BFG KO2 Revs/mile data
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,336
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From: Danbury, CT
BFG KO2 Revs/mile data
Thought you might appreciate the revs/mile by tire size to set the tire diameter with your SCT programmer.
Size. Revs/mile
LT215/65R16/D 103 S 770
LT305/70R16/E 124 R 634
LT225/75R16/E 115 S 710
LT245/75R16/E 120 S 683
LT265/75R16/E 123 R 657
LT285/75R16/E 126 R 634
LT315/75R16/E 127 R 602
LT235/85R16/E 120 S 656
LT265/70R17/C 112 S 657
LT265/70R17/E 121 S 657
LT275/70R17/E 121 R 646
LT285/70R17/E 121 R 635
LT265/65R18/E 122 R 659
LT275/65R18/E 123 R 648
LT285/65R18/E 125 R 639
LT325/65R18/E 127 R 601
LT265/70R18/E 124 R 637
LT275/70R18/E 125 R 627
LT275/55R20/D 115 S 652
LT275/60R20/D 119 S 630
LT275/65R20/E 126 S 610
LT285/65R20/E 127 S 602
30x9.50R15/C 104 S 705
34x10.50R17/D 120 R 621
35x12.50R17/E 121 R 602
37x12.50R17/D 124 R 569
35x12.50R18/E 123 R 602
Size. Revs/mile
LT215/65R16/D 103 S 770
LT305/70R16/E 124 R 634
LT225/75R16/E 115 S 710
LT245/75R16/E 120 S 683
LT265/75R16/E 123 R 657
LT285/75R16/E 126 R 634
LT315/75R16/E 127 R 602
LT235/85R16/E 120 S 656
LT265/70R17/C 112 S 657
LT265/70R17/E 121 S 657
LT275/70R17/E 121 R 646
LT285/70R17/E 121 R 635
LT265/65R18/E 122 R 659
LT275/65R18/E 123 R 648
LT285/65R18/E 125 R 639
LT325/65R18/E 127 R 601
LT265/70R18/E 124 R 637
LT275/70R18/E 125 R 627
LT275/55R20/D 115 S 652
LT275/60R20/D 119 S 630
LT275/65R20/E 126 S 610
LT285/65R20/E 127 S 602
30x9.50R15/C 104 S 705
34x10.50R17/D 120 R 621
35x12.50R17/E 121 R 602
37x12.50R17/D 124 R 569
35x12.50R18/E 123 R 602
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Changing to the correct revs per mile for nonstock sized tires will make the speedometer read correctly.
Logistics Pro
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To add on to this, SCT and a few others that I can't recall want revolutions per mile to recalibrate the speedometer and not overall tire diameter.
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Fleet Mechanic
Joined: Jul 2013
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From: Danbury, CT
As mentioned, to calibrate your speedo to read correctly after upsizing (or down sizing) your tires from stock, programmers such as SCT will ask you for rev/mile. One size up or down won't make a big difference on your speedo reading but if you have a programmer why not calibrate. That's really all the table is good for. Different tire brands and tire types will have a minor difference in revs/mile but the table could be used as a pretty good estimate for any brand.
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From: Houston, Texas
Just reprogrammed mine for some new meats today. I'm hoping it gets the speedo and odometer more accurate.
Matt, in your case, a few minutes with my AE should get your truck reading right if we haven't already.
Matt, in your case, a few minutes with my AE should get your truck reading right if we haven't already.
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Going to bring this slightly back from the dead, but I jsut installed some BFG KO2s, 305/55 R20s on my 2011 F150 and was going to reprogram for the larger tire. I have some conflicting info. According to tirerack.com the tire height is 33.2 and rev/mile is 626. But the SCT device disagrees. Its more like 608 rev/mile for a tire of that diameter which matches most tire calculators out there. Any suggestions on which to use?
Logistics Pro
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Measure the actual weight on wheels height of your tires, then use this formula to find out whichever is closer:
pi X diameter = circumference
63,360 / circumference = revs per mile.
**63,360 is simply inches in a mile (5280 X 12).
Based off the manufacturer spec of 33.2", you're looking at 609 revs/mi
pi X diameter = circumference
63,360 / circumference = revs per mile.
**63,360 is simply inches in a mile (5280 X 12).
Based off the manufacturer spec of 33.2", you're looking at 609 revs/mi
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From: Houston, Texas
Going to bring this slightly back from the dead, but I jsut installed some BFG KO2s, 305/55 R20s on my 2011 F150 and was going to reprogram for the larger tire. I have some conflicting info. According to tirerack.com the tire height is 33.2 and rev/mile is 626. But the SCT device disagrees. Its more like 608 rev/mile for a tire of that diameter which matches most tire calculators out there. Any suggestions on which to use?
For example, if you use an AE on an Excursion to correct the speedo for tire size, you can select the most approximate tire size, program, and you're done.
However, if you use IDS, it asks you how many revs per mile and then either the speedo or odometer is still inaccurate. It's closer, but it's off. Whereas if you use AE, the odometer is accurate, but the speedometer is still 1-2 mph off. This is because IDS can correct the speedometer, whereas AE can't. AE can only talk to the ABS module, it can't communicate with the Hybrid Electronic Cluster found in the 2002-2005 Excursion.
Sounds to me like the F150 does things more through the cluster than the ABS module.
Just a theory, but if someone near you has an AE, it might be worth a shot.
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