Kumho Ecsta PS91 is a summer tyre made in total of 48 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 10mm wider than the narrowest dimension (225) and 40mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height. In 235/40 R18, there is only one possible speed index for Kumho Ecsta PS91 - "Y", which is good for speeds up to 300 km/h. In 235/40 R18, Ecsta PS91 usually competes against Advan Sport V105, which is a tyre from Yokohama with a rating of 0%, compared to 21% of the Kumho in question.
Ranked #8 of 9Finishing 8th out of 9 competitors, the Kumho Ecsta PS91 showed a decent performance in some aspects but fell behind in current standards, with plans for a successor already underway. Its strongest selling point, for now, is its cost-effectiveness. The tire delivered solid results in the wet braking test and aquaplaning, demonstrating its capability to handle wet conditions. However, its tendency toward understeer and conservative handling around wet tracks highlighted a limitation in its sporting credentials. On dry surfaces, the tire was critiqued for providing limited feedback and reacting imprecisely to sudden directional changes, with a noticeable understeer at the limit and a higher rolling resistance.