I came across an article listing the different gears V tyre changes somewhere, will try to dig this up - might have even been on here?. Changes being stock to 35" tyres is a single issue, and 10% gear ratio change in 5th a different one - not sure you can achieve the speed change conversion as in this case one is a ratio change across all gears being the bigger tyres and the second is a ratin change on only 1 gear - at least that what i am taking from this @Winnie.