[RenatFromUSSR]

Originally Posted by dream54ing

this will be a 2nd set, the 21's will be summer tires... we are considering winters, but down part is we are in Phoenix Arizona which is seldom under 40 degrees.
this set is for only when we go up north. We were told that driving in winter tires over 40 degrees is bad for the tires. not sure how true that is??? would hate to have to swap between tires each time we go up north, which is probably going to be every other weekend during the winter (Nov-Jan).

If 40 degrees Celsius is meant, then it is very bad for a Nordic type tire. The wear will double and the tires will get very hot. I would recommend following tires for mild winters or even stick to all-season tires :

[Portocale]

It was snowing a little, which here is a huuuge problem , usualy it does not.... Pirelli s are ok, good traction, good braking.

[Wild Blue]

Interesting video, Fennario thanks.

Us Alaskans very much need summer and winter tires, and most of us just swap sets twice a year

[Fennario]

Originally Posted by Wild Blue

Interesting video, Fennario thanks.

Us Alaskans very much need summer and winter tires, and most of us just swap sets twice a year

Thanks! This is the other video I like to link to:

[dream54ing]

So, discount tires spec out 265/50 R20, Nokian WR G4 SUV. is this correct? I thought car calls for size 275/45 R20.

[nZtiZia]

Originally Posted by dream54ing

So, discount tires spec out 265/50 R20, Nokian WR G4 SUV. is this correct? I thought car calls for size 275/45 R20.

I've read running out of spec tires can harm the xDrive system, drivetrain, or something like that. 265/50R20 may be a little much?

[bimmerwerks]

Originally Posted by nZtiZia

I've read running out of spec tires can harm the xDrive system, drivetrain, or something like that. 265/50R20 may be a little much?

ummm... this transfer case is used in 5, 7, x3, x5.... so.... as long as you keep the same size front and rear should be ok

[bimmerwerks]

when I checked it, it was available for that size for alpine tires...

[dream54ing]

Originally Posted by bimmerwerks

ummm... this transfer case is used in 5, 7, x3, x5.... so.... as long as you keep the same size front and rear should be ok

so you think the 265/50 R20 is okay since we are running a square setup?

[bimmerwerks]

Originally Posted by dream54ing

so you think the 265/50 R20 is okay since we are running a square setup?

I think it should be fine

Local discount tire suggest me go with 2654521 for my front and get 295 for rear

That size is identical to 265/50/20 for diameter...

Only problem is how many xl load rating are there?


For 20, I would just go with 275

[stockli81]

I took delivery a few weeks ago with 22s. Lucked out and my SA hooked me up with a previous client who just bought an M50i with the standard 20s AS who was looking to get rid of those. Picked them up for 2k.... Was looking at getting the Nokian Hakkapeliitta R3 SUV next year

[dream54ing]

Originally Posted by bimmerwerks

I think it should be fine

Local discount tire suggest me go with 2654521 for my front and get 295 for rear

That size is identical to 265/50/20 for diameter...

Only problem is how many xl load rating are there?


For 20, I would just go with 275

thanks, i rather go with oem specs as well, but he insist that 265/50/20 is comparable. just want to make sure there nothing he or i missed

[nZtiZia]

Originally Posted by dream54ing

...but he insist that 265/50/20 is comparable. just want to make sure there nothing he or i missed

show him the tire comparison numbers: 2.4% difference between OEM 275/45R20 and 265/50R20 is hardly "comparable". the numbers don't lie

[dream54ing]

Originally Posted by nZtiZia

show him the tire comparison numbers. 2.4% difference between OEM 275/45R20 and 265/50R20. hardly "comparable". the numbers don't lie

there's a chance he is comparing it with what's on the door panel (21s staggered) i currently have on. which doesnt make sense since, like you said, oem 20s have 275/45R20

[nZtiZia]

Originally Posted by dream54ing

there's a chance he is comparing it with what's on the door panel (21s staggered) i currently have on. which doesnt make sense since, like you said, OEM is 275/45R20

I don't think he knows what he's talking about. 275/45R20 and 275/40R21 and 315/35R21 all have exactly the same rolling circumference of 29.7" while the 265/50R20 is 30.4".

your use case would be better served to get a square 20" setup with 275/45R20. Bridgestone Alenza Sport all season are OEM. tire chains are more readily available for 20" than 21" wheels if you need them in deep snow. take them off when you don't need them.

[dream54ing]

Originally Posted by nZtiZia

I don't think he knows what he's talking about. 275/45R20 and 275/40R21 and 315/35R21 all have exactly the same rolling circumference of 29.7"

damm i wish you can talk to him. i dont know crap about tires. hahaha. ill show him the chart to see what he has to say, but i'm pretty sure he is comparing what the 21s can carry.

from what i remember he was typing in number from the 21s and finding comparable spec for weight, etc.

[nZtiZia]

highlighted in green below are the 20" alternative tire sizes to OEM 21". these are considered "comparable" versus anything else outside this green zone. just note the width of wheels a specific tire size can accommodate (far right column). not pictured are the tire load range (XL) required for the G05 in addition to the load index for the front and rear tires (refer to "max tire load" in owner's manual).

the issue with any tire size is finding ones that meet all your needs: wheel size, use case (all season, all weather, winter, etc), load range, load index, run flat or not.

[bimmerwerks]

Originally Posted by dream54ing

damm i wish you can talk to him. i dont know crap about tires. hahaha. ill show him the chart to see what he has to say, but i'm pretty sure he is comparing what the 21s can carry.

from what i remember he was typing in number from the 21s and finding comparable spec for weight, etc.

Originally Posted by dream54ing

damm i wish you can talk to him. i dont know crap about tires. hahaha. ill show him the chart to see what he has to say, but i'm pretty sure he is comparing what the 21s can carry.

from what i remember he was typing in number from the 21s and finding comparable spec for weight, etc.

It's not all about size that matters... You also need to look at load rating as well as if it is xl... rule of thumb is usually stay within 1percent if possible. If you go with 265/50/20, you are going bigger and potentially rubbing...

For example, 2754020 load rating of 111 but 275/35/21 only rated 107. I tried to put 2753521 square and was out of spec for rear because most of them were rating 104 or 107...

It can get complicated if you want to play around with tire size that is so called factory spec..

[bimmerwerks]

Originally Posted by nZtiZia

highlighted in green below are the 20" alternative tire sizes to OEM 21". these are considered "comparable" versus anything else outside this green zone. just note the width of wheels a specific tire size can accommodate (far right column).

the issue with any tire size is finding ones that meet all your needs: wheel size, use case (all season, all weather, winter, etc), run flat or not.

Originally Posted by nZtiZia

highlighted in green below are the 20" alternative tire sizes to OEM 21". these are considered "comparable" versus anything else outside this green zone. just note the width of wheels a specific tire size can accommodate (far right column).

the issue with any tire size is finding ones that meet all your needs: wheel size, use case (all season, all weather, winter, etc), run flat or not.

Yes but those alternative does not have right weight spec for rear.... plus you don't such a narrow tire on this big suv

[nZtiZia]

Originally Posted by bimmerwerks

Yes but those alternative does not have right weight spec for rear.... plus you don't such a narrow tire on this big suv

true, i should've mentioned load range and index (addended above) and stated that 245 is too narrow for G05. OEM spec or slightly (1%) larger is best (safest), but like you said before, there is much more to consider than just size alone.

[dream54ing]

so was able to get some clarification last night. Discount's policy doesnt allow them to sell any tires that are outside of the spec that came with the car. in this case the 21's. as mentioned by bimmerwerks, they have to have comparable load rating. the front is fine, but the rear has higher load rating and thats what they need to get minimum.

They said that he's unable to sell me tires, even if he wanted to. just becuase it doesnt meet the load rating. he does understand it's a minimal issue, but if something was to happen, they would be liable.

Do you guys thinks it will be an issue with the taller and more narrow tires? Should i call the dealership?

[nZtiZia]

Discount will sell you any sized tires as long as they meet OEM specs, which include rolling circumference and load range/rating. my car came with 21" staggered, and i had no problems ordering a 20" square setup of tires/wheels from them. (i cancelled last minute due to change in wheel choice, though.) you aren't limited to 21" tires just because your car came with them. some folks mount their 22" during warm weather and switch to their 20" during winter. below are the various OEM tire sizes depending on wheel size, which Discount will sell to you long as your wheels fit inside them, and they have the proper load rating:

19" 265/50-19 (all 4 tires)

20" 275/45-20 (all 4 tires)

20" FRONT 275/45-20
20" REAR 305/40-20

21" FRONT 275/40-21
21" REAR 315/35-21

22" FRONT 275/35-22
22" REAR 315/30-22

u may run into issues going narrower/taller such as load rating or fender rubbing, or finding a merchant willing to sell you non-OEM-spec tires for your car. there is a guy here who is happily running taller tires for his staggered 21" setup: 275/45R21 FRONT and 315/40R21 REAR "with no drivability issues" according to him, though he did have issues with one merchant not willing to sell/mount those tires, so he kept shopping around until someone would.