Cars / e32 / Driveline & Transmission / BMW Guibo / Flex Disc Information

BMW Guibo / Flex Disc Information

Article by: Mike Oswald

Article applies to: all BMWs with a manual or SMG transmission (and some select automatics – such as e34s).


All BMWs with a manual or SMG transmission (even some select automatics too) have a guibo (also known as a flex disc).

This disk is located between the output shaft of the transmission and the front half shaft (tri-flange) of the drive shaft.

The purpose of this doughnut is to provide shock dampening between shift events in the drive train:

This shock dampening is in addition to either a dual-mass flywheel (which has springs installed to reduce shock), or a single-mass flywheel with a sprung hub clutch (also designed to dampen shock).

Shock (in addition to heat), is the enemy of any transmission.

I would, as an example not recommend solid metal “guibos” as they offer no shock dampening and will contribute to the eventual failure of your transmission, driveshaft . . . or both.

Below is a table of applicable guibo / flex discs for all BMWs.

A thank you to PowerTrain Industries for the data in this list.

Part NumberMakeBolt Circle DiameterBolt Hole CountBolt Hole DiameterDisc WidthNotesVehicle ClassBrand
GAB01-028BMW105mm612mm41.5mm1er, 3er, 5er, 6er, 7er, X1, Z4LDSGF
GAB01-020BMW105mm612mm41.5mm3er, 5er, 6er, 7erLDSGF
GAB-106BMW105mm614mm38mm3er, 5er, 7er, 8er, Z8LDSGF
GAB01-016BMW105mm610mm35.50mm3er, 5er, 6er, 7er, X1LDSGF
GAB01-002BMW105mm614mm38mmM5, 26 11 2 228 781LDSGF
GAB01-043BMW105mm612mm41.5mm1er, 3er, 5er, 6er, 7er, X1, Z4LDSGF
GAB01-026BMW110mm612mm38.5mm1er, 5er, 6er, 7erLDSGF
GAB01-027BMW110mm612mm42mm1er, 3er, 5er, 6er, 7er, X3LDSGF
GAB01-003BMW110mm612mm42mm3er, 5er, 7er, X3LDSGF
GAB01-024BMW110mm612mmM3, M5, M6LDSGF
GLX-68BMW50mm48.32mm13mm3er, 5er, 6er, 7er, 8er, M5, M535, M635, Z1LDSGF
GAB-73BMW78mm612mm32mm1er, 3er, 5erLDSGF
GAB-74BMW78mm612mm32mm3er, 5er, Z3, Z4LDSGF
GAB01-015BMW78mm610mm28mmX5, X6LDSGF
GAB01-009BMW78mm610mm28mm1er, 3er, 5er, X1, Z3, Z4LDSGF
GD-64BMW96mm612mm30mm5er, 6er, 7er, M535, Z4LDSGF
GAB-82BMW96mm612mm35mmM3, M5, Z3, Z4LDSGF
GAB01-017BMW96mm612mm30mmX3, X5, X6, 3er, 5er, 7erLDSGF
GAB01-023BMW96mm612mm32mm5er, 6erLDSGF
GAB-87BMW96mm612mm30mm3er, 5er, 7er, X3, X5, X6LDSGF
GAB01-021BMW96mm610mm33.5mm1er, 3er, 5er, X1LDSGF

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