Switching from Run-Flats to Non Run-Flats – Bounciness Issue

[lyosea]

Hi everyone,

I wanted to get your input on something I’ve noticed since switching from run-flat tires to non run-flats on my e89 28i

I recently replaced all four tires with Uniroyal Rainsport 5s, based on the garage owner’s recommendation for a good balance of price and performance. One immediate improvement is that potholes feel far less harsh — much more comfortable overall.

However, there’s something that doesn’t feel quite right. When driving on relatively smooth London roads, especially at low speeds (0–20 mph), the car has a noticeable and constant bouncing sensation. I can’t recall if this was an issue with the run-flats, but it definitely feels more pronounced now.

Could this be due to the softer sidewalls of the non run-flats? Would adjusting tire pressure — possibly increasing it — help reduce the bounce?

I’d really appreciate hearing your experiences or any advice on this. Thanks!