can i use 275/45 or 40 instead of 285/45 tires at rear

[omodos]

Got a dilemma here got worn rears tires 19 inch alloys all round current sizes

255/50 front

285/45 Rear

Can I get away with using 275/45 or 275/40 at the back?will it cause any damage or issues?any answers will be great

[erisol]

No, the rolling diameter need to be the same on all wheels do to elektronics and tranny.
Go to a tyreshop and they have the numbers like thishttp://dack.tk/

[omodos]

erisol it is in a language i dont understand here are the results when i put my size in , what does this , mean?

275/45-19 däck passar bra. Höjd skillnaden är -9 mm jämfört med original däcken.
Om du vill ha större fälgar så kan du prova med tex. 285/40-20 eller 295/30-21.

[motordavid]

You lose a tad with that "smaller" rear tire, rolling circumference-wise:

SpecificationSidewallRadiusDiameterCircumferenceRe volutionsSpeedometerOdometerDifference285/45-195.0"14.5"29.1"91.4"693/mi60MPH10000miN/A275/45-194.9"14.4"28.7"90.3"702/mi61MPH10123mi-1.2%

Sorry, I can never paste the results from that site in readable format.

Here is a site to try, in English:
plug two sizes into the box...

Tire size calculator

And, another site:

Tire Size Calculator - tire & wheel plus sizing

[amacman]

the calculations shown by MD are within spec so you could use 275/45R19 if that is all you can source but you would be best to fit the correct size 285/45R19.
if you had any problem with transmission you would have a chance of goodwill repair only if correct tyres are fitted

[omodos]

mOTORDavid cheers, question is will it be a problem handling etc? only my odometer will not be a true reflection of the actual miles i cover ? , my mechanic told me my abs light may come on, and the 'new' tires will be 12.375cm from rim edge to tread whereas on the old ones they are 12.825cm 'thick'.so a total of 0.45cm*2=0.9cm difference (also put the two tires side by side and 1cm or so diff is visible)also these will be less 'thick the fronts that are 12.75cm thick...being 255/50 19inch...hmmm it may look silly too, dilemmas and darn gonna get driven to my wedding in this car, rears are badly worn, and the guy selling the 275/45 only has one 285/45 and at great great prices...

[amacman]

265/50R19 is also within spec
best to fit the correct tyres if you can

[omodos]

ok thanks all. consesus seems dont do it, well gonna comit another crime by putting different brand tyres on back and front, with different treads.