TinyCadon

Member
Joined
Jan 3, 2021
Messages
23
Reaction score
18
Location
East Providence
Vehicle(s)
Plymouth Volarie
It shouldn't effect the speedometer since the only thing being changed from the factory tires is the width, right? The aspect ratio and diameter of the tire are the same as the factory tires. Or am I wrong?
No, the circumference of the tire is larger than the original tire, thus the tire will have less revolutions per mile, hence if you're going 70mph according to the speedometer you're actually going 72mph.



Advertisement



 

MattH88

Big Bend
Well-Known Member
First Name
Matt
Joined
Aug 28, 2020
Messages
64
Reaction score
44
Location
Seattle
Vehicle(s)
2021 Bronco Sport
No, the circumference of the tire is larger than the original tire, thus the tire will have less revolutions per mile, hence if you're going 70mph according to the speedometer you're actually going 72mph.
So the width of the tire from 225 to 245 affects the circumference?

The factory option on the BB are 225/65/17, so a 245/65/17 should theoretically be the same circumference if the aspect ratio and diameter are the same, no? Maybe I need a tire size for dummies explanation or at least a refresher in geometry 😅
 

TinyCadon

Member
Joined
Jan 3, 2021
Messages
23
Reaction score
18
Location
East Providence
Vehicle(s)
Plymouth Volarie
So the width of the tire from 225 to 245 affects the circumference?

The factory option on the BB are 225/65/17, so a 245/65/17 should theoretically be the same circumference if the aspect ratio and diameter are the same, no? Maybe I need a tire size for dummies explanation or at least a refresher in geometry 😅
the 65 refers to the sidewalls or 65% of 225/245, so the size of the sidewalls are 225 x .65 and 245 x .65, so the 245s are 1 inch taller than the 225s.
tire size.png
 

Raymo

Badlands
Member
Joined
Oct 19, 2020
Messages
23
Reaction score
26
Location
USA
Vehicle(s)
Bronco Sport
245/65/17 -confirmed no rubbing on full lock.
DC5E7C5D-ADAD-43ED-B254-A07C9F506979.jpeg
245/
I know there have been multiple reports that 245/65/17 tires have no rubbing "lock to lock", but I don't think that really satisfies all possible concerns. What about when there is some slight articulation of the suspension like when turning into a driveway? Or full articulation while off-roading? When you factor in the suspension, I think some questions remain. I believe that is why the @MAD Industries SEMA build has 1" lift but still only has 245/65/17 tires.
 

Washburn

Badlands
Well-Known Member
Joined
Jul 23, 2020
Messages
196
Reaction score
165
Location
NC USA
Vehicle(s)
2010 Ford Escape Limited AWD / 2005 BMW 330Ci ZHP / 2014 Mazda6 Touring
Great to know that 245s can fit without issues! Thanks for the post!

Any pics looking at the B/S from the FRONT or 3/4 Angle with the new tires. ?
Side profile really doesn't show much of a difference when it comes to WIDTH tires.

Thanks!
 

dinglehead

Badlands
Well-Known Member
First Name
J
Joined
Dec 28, 2020
Messages
121
Reaction score
91
Location
Fla
Vehicle(s)
Bronco Sport Badlands
I know there have been multiple reports that 245/65/17 tires have no rubbing "lock to lock", but I don't think that really satisfies all possible concerns. What about when there is some slight articulation of the suspension like when turning into a driveway? Or full articulation while off-roading? When you factor in the suspension, I think some questions remain. I believe that is why the @MAD Industries SEMA build has 1" lift but still only has 245/65/17 tires.
This has been my concern with 245/65s. But I figure.... Im getting a badlands so there's also a little more clearance, so its probably fine? I dont want the rubber rubbing when off road though.

We need more in depth reports from people doing this size tire. PLEASE!
 

MattH88

Big Bend
Well-Known Member
First Name
Matt
Joined
Aug 28, 2020
Messages
64
Reaction score
44
Location
Seattle
Vehicle(s)
2021 Bronco Sport
I know there have been multiple reports that 245/65/17 tires have no rubbing "lock to lock", but I don't think that really satisfies all possible concerns. What about when there is some slight articulation of the suspension like when turning into a driveway? Or full articulation while off-roading? When you factor in the suspension, I think some questions remain. I believe that is why the @MAD Industries SEMA build has 1" lift but still only has 245/65/17 tires.
My concern exactly - thanks for articulating better than I did. I am torn between 235 and 245.

As of now I am of the mind to go with the 235s until I can find some confirmation that 245s on a BB are fine when you are off road.
 

Advertisement











 
Top