Can I use these Tires 21 Inch

glowbalgroup · 01-15-2019, 12:45 AM

Do not quite understand tires and sizing i do understand i have the 21 inch rim option. I am trying to find all season tires that fit the rims.
I do not care if they are fun flats. Is there tires that are all season for stock 21 inch rims?
Will 245 45 fit the front
there are SCORPION ZERO ALL SEASON - SIZE: 245/45R21 fpr the front
and
CINTURATO P7 ALL SEASON - SIZE: 275/35R21 for the rear?
thanks

nogren · 01-15-2019, 04:30 AM

There aren't much options for stock 21" sizes. You need 245/40R21 in the front.
Consider a 2nd set of wheels in 19" or 20" during winter.

dan321 · 01-15-2019, 08:43 AM

Quote:

Originally Posted by glowbalgroup

Do not quite understand tires and sizing i do understand i have the 21 inch rim option. I am trying to find all season tires that fit the rims.
I do not care if they are fun flats. Is there tires that are all season for stock 21 inch rims?
Will 245 45 fit the front
there are SCORPION ZERO ALL SEASON - SIZE: 245/45R21 fpr the front
and
CINTURATO P7 ALL SEASON - SIZE: 275/35R21 for the rear?
thanks

Size isn't the only thing you have to look at, you have to make sure the tires have the proper load index. You can look at the factory installed tires on your car to see that. On my X3 the load index is 106.

https://en.wikipedia.org/wiki/Tire_c..._code_-_en.svg

skier219 · 01-16-2019, 05:53 PM

There are no all-season tires that will fit the BMW 21" wheels and work for the X3.

fricfracfrank · 01-16-2019, 07:02 PM

Quote:

Originally Posted by glowbalgroup

Do not quite understand tires and sizing i do understand i have the 21 inch rim option. I am trying to find all season tires that fit the rims.
I do not care if they are fun flats. Is there tires that are all season for stock 21 inch rims?
Will 245 45 fit the front
there are SCORPION ZERO ALL SEASON - SIZE: 245/45R21 fpr the front
and
CINTURATO P7 ALL SEASON - SIZE: 275/35R21 for the rear?
thanks

Never heard of "fun flats"🤣🤣🤣

Orient330iNYC · 01-17-2019, 06:24 AM

1) mixing tire models front to rear is not recommended

2) the front to rear sizes are off. 245/45/21 F and 275/35/21 rear are not the same diameter and you will likely damage the transfer case over time as its going to have to slip to absorb the difference.

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/45-21 4.3in 14.8in 29.7in 93.2in 679 0.0%
275/35-21 3.8in 14.3in 28.6in 89.8in 706 -3.7%

vs
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/40-21 3.9in 14.4in 28.7in 90.2in 702 0.0%
275/35-21 3.8in 14.3in 28.6in 89.8in 706 -0.5%

jlcrompton · 01-29-2019, 10:56 AM

Seen these Goodyear eagle f1 all season tyres, size is 245/45 R21.
Will these fit?

https://www.oponeo.co.uk/tyre-details/goodyear-eagle-f1-asymmetric-suv-at-245-45-r21-104-w-xl-fp-j-lr#236630212

CAMOETO · 01-29-2019, 03:09 PM

Quote:

Originally Posted by fricfracfrank

Never heard of "fun flats"🤣🤣🤣

OP must have been referring to "fun bags"

nogren · 01-29-2019, 03:10 PM

Quote:

Originally Posted by jlcrompton

Seen these Goodyear eagle f1 all season tyres, size is 245/45 R21.
Will these fit?

https://www.oponeo.co.uk/tyre-detail...j-lr#236630212

Too big. Should be 245/40R21.

/n

01-15-2019, 12:45 AM	#1
glowbalgroup New Member 10 Rep 20 Posts Drives: BMW X3 M40I Join Date: Dec 2018 Location: Vancouver iTrader: (0)	Can I use these Tires 21 Inch Do not quite understand tires and sizing i do understand i have the 21 inch rim option. I am trying to find all season tires that fit the rims. I do not care if they are fun flats. Is there tires that are all season for stock 21 inch rims? Will 245 45 fit the front there are SCORPION ZERO ALL SEASON - SIZE: 245/45R21 fpr the front and CINTURATO P7 ALL SEASON - SIZE: 275/35R21 for the rear? thanks
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01-16-2019, 05:53 PM	#4
skier219 Captain 607 Rep 969 Posts Drives: X3 M40i, M2C, Ferrari 328 Join Date: Nov 2010 Location: USA iTrader: (0)	There are no all-season tires that will fit the BMW 21" wheels and work for the X3.
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01-17-2019, 06:24 AM	#6
Orient330iNYC Brigadier General 1469 Rep 3,552 Posts Drives: 2023 X7 40i Join Date: Apr 2007 Location: Wall St iTrader: (2)	1) mixing tire models front to rear is not recommended 2) the front to rear sizes are off. 245/45/21 F and 275/35/21 rear are not the same diameter and you will likely damage the transfer case over time as its going to have to slip to absorb the difference. Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 245/45-21 4.3in 14.8in 29.7in 93.2in 679 0.0% 275/35-21 3.8in 14.3in 28.6in 89.8in 706 -3.7% vs Specification Sidewall Radius Diameter Circumference Revs/Mile Difference 245/40-21 3.9in 14.4in 28.7in 90.2in 702 0.0% 275/35-21 3.8in 14.3in 28.6in 89.8in 706 -0.5% __________________ Present: 2023 G07 40i ZDH/ZDU/ZMP/ZMQ/2NH/ZPK/ZPP/ZRC/300/3AC Past: 2013 335i 6MT ZMM/ZDH/ZTP/3AG/494/508 Past: 2016 F34 335i xDrive ZCW/ZDA/ZDH/ZTP/ZMP/2V5/5DL Past: 2019 G01 M40i ZDA/2VF/ZPP/ZPX/688/3AC
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01-29-2019, 10:56 AM	#7
jlcrompton New Member 22 Rep 29 Posts Drives: X3 M40d and X5 M40D MHT Join Date: Aug 2018 Location: Bolton,UK iTrader: (0)	Seen these Goodyear eagle f1 all season tyres, size is 245/45 R21. Will these fit? https://www.oponeo.co.uk/tyre-details/goodyear-eagle-f1-asymmetric-suv-at-245-45-r21-104-w-xl-fp-j-lr#236630212
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01-15-2019, 04:30 AM	#2
nogren Captain 327 Rep 967 Posts Drives: G01 30d Join Date: Jun 2013 Location: Sweden iTrader: (0)	There aren't much options for stock 21" sizes. You need 245/40R21 in the front. Consider a 2nd set of wheels in 19" or 20" during winter.
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