[Lancelot]

My F30 comes with front ARB 25mm/21,2mm (part 31356792118), rear 12mm (part 33556853473)

I changed for H&R but they're too strong, specifically at the back.

I'm thinking of changing to the ones that come with 440 LCI
Front 25,2mm/22,2mm 31356792120 and rear 15mm 33556853476

Do you think that will fit? Or any reason why it wouldn't fit?

[Bee Pee]

Lancelot,

15mm rear ARB BMW [pt no. 33556853476 you quote above] is also used on M135/m235i is a common upgrade for F3x cars so should fit OK.

Perhaps get in contact Tengocity - as he had H&R rear ARB installed on his F31 335d initially but once he put in ACS RS c/overs, he bought and retrofitted stock m135i ARB off my car.

BP

[Tengocity]

Originally Posted by Lancelot

My F30 comes with front ARB 25mm/21,2mm (part 31356792118), rear 12mm (part 33556853473)

I changed for H&R but they're too strong, specifically at the back.

I'm thinking of changing to the ones that come with 440 LCI
Front 25,2mm/22,2mm 31356792120 and rear 15mm 33556853476

Do you think that will fit? Or any reason why it wouldn't fit?

Yes I did the exact same thing and thought the same- rear was too much for the dampers and too much for how I wanted the car to ride. When I then fitted ACS RS coilovers I put the original front ARB back on and the 15mm bar on rear and it worked a treat.
All the bars on the 1 and 3 series are interchangeable as I understand it.

[Lancelot]

Thank you gents, most appreciated

[dotjonnL]

Would these fit Xdrive cars?

[Tengocity]

Originally Posted by dotjonnL

Would these fit Xdrive cars?

Yes, the bars are the same.