If you are thinking of changing your car tyre size or are planning on buying a new wheel/tyre combination then you can use the flash tool below for a visual tyre size comparison of your stock wheel and tyre size versus your new wheel and tyre combination.
Got a comment or question regarding the current version of the tyre size calculator? Click here to leave a comment or ask a question.
Vesion 2 of the tyre size calculator is in development, if there’s anything you’d like to see in version 2 then please feel free to leave a comment here: Tyre Size Calculator V2: Wishlist.
Why is this important?
Matching the combined wheel and tyre diameter is important as it will ensure your ride height and speedometer readings don’t change drastically. An example of this would be fitting 17″ wheels to a car that has 14″ wheels as standard, there are three main consequences:
- the ride height will change, the car body will be further from the ground.
- the top speed will increase slightly and the speedometer will under read.
- the car will accelerate slower.
Read on to see the reason for this in detail.
Tyre Size Guide
Ride Height
Take the default example in the flash tyre size calculator above, here we have a stock tyre size of 165/55R14 and a new tyre size of 215/45R17. There is a total difference of 8.82cm in the two wheel and tyre diameters, if we divide this by two we get a difference in radius of 4.41cm. If we ignore tyre pressures and the effects of adding larger, wider wheels to suspension geometry; then this is roughly how much higher the car will be from the ground.
Speedometer
Then there’s the speedometer, a cars speed reading is usually taken from the transmission and is set based on a number of predefined constants. When you change your wheel and tyre combination you are taking one of these constants and making it variable. The speedometer does not know the new value and so continues to read based on the original wheel & tyre size. If you look at the above default example again you will see that with a 215/45R17 wheel and tyre combination there is a difference of 16.4% in the speedometer reading over the stock setup. As you can see, at 60mph your speedometer should actually be reading 69.9mph!
Acceleration
If we fall back to the default example again, the 215/45R17 wheel and tyre combination has a larger overall diameter by 8.82cm. A larger diameter has a greater rotational inertia which requires more energy to accelerate. Or in other words: the bigger the wheel, the slower the acceleration.
It should be noted that putting a bigger wheel and tyre combination on your car does not reduce your cars power. Your cars power remains the same; however it takes more force to turn your car’s wheels resulting in slower acceleration.
Tyre Width Equivalency Table
You may also find the following table of recommended tyre widths for given rim widths useful when changing your tyre width.
Rim width | Min tyre width | Ideal tyre width | Max tyre width |
|---|---|---|---|
5 .0 inches | 155 mm | 165 ou 175 mm | 185 mm |
5.5 inches | 165 mm | 175 ou 185 mm | 195 mm |
6.0 inches | 175 mm | 185 ou 195 mm | 205 mm |
6.5 inches | 185 mm | 195 ou 205 mm | 215 mm |
7.0 inches | 195 mm | 205 ou 215 mm | 225 mm |
7.5 inches | 205 mm | 215 ou 225 mm | 235 mm |
8.0 inches | 215 mm | 225 ou 235 mm | 245 mm |
8.5 inches | 225 mm | 235 ou 245 mm | 255 mm |
9,0 inches | 235 mm | 245 ou 255 mm | 265 mm |
9.5 inches | 245 mm | 255 ou 265 mm | 275 mm |
10.0 inches | 255 mm | 265 or 275 mm | 285 mm |
10.5 inches | 265 mm | 275 or 285 mm | 295 mm |
11.0 inches | 275 mm | 285 or 295 mm | 305 mm |
11.5 inches | 285 mm | 295 or 305 mm | 315 mm |
12.0 inches | 295 mm | 305 or 315 mm | 325 mm |
12.5 inches | 305 mm | 315 or 325 mm | 335 mm |
Hi, I have a Suzuki Grand vitara with 235/70/16 wheels/tyres, I have bought some 17″ rims and 235/65/17 tyres, any idea of tyre pressure needed?
I WANT 4 NEW TYRES OF GOOD QUALITY AND DURABILITY FOR MY CONTESSA CLASSIC PASSENGER CAR BY HINDUSTHAN MOTORS[HM]. WHICH TYRE YOU SUGGEST FOR GOOD MILEAGE ALSO.WHAT IS THE PRICE.I AM LOCATED IN MADURAI, TAMIL NADU.
THANK YOU
SREEDHAR,
08-03-2013
hi just bought jeep tyres 245/65r. need 4 tyres of equivelent size. to fit rim.. same ie van tires. never go offroad. or exceed 80 mph your recomendation appreciated.
What size of the rim ???
If they are 17”, only 2 poss:
225 70 17
265 60 17.
Does this site have a version in inches instead of metric?
Hi,,, I have a Honda crv and that treys are 205/70R15. so i want to know can ifit 205/50R15 for my car
thanks…
You can but it will be awful and it will fuck the speedo. Plus, it is illegal to reduce total diameter of any wheel on a car. Maximum 3% in greater diameter, higher than the tire will rub somewhere somewhen.
May i ask some question?
I’m going to change my wheels and tryes from 205/60/16 to 245/40/20 for my Chevy Cruze. I was informed that the speedometer will read incorrct value. What about the CONSUMPTION RATE and AVERAGE SPEED that automatically culculate from the vehicle – will they read the exact value.
Thank you for your reply
Hi what are ideal tyre size for toyota hilux 2wd 200 model flat tray
type size on placard are 195r 14c – are 265/30z r19 or 245/45z r19 too big?
what is max size?
any chance of a Tyre calculator with KPH conversions?
i have 4 wheels on my berlingo van, 3 are 180/60 r14 and one is 175/65r14 can i change the 175 one to a 180 tyre ?
Hi just changed my wheels from 14×7 to 16×8 should I get a wheel alignment?
I have Honda Cr-V 4WD. I have on it tyre size 205/70/R15. I have left from my previous car winter tyres with size 195/65/R15. Is it possible to install on my Honda this 195/65/R15 size tyres?
Thank you in advance
Hi,
My brother’s gave me these Michelin Arctic Alpine P205/70R15 for winter.
Will they fit on my 1999 Toyota Camry 4DR LE OEM P195/70R14 car?
I am willing to buy new rims if they fit. Please let me know if it is possible? MY email address is taimingchow@yahoo.ca. Thanks very much.
Hi, i have a 2007 PAJERO V6 3.8 engine & my stuck tires is 265 x 60 x 18 . My question is if i replace my tires with 265 x 70 x 18 what will be the affect in my SUV ? Thanks
are you dumb or just real stupid….look at the conversion and visualizer on this page….you have to be a putz to ask a question like this
I am purchasing a new Renault Duster, which comes with TYRES & WHEELS :-
Tyres 215/65 R16 Tubeless
Wheels 16 inch Steel
I want to change steel wheels with ALLOYS, using the same tires.
What should be the ideal specifications for alloy wheels like rim width etc, and best brands available in India
My stock wheels/tyres is 5.5J X 15 185/65R15 Can I use tyre size 205/60R15 (can it fit?)
read the table of width fitment and btw answer is no 195 at most
help me argent
im planing to change my tire this week
i want to change my tire from 205/60/16 to 215/60/16 i know that my car goes fast from 60 to 61.1
but what about the acceleration?? it will be faster or slower
Is fuel consumption will increase ??
@Raid, yes your acceleration will decrease but it will be imperceptible. You’re fuel economy will theoretically improve as you are traveling further for each rotation of the wheel, but again this will probably be imperceptible.
i have a skoda superb with 225/45/17 tyres but i would like to change from low profile tyres is there a different size i can use without the speedo being wrong Thanks
i, I have a Chrysler Crossfire 2005 Limited Roadster Convertible. They have the OEM 18/19 staggers on them now but I want to put 18′s all the way around (I moved up North). There seems to be A LOT of confusion as to what will actually work (SAFELY) on the car. I saw your FACS and thought you guys might could give me a solid answer.
My car’s current set-up:
FRONT:
18 x 7.5 Diameter
5 x 112 Bolt pattern
66.6 Center Bore
+35mm offset
REAR:
19 x 9 Diameter
5 x 112 Bolt pattern
66.6 Center Bore
+22mm offset
I found a set of 18×8, 5×112, 66,6, but the offset is +45 and some tell me that is too high – and some say that it is okay to use spacers – but then some say the spacers would be too big and be unsafe…
Hi Kouki, I have toyota 4 runner and its standard tire is 265-65-r17. I wonder can I put 275-70-r17 new tire? I used the tire size calculator and it says that difference is around 5%. Wonder would this affect the wheeling process? Thanks for the help.
Is your new size is perfect 275 70 R17
Plz reply me
Bz I’m planing the same
hariyani@me.com
basically you are going to find starts more sluggish and burn extra fuel to get those bigger meats rolling. roy b
I have a 2002 Mercedes CLK 320 with 235/40/17 tires. I checked the manual and found that the manufacturer recommends 205/55/16. I cannot afford to purchase new rims so what would be the best tire to replace my current 235′s with that won’t dramatically change the ride or speed match of the car? The calculator on this site recommends 215/45/17? Would I get equivalent performance with the 215? Would they fit on my current rims?
hi I have a 30 year old Merc 123 series 300 D sallon. Which I believe has 5.5J alloy wheels and currently has tyre size 175/80/14 88H radial tyres. I note that I always have a speed miss match now that we have digital speed warning on our local roads. I need to replace them will a 5.5J take a 195/70/14 as in your calculator the speed match is almost spot on. Th e current tyres were put on by our local MB dealer some four years ago. It is not clear from the hand book precisely what wheels I have on the car ie 5.5J or 6J alloys some Books indicate that the Steel wheel fo rthis car is 5.5J but that the alloys may be 6.0J. Hope to hear from you Thanking you in advance
My tyres are 225x65x15 and was thinking of fitting 215x70x15 the 215′s have a slightly larger rolling dia will this inprove or decrease my MPG
Jim
will the ABS sensors be affected if i change tyres from
165x65x14 to 165x60x14
no,
won’t make any difference
There are so many wheel sizes it can be hard to know just what size you need so it’s nice to have tools like this that make the process easier.
Can you please advise the radial tyre size needed to equal the overall height of my current landrover 750×16 crossplys.
Many thanks,
TD
can i use michelin 195/60 r15 tires on a Mazda 2 with 185/55 r15 tires
My 2012 Suzuki Swift has 185/55 16 standard alloy wheels. I wish to fit 225/40 17 wheels. Will they fit or be too wide and scrape?
hi everybody,
the Specs of new reconditioned japan car suzuki kei modle 2008 660cc
i have installed my new tyres size 175 R13 instead of 155 R13.
current consumption of fuel is about 11km/liter.
is there any effect on fuel consumption due to changing the tyres size
yes there will unless u get a super chip to increase power and gas millage bc it is hard for ur car top turn over a larger rim its heavier and the radius is bigger
Hey, i’ve got a pug 306 with 175 65 R15 wheel tyre combo, i’ve just been given 4 wheels with 185 65 R15 tyres, will these 2 sizes interchange safely?
Hi. I’m just wondering why is the actual width of 265/50 R20 is different from 265/70 R17 even if it got the same width size of 265? And also, why does the 265/70 R17 fit a rim of 17 x 7.5 wherein the given table above indicates the maximum width is 235? Thanks..
hi, i have a 205/65 r 15 in my skoda octy. can i change these to 205/55 r18.as i have bought mew 18” alloy wheels that leaves me with no other option…..please anyone guide me throught this…regards.
what knd of calculator is this?, the width ofthe tyre affecting the sidewall AND the speedo rating…. the width across the face of the tyre DOES NOT affect either the speedo rating OR the width of the sidewall, who wrote this calcualtor?, the only things that affect the speedo are the size of the tyre and the sidewall profile as in (???,50,zr17)or just 17. you could have a tyre 95,60,21 (as found on some vintage cars) if you change that for 125,60,21 speedo is not affected as the profile and diameter are the same. please write one that does not mislead people.
seriously???? Nik, a tyre size is actually what is called an ‘aspect ratio’. first number is a mm measurement of the section width of the tyre, the second number is a percentage of that first measurement, and it indicates the profile height of the tyre. while the third indicates the size of rim the tyre needs to fit. You MUST know all three numbers to know the rolling diameter (which is what most people use this calculator for) of a tyre. time for a head check.
The profile is a ratio of the tyres width, so obviously the width will affect both the speedo and the height of the tyre.
Hello,
I have Opel Corsa b 1.0 12v of year 2000 with tyre 165/70×13. Can I change for 165/65×14? The new fuel consumption will be greater?
Thanks in advance!
Will 19 inch rims and tyres fit on a 2012 polo. If so wat size tyres will I need
Doubt it very much mate, I have a MR2 Roadster, originally had 15`s on with inches of space in the arches, took the arch cards out, put 17`s on but they rub bad on 215/45/17 so gotta opt for a 205/35/17, bit of arch work (Grabs the grinder
) and I may just get away with it. Ive found that with smaller cars 15`s are a better all rounder in terms of looks and handling. 17`s really should be your max.
how can changing from 15 inch wheel to an 16 inch affect on golf 4 ???
hi
i have Golf 2005 my tires is 195/65/15 can i use tires 205/55/17 ??
NOT 195/55r17. Who even sells that size! 205/40r17 would be much more affordable. just because the calculator says a size is a match does not mean that size actually exists!
195 / 55 x 17 would be a better match
I am making a tumbler type car using a fiero . I need to know how I would convert my wheels from a stock 14″ to an 18″ or 20″ daully rim.
m driving honda jazz/fit and the stock wheels are 175/65/r15 and rim width is 5.5 inch… i want to fit wider tires without changing the factory rims. tire width equivalency table says that i can fit upto 195 mm wide tire.. should i go for 195/55 tires or 185/60 tires ? i dont want tires bulging out of the rims..
either will be fine… 195/55 are likely to be cheaper and easier to get than 185/60
Hello
i am searching alot on internet about tires and rims, but i think that i am finally on a right place. I have vw polo 1.2, and it has 175/70 R14 84T . i am planing to put some 17′ rims. is this okay? and what tires size is optimal to put on that rims? i would be really thankful for answering..
cheers
195 / 45 on a 17 Inch rim will be a pretty close match for the speedo calibration
currently i am using 215x60x16, my car is a toyota camry 2010 model LE. i will be switching to an 18″ rim with an ideal tire width of 235. i would appreciate if i know what series of tire should i use without it been rub on the car when full load of 5 passenger example 45, 50, 55 or even 60 series. i like my car to be higher and not low like road hugging.
stepping upto a 18 inch rim with a car taking 4 or 5 passengers will give you a shockingly harsh ride
HARSHIT,i purchased new swift ldi with company fitted tyres size 165/80R14.i wants alloys wheels in my car for sutable tyre sizes with no effects on milage(average).please suggest me.
195/55/r15 best size available ..
My original wheels were 165R13-8PRLT but it isn’t listed on the above list any suggestions of how to compare diameters because I am currently running on 215/65 R16
i have bought 19″ / 9/1/2J alloys WHAT SIZE TYRES DO I NEED TO FIT THESE ALLOYS
I have 265 70 16 tyres on my Mitsubishi L200 and assume they are 7j rims as this is the spec. I want to get some new tyres and have been offered 205 80 R16. Will I be able to put them on these rims? according to the way i’m reading the chart here it says they are to narrow.
The standard tyres for the latest L200s are:
205 80/R16
245 65/R17
So you have been given the correct size for a standard 16″ rim.
i think the size calculator is wrong..
let me give u an example-
suppose rim size = 15 inch (381mm) and tire size is 195*55/r15
so the sidewall would be 107.25mm (195*55/100)therefore total
diameter = 488.25 mm but the visual tyre size calculator says
it would be 59.55 cm that is 595mm. please correct me if i am wrong !
@singh you’re calculations are almost right, however you need to multiply your sidewall height figure by two: 107.25 x 2 = 214.50 and then add this to the rim diameter.
The sidewall height figure applies to both the top and bottom as the tyre wraps the wheel…
Hi, my car is nissan sunny and the Stock Tyre Size is 15/185/65 and I want to change and Recommend the New tyre size is 195 / 60 R15 .Could you plz suggest me the new tyre sizes is Correct or no . if no what is the correct Size .
thanks,
I have a 2011 Chevy Silverado 1500 4×4. Stock tires are 265/70 R17. I want to know if 275/75 R17 will fit with a 1 inch leveling kit on the front.
Hi, my OEM recommended tyre size is 165 / 55 R14 but unfortunately, this tyre size is not available in my country. Could you plz suggest me the tyre sizes with minimum difference with the original one’s in rim size R13 and R15
Regards
use the very well crafted visual tyre calculator yourself – it’s up there ^^…
Hi
Can I change my BMW 745i 245/55R17 W102 to 245/45R17′s ?? as there is a huge price difference.
Many Thanks
Rich Wood
Hi. I have a 2009 vw polo 1.4tdi with 195/55 r15. I want to put 195/65 r15 on but the advice on this and other sites suggests this would be a bad idea. Would changing to 65 r15s have a dramatic affect on acceleration and subsequently the mpg? would I be better off with manufacturers recommended size?
cheers bruce.