HTX1811
Well-Known Member
- First Name
- HC
- Joined
- Mar 3, 2020
- Threads
- 26
- Messages
- 658
- Reaction score
- 1,439
- Location
- Houston, TX
- Vehicle(s)
- 19 Ranger STX 4x4,16 Audi A7
- Occupation
- Retired
- Thread starter
- #1
I have Nitto Ridge Grapplers 255/80/R17 tires. Measure 32 5/8" tall. My speedo according to a GPS speed app is off by the following:
Speedo MPH - GPS MPH - Difference
40 - 44 - +4
45 - 50 - +5
50 - 56 - +6
60 - 66-67 - +6-7
65 - 72-73 - +7-8
70 - 78 - +8
80- 88-89 - +8-9
90 - 98-99 - +9
Sometimes it bounced between two speeds thus the two numbers.
Has anyone used a tuner to adjust for larger tires? If so, what brand? SCT says no such luck and no timeframe for when they will be able to.
Speedo MPH - GPS MPH - Difference
40 - 44 - +4
45 - 50 - +5
50 - 56 - +6
60 - 66-67 - +6-7
65 - 72-73 - +7-8
70 - 78 - +8
80- 88-89 - +8-9
90 - 98-99 - +9
Sometimes it bounced between two speeds thus the two numbers.
Has anyone used a tuner to adjust for larger tires? If so, what brand? SCT says no such luck and no timeframe for when they will be able to.
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