▁S way bar ▁Diam eter <0x09> ( mm ) <0x09> 2 0 ▁R ear ▁Sus p ension ▁D amp ing ▁R ate ▁– ▁B ump / R eb ound <0x09> ( N ▁@ ▁ 0 . 3   m / s ) <0x09> 6 0 0 / 2 3 5 0 ▁Sus p ension ▁Tra vel ▁– ▁B ump / R eb ound <0x09> ( mm ) <0x09> 1 2 5 / 8 5 ▁Spring ▁R ate <0x09> ( N / mm ) <0x09> 4 7 . 5 ▁S way bar ▁Diam eter <0x09> ( mm ) <0x09> 1 7 ▁The ▁front ▁str ut ▁is ▁a ▁light weight ▁Bil stein . ▁The ▁str uts ▁are ▁invert ed ▁to ▁deliver ▁higher ▁b ending ▁rig id ity ▁( th anks ▁to ▁larger ▁d amp ing ▁t ube ▁diameter ) ▁and ▁less ▁d amp ing ▁fade ▁as ▁a ▁result ▁of ▁increased ▁p ist on ▁size . ▁Spr ings ▁are ▁mounted ▁offset ▁so ▁their ▁centre line ▁coinc ides ▁with ▁the ▁pivot ▁axis . ▁This ▁reduces ▁road ▁shock ▁and ▁– ▁by ▁minim ising ▁b ump ▁and ▁re bound ▁fr iction ▁– ▁provides ▁less ▁v ibration . ▁ ▁The ▁B 4 ' s ▁initial ▁spring , ▁dam per ▁and ▁s way bar ▁specific ations ▁were ▁de vised ▁in ▁Japan ▁and ▁later ▁tun ed ▁at ▁the ▁N ür bur gr ing ▁circuit . ▁It ' s ▁said ▁the ▁target ▁was ▁to ▁at ▁least ▁equal ▁the ▁performance ▁of ▁the ▁B MW ▁M 3 . ▁ ▁B rak ing ▁ ▁The ▁B