[Trigger]

Have M670 with 15.5-38 on rear,it sits low on the backend what bigger size tire could I go to staying with the same rims?

 

[bmich]

What width rim is it? 18.4 x 38 tires typically go on a 16" rim. If you want tires specs check out Firestone website. Give all the specs for tires.

Another option is to go to a tractor wrecker. You can get what ever tire and rim combo in a 38" to fit on the hub. Then could go 18.4 or 20.8 wide.

 

[Trigger]

Think they are only 15” rims,probably have to look at changing rims

 

[whtbaron]

Looks like you have some room, but double check for fender clearance.

 

[RedRiverEast]

15" rims are made for 16.9 x 38 tires. That would be somewhat bigger.