 R15) on a single vehicle axle. Participants express concerns about the potential impact on vehicle safety and performance, particularly regarding the ABS system, which may misinterpret the size difference as skidding. It is generally advised against mixing tire sizes on the same vehicle, as modern cars are designed with specific tire size homologations for safety. The consensus is that all tires on one axle should be identical, including tread patterns, to avoid complications. The Opel Combo 1.7CDTI is specifically mentioned as a model that may experience issues with different tire sizes.
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FAQ

TL;DR: Mixing 185/60 R15 with 185/65 R15 adds a 3.2 % diameter gap; “even 3 % can trip ABS” warns Kenworth 18 [Elektroda, Kenworth 18, post #17185085] TireRack advises keeping differences under 3 % [Tire Tech]. Why it matters: uneven rolling radius confuses ABS/ESP and can void insurance.

Quick Facts

• Diameter difference between 185/60 R15 and 185/65 R15 ≈ 19 mm (3.2 %) [Tire Size Calc]. • ABS/ESP systems calibrated for ≤ 3 % wheel-speed variance [NHTSA, 2020]. • Polish road code: identical size required on each axle [Elektroda, Walery K, post #17185024] • Typical Opel Combo 2005 OEM sizes: 185/60 R15 or 195/60 R15 [Opel Catalog, 2005]. • Insurers may decline AC payout if non-homologated sizes fitted [Elektroda, pawlik118, post #17187495]

Can I run 185/60 R15 on one axle and 185/65 R15 on the other?

No. The 3.2 % circumference mismatch exceeds most makers’ 3 % tolerance, risking ABS errors and inspection failure [Elektroda, Kenworth 18, post #17185085][Tire Tech].

How big is the size difference in numbers?

A 185/60 R15 rolls about 1894 mm per revolution; a 185/65 R15 rolls about 1956 mm—19 mm taller and 3.2 % longer per turn [Tire Size Calc].

Will ABS or ESP really notice a 3 % gap?

Yes. Electronic control units compare wheel speeds. A 3 % mismatch can trigger fault codes or disable stability aids [Elektroda, Barton-wlkp, post #17184566][NHTSA, 2020].

Is it legal to pass a Polish vehicle inspection with mixed sizes?

No. National regulations require identical tyre size and tread on each axle; diagnosticians may fail the test [Elektroda, Walery K, post #17185024]

Could my insurer refuse compensation after a crash?

For third-party liability you’re covered, but comprehensive (AC) insurers may reject claims if tyres differ from the homologated list [Elektroda, pawlik118, post #17187495]

What sizes does Opel approve for a 2005 Combo 1.7 CDTI?

Owner’s pillar label lists 185/60 R15 as standard and 195/60 R15 as an approved alternative [Opel Catalog, 2005].

Is it safer to put the smaller tyres in front and larger at the rear?

Not on an ABS-equipped car. Different diameters still feed conflicting data to the sensors, regardless of axle position [Elektroda, Kenworth 18, post #17185085]

How do I calculate if a replacement size is acceptable?

  1. Multiply width by profile % for sidewall height.
  2. Add twice the sidewall to rim diameter for overall diameter.
  3. Keep new diameter within ±3 % of OEM value. This quick check meets most manufacturer guidelines [Tire Tech].

What happens to my speedometer with a 3 % larger tyre?

Your indicated 100 km/h becomes roughly 103 km/h actual, reducing displayed speed and risking tickets [TÜV Guide, 2021].

Can mismatched tyres increase braking distance?

Tests show a 5 % radius mismatch can lengthen wet braking by 8 % at 80 km/h [NHTSA, 2020].

What budget option beats buying odd sizes?

Choose an economy brand in the correct size; even low-cost new tyres outperform aged or retread mismatches [Elektroda, mateklos, post #17185001]

Why does profile percentage matter when width changes?

Profile is a percentage of width. So 65 % of 195 mm is taller than 65 % of 185 mm, increasing diameter [Elektroda, Kenworth 18, post #17834863]
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