Hi everyone, I make research on google I can’t find any Information wheel size custom for GLB
i wanna changé tire size 245/55r18 instead 235/55r18 OEM of MB or larger is that possible?
i see GLC 300 has option bigger size tire on the rear and front not the same size , the rear bigger , can GLB fit the same without any issues?

 

MB OEM std wheel/tire sizes for GLB and EQB are as below:

GLB250: https://www.wheel-size.com/size/mercedes/glb/2023/
EQB: https://www.wheel-size.com/size/mercedes/eqb/2023/
GLB35: https://www.wheel-size.com/size/merc...lass-amg/2023/

You can check the OEM vs proposed difference on the calculators below. Usually less than 3% change at the tire perimeter is recommended. 245/55 will give you 1.51% change and 255/55 will give you 2.98% change on tire perimeter. You have to test the bigger tires to see if they don't rub your fenders or inside shocks, esp when the car is loaded. It might be easier with a local tire shop to do that. Also some tire installers like Costco doesn't install any tire that doesn't meet the OEM sizes given above.

https://www.willtheyfit.com/
https://www.wheel-size.com/calc/

Other options is keeping your tire radius with changing the width and tire profile. You can most probably go with 255/50R18 to be on the safe side eg equivalent width of GLB35 tires. I am running 255/45R19 tires now with 19x8.5 ET42 wheels (19mm offset from OEM with the spacers: https://mbworld.org/forums/glb-class...ml#post8765043) and tires are very close to rubbing in the front.

Also I would not recommend the bigger tire in the rear, since GLB is front biased in comparison to GLC that is rear wheel biased. Advantage of keeping same size tires is tire rotation from front to back, so you can get more life out of your tires. With staggered GLC set up, tire warranty goes to half by the manufacturers, since you can not rotate your tire from front to back. Most of the acceleration and brake action for GLB happens at the front wheels. Even for rear wheel drive cars, the front brakes are usually bigger as the car rotation load shifts to front with the braking. I saw one of new Audi sport sedans have bigger tires in the front than the rear. For GLB250 you should be fine with 255 tire set up like GLB35. Wider tire will give your better performance in dry and worse in wet and snow conditions Also the type of the tire might change the performance for dry, wet and snow even within same tire manufacturer.... You might need a spare tire if you go for non-RF tire. These are things to consider without knowing why you want to change your GLB tire size. For me it was the comfort to go down from 21" wheels to 19" wheels for GLB35 while keeping similar performance using Michelin PS A/S 4 tires with shortest braking in dry/wet conditions.

 

GLB is boxy like the G-wagon, I'd like to see big wheels on these cars

 

GLK has more sharper boxy body like G-Wagon. GLK uses also the same GLB wheel/tire spec. GLK with 2" lift and MT tires:
https://mbworld.org/forums/glk-class...ml#post8442059

Another GLK with GLE wheels which is equivalent to 255/55R18 size:
https://mbworld.org/forums/glk-class...-glk-x204.html

Again GLB is newer and less people try to modify it, at least on this website. OP can try and report us with GLB250. Some of the Japanese manufacturers have the wilderness series now, but MB has not done it except E450 all terrain wagon car with limited ground clearance...

 

i have 19 X 7.5 wheel don’t know will fit 255/45r19 or 245/45r19 like 19x8.5 like your ?
Do the wheel need 19x8.5 or 18x8.5 to fit tire 255? Or 245? Can I go 18x8 wheel?

 

You can check the wheel widths from the sites below.
https://premiertiresandwheels.ca/pages/tire-size-guide
https://www.tyresizecalculator.com/c...rim-size-chart

You need min 19x8 for 255/45R19 per first site, 19x8.5 per second site. X3 has 245/50R19 on 19x7.5 wheels. You can have 255/50R18 with 18x7. All it depends on the aspect ratio of the tire. Taller sidewalls support more load:

https://proshield.com.au/rim-ringz/t...or-too-narrow/

- For 50-series tires and above, the rim width is 70% of the tire’s section width, rounded off to the nearest 0.5.
- For 45-series tires and below, the rim width is 85% of the tire’s section width, rounded off to the nearest 0.5.

Why wheel width matters:

 

that help a lot easy to understand, the second link look more complicated