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Well, I've learned a lot in this thread. Thx.
Did not realize BMW tuned the suspension to RFTs. And Conventionals will cause the suspension to feel a bit softer
I will air up the PS4S on 20 inchers by a few pounds First time I've ever had 20 in wheels and the M Suspension.
My Tire Kit in each BMW now consists of KenSun AirCompressor, Tireject Kit, Extra Packet of Tireject, Needle Nose Pliers, Plug, Plug Reemers and Insertion tools, Rubber Cement, Air Gauge. And if all else fails, BMW SOS.
I've found that Conventional Tires on 19 and 20 inchers do smooth out the ride immensely, especially on city streets and backroads, which tend to be choppy. They are quieter on the highway. It makes the car liveable for all.
I changed on an F10 and had 46k mi on Conventionals. No issues in regular driving.
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2017 540i M, Carbon Black/Mocha, 20 in. on Michelin PS4S, CF Mirrors/Rear Spoiler
2009 328i 6 spd stick, Crimson Red/Sport Suspension, Bavsound Stage 1, 2
Former BMWs: '79 320i, '84 325e, 2000 328i, 2014 535i
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