Alternate (larger) tires for 2015+ Transit - Ford Transit USA Forum
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post #1 of 504 (permalink) Old 07-02-2014, 02:43:AM Thread Starter
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Question Alternate (larger) tires for 2015+ Transit

Stock tire size for the full size Ford Transit is listed as
235/65/R16 tires with a ~28" OD x 9.25W

I realize this posting may be premature as there are few of the rigs on the roads at this time...

But i'm wondering if anyone has done the math and figured out what _should_ work in the stock wheel wells?
Taller tires IMO would really aid in
1) a wee bit more ground clearance
2) a bit less anemic looking rig

Doing some playing at the Tire Size Comparison site gives some ideas:

245/75/16 is 30.5" OD x 9.65W
265/75/16 is 31.6" OD x 10.43W

Now what i can say from experience with a former rig (2007 Tacoma 4x4) we went from stock tire size to the similar 245 above (yet on the stock 17" rims). Since we kept the tread width basically the same (+1/2"w) there was no issue with tire rub in this rig/situation. Time will tell what tire size will fit in those wells. I look forward to the findings of early adopters.

----and on more ground clearance ideas...??
I also wonder what type of easy mods will be possible for small ~2 to 3" lift? Will something as easy/simple as torson key swap (etc...?) from a Ford F150 be possible?

It will be fun to see what some shops come up with. I can imagine ppl doing these simple (?) mods quite early in the game. I know for my wife and i in Van2 they will be within the first few weeks of ownership if possible.

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post #2 of 504 (permalink) Old 07-02-2014, 07:23:AM
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I noticed they are run a 65 profile, I will be running a 75 or possibly 85 profile on my ist tire change. The main reason is to bring the rpms down so to gain MPG on the open road. The Ecoboost and the diesel have more than enough torque to pull the van. However if some one is usung their van for contract work and always carring 3,000+ lbs. this may not work for you
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post #3 of 504 (permalink) Old 07-02-2014, 12:36:PM
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My reason for changing to larger 265/75/16 tires on my Sprinter was looks. I have a hard time dealing with little tires on a large van. Interesting that the larger tires on the Sprinter did make the speedometer accurate (odometer inaccurate) and gave 1/2 mpg better fuel economy. Any gain/loss in fuel economy will affected by multiple factors so it is a crap shoot if fuel economy improves or declines.

I have looked at the Transit and do not see where larger tires in the wheel wells will be a problem. Maybe in front with steering at the end of its travel will be a problem? The spare tire well looks like it will be a problem. Side to side is OK but front to back may not take a larger tire. Spare is also mounted on a black painted wheel instead of silver that was on the running wheels.
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post #4 of 504 (permalink) Old 08-23-2014, 10:29:AM
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It's interesting that Ford didn't fit a 225/75/16 on the transit. This is the standard size on T1N sprinters, and there are a ton of options in all season, all terrain, off road and snow and ice already available. Currently on tirerack, there are 2 options in the transits 235/65/16 size. The major difference is over all diameter. 27.5 vs 29.3. I don't think that less than two inches in overall diameter will be a problem.

I expect my Transit to be delivered in the dead of winter, so Wrangler Pro-grades in 225/75/16 will be going on immediately after delivery. Fingers crossed they will clear on full steering lock.

When plugging the different sizes into a gear ratio calculator, I discovered the speedometer will be off a little, but I can live with that. I also found that the two inch difference in diameter effectively splits the difference between the 3.73 and 3.31 ratio. So perhaps it wouldn't be ideal to run a larger diameter with the 3.31 for the sake of lugging the engine, and increasing trans temps.
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post #5 of 504 (permalink) Old 08-23-2014, 11:22:AM
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Quote:
Originally Posted by hammerdown View Post
It's interesting that Ford didn't fit a 225/75/16 on the transit. This is the standard size on T1N sprinters, and there are a ton of options in all season, all terrain, off road and snow and ice already available. Currently on tirerack, there are 2 options in the transits 235/65/16 size. The major difference is over all diameter. 27.5 vs 29.3. I don't think that less than two inches in overall diameter will be a problem.

I expect my Transit to be delivered in the dead of winter, so Wrangler Pro-grades in 225/75/16 will be going on immediately after delivery. Fingers crossed they will clear on full steering lock.

When plugging the different sizes into a gear ratio calculator, I discovered the speedometer will be off a little, but I can live with that. I also found that the two inch difference in diameter effectively splits the difference between the 3.73 and 3.31 ratio. So perhaps it wouldn't be ideal to run a larger diameter with the 3.31 for the sake of lugging the engine, and increasing trans temps.

I agree with you math I too have a Sprinter, however if you go with the Eco boost, their will be no lugging
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post #6 of 504 (permalink) Old 08-23-2014, 12:34:PM
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The spare tire storage area on a 148" not extended Transit appears to limit tire diameter to a maximum of 30".
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post #7 of 504 (permalink) Old 08-23-2014, 04:01:PM
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Quote:
Originally Posted by hammerdown View Post
It's interesting that Ford didn't fit a 225/75/16 on the transit. This is the standard size on T1N sprinters, and there are a ton of options in all season, all terrain, off road and snow and ice already available. Currently on tirerack, there are 2 options in the transits 235/65/16 size. The major difference is over all diameter. 27.5 vs 29.3. I don't think that less than two inches in overall diameter will be a problem.

I expect my Transit to be delivered in the dead of winter, so Wrangler Pro-grades in 225/75/16 will be going on immediately after delivery. Fingers crossed they will clear on full steering lock.

When plugging the different sizes into a gear ratio calculator, I discovered the speedometer will be off a little, but I can live with that. I also found that the two inch difference in diameter effectively splits the difference between the 3.73 and 3.31 ratio. So perhaps it wouldn't be ideal to run a larger diameter with the 3.31 for the sake of lugging the engine, and increasing trans temps.
Putting larger tires on my Sprinter made the speedo more accurate. Gotta ask a current owner how close the oem setup is to accurate. My understanding is euro vehicles are effectively required by statute to overstate your velocity. Transit I dunno, but if Ford van history is a guide they will overstate, so a larger tire should make it more accurate, not less.
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post #8 of 504 (permalink) Old 08-24-2014, 11:25:AM
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I'm going with the diesel and 3.73 LSD. So larger diameter won't bother it, but when I drove the EB there wasn't much going on below 2500 rpm.
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post #9 of 504 (permalink) Old 09-09-2014, 03:44:AM
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Garage
Good luck finding something with an equivalent load rating... 121/119R is a very high load rating for the size. Anything else in that size will not have the same load carrying capacity.

2015 Ford Transit 250
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post #10 of 504 (permalink) Old 09-10-2014, 03:16:PM
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Be careful with larger tires.

Check the clearance between the front strut and the tire wall. It is only about 1/2" with the stock size tire.

I previously stated that the max. OD that fits in the spare tire well looks to be about 30".
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