Was wondering where I could get a drag radial that is equal to the highdth of my 275/55/20 tires that came factory on my truck?
I know I will need to go to a smaller rim, but I havn't found a drag radial or equivalent that will match or be very close to my factory tire size.
Reason being, I would need to recalibrate my shift points, to get optimal performance. It may shift too soon and cause me to get a worse 1/4 mi time.
Help me out here someone.

Jim

 

I had the same problem, most of the vho trucks that I know of are running 26s and this weekend I ran a 29.5. I was thinking the 26/10.50/16 ET streets are what I am gonna go with. I dont have a tune so even the 29.5 screwed me all up.

 

what is the overall dia of the tire you have now? most people run a 255/50/16 dr. thats 26".

 

the dia on the stock 20's is 31.9 for the VHO and SS

 

i would say go with the 26" dr but you will need tuning for it to shift right. now if you wanted a taller dr i know you can get a 28 inch but anything larger than that may be a full race slick. not sure, but trust me, 26" will be nice....

 

What would be a good pressure to start out at? I'm going to try mine this week, 255-50-16 26.1" tall

 

I guess you all don't understand. If you reduce the tire size, it will mess up my shift points. I don't know by how much ,but it will effect it.
Wish I had a labtop and hp tunners software so I could do the tire size change myself. Though that's not cheap.
Is there an easier way to recalibrate the speedo for the tire change?

Jim

 

well you could allways just manually shift it like i do. or look for a used hpp3 to keep around for tire changes.