Dears

i put front 245-35-20
Rear 285-30-20 with the breton race GTS


i hear a rubbing/friction voice with the wheels when i ride over high area or i have a back passengers while driving , so they advised me to put the 275-30-20 is this will make a differnt from 285 to 275 or not much what you think ? , iam very disapointed pleas give me your opinion and advice

 

i think the recommended tire sizes are 245/30/20 and 275/25/20.

275/30/20 is only 3mm thinner than 285/30/20, so it may not get rid of the rubbing. try rolling your fenders first.

 

The difference between a 285 and a 275 is height and width. The first 3 digit number is the width measured in millimeters, 285 millimeters and 275 millimeters wide across the tread. The middle two digit number is an aspect ratio number or a percentage of the width. For example if the tread is 285 millimeters wide, than the aspect ratio of 65 is 185.25 millimeters. Meaning the side wall of the tire is 185.25 millimeters tall. 65 percent of 285 millimeters is 185.25 millimeters. So a 275 millimeter tire with the same aspect ratio of 65 will be a narrower and shorter tire, because 65 percent of 275 is less than 65 percent of 285. The R20 means that the tire is of radial construction and the tire is made to be mounted on a 20 inch wheel or rim. Obviously you won't be putting 65 on your vehicle, this is more of an example. If all the technical mumbo jumbo is a bit much to understand, yes it will make a difference.

 

+1 for rolling your fenders since the sidewalls are thicker than recommended according to rolling diameter.

 

Rolling your fender will work if it is the tire hitting the fender obviously, if the tire is rubbing up against the actual top of your wheel well which was the situation in my case then rolling the fenders will do nothing. You will either have to get a thinner tire so that the wheel gap is not filled as much or get coilovers to adjust the height. In most situations it is the tire hitting the fender and yes fender rolling usually is the cure. If your unsure about where the tire is rubbing get some painters tape and line the inside of the fender with it and go around driving. After a few miles pull over and pull the tape off, if you see black rub marks on the tape then obviously its rubbing the fender. Others will just rub their fingers on the inside of the fender to see if any tire marks are on the inside, thats another option.

 

thank you , you are right 3mm is not a deal iwill think about the 275/25/20

 

its a nice idea about the tape iwill do it , ifeel ined thineer tire cuz , do u recomend 275/25/20 ? iam putting now 285/30/20


thanks

 

idont know why here no body do the rolling they say its risky !

 

Most body shops wont roll BMW fenders, if you look at a BMW fender an a honda fender you can certainly tell a difference as far as the thickness of the fender itself. Not to mention if they crack the paint or screw something up its more liability on their part since its a BMW vs a honda. Your best bet if you really want to get your fenders rolled is to check out any aftermarket place that sells parts and mods and things of that nature, they will usually do it or refer you to someone who will if all other body shops refuse.

 

u need a heat gun to roll it. My guy did it perfect. Why is it rubbing??? U lowered ur car?