[ScottyF30]

Hello all,

I have a NON M-Sport f30 with Japan racing 20" alloys - I am looking to get some lowering springs; however I am unsure if I should get the Pro kit (25 to 30mm) or the Sportline (40mm) - as I have 20" alloys will I have to go for the higher option or can I get the sportline springs with 20" alloys?

Thanks for your help guys!

[cfm56d7b]

How are the roads in your area? Smooth or approaching moon-crater appearance?

20" wheels and lowering springs - without changing the compression and rebound dynamics - is a combination with many potential future regrets.

The smaller sidewall on a 20" tire will transfer more energy to shocks & springs. This energy has to be absorbed. Lowering spring without a shock designed to operate with the lowering spring will cause the suspension to bounce - plus other unfavorable side effects.

To change the compression and rebound dynamics with an opportunity to tune both independently is a more expensive proposition. KW V3 coilovers would be worth exploring.

[alohasurftoad]

sportlines have higher spring rates(stiffer) than pro-kit