Ram 3500 DRW Tires
Has anyone replaced the factory 235/80R17 with 255/80R17? It looks like they are 1.2" taller and .7" wider. If so do you have plenty of space between the rear wheels?
Forum Discussion
Cummins12V98 wrote:
Taller tire means less towing capacity.
If you're talking about gearing, yes, but the impact here is relatively minimal. Otherwise, a proper wheel/tire combination could be taller and still (theoretically, for the weight police here) increase towing capacity by increasing the payload capacity.
235/80r17 = 31.8" (factory size on DRW)
255/80r17 = 33.1" (discussed here)
275/80r18 = 33.2" (factory 18 on SRW)
285/60r20 = 33.0" (factory 20 on SRW)
245/70r19.5 = 33.3" (what I run, and mentioned above in this thread)
So all things considered, going to the 255/80r17 will provide the same final drive ratio as a factory SRW with the same drivetrain/gearing. I don't consider that a big deal. Use AlfaOBD to reprogram the tire size if you want all the shift points, etc to be exact.
You could go up to a 35" with your 4.10s, and be right at 3.73 which is a very common ratio sold on Rams that tow heavy.
