FollowupID: 411395 Submitted:
Sunday, Feb 26, 2006 at 17:44
Member - Norm C (QLD) posted:
Hi sheps, not a big deal, but here is how I read the tyre sizes:
255/70/15 has a 738mm diameter
255/75/15 has a 763.5mm diameter
Difference from standard is 25.5mm
The 31 inch has a diameter of 787.4mm
The 255/75/15 almost splits the difference between the standard and 31 inch, so is a good compromise.
I understand your point on gearing and speedo. My speedo will be out about 7%, yours will be out about 3.5%.
I will need to use a bit more grunt to get going. But I do most of my cruising when towing the CT is 4th to avoid too much stress on the weaker 5th gear. Normally cruise between 90 and 95 when doing this. With the new wheels, I'll be reving a bit lower when doing this which is not a bad thing.
It is all a compromise and I guess we all try to find the best fit for our needs.