You are bingo! The speedo error sometimes frustrates (not same level of complaints with distance and mileage stats). Theoretically, it induces as much as 6-7% of error. It's not that bad upto 100 KM/hr but as the speed increases, the error multiplies itself. It will show 160 Km/hr as 150 km/hr (compared to stock). That is huge difference! There is slight body roll noticed but only at speeds above 130-140 Km/hr. For eg. there is a big loopy turn that i used to travel through everyday. The car feels like it is riding on high-heel lady sandals as compared to Sport shoes earlier, still never out of control though. You will hear more Tyre squeaking at high speeds which you never did in stock tires. When it comes to positives, the ride becomes so comfortable, you will love it. I am not sure if Ganges will have the same feeling by swapping only 2 rear tires. It takes away ample load of crashing from suspension and potholes just don't exisit anymore. The suspension is very relaxed. You will also enjoy increased GND Clearance (in case of 4 tires). As far as scrapping to the body is concerned, i have tried that with full load and high speedy turns but yet to experience anything like that. The tradeoff's are pretty clear. Aesthetically, it enhances because most of the wheel arc is filled (especially in the front). For next tyre change, i am looking for configuration like 205/60 if any tyre company provides that. 205/55 will make ride harsh. I am not very enthusiastic about 205/65 configuration any more but it wasn't bad experience at all!!