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 Number | Make | Bolt Circle Diameter | Bolt Hole Count | Bolt Hole Diameter | Disc Width | Notes | Vehicle Class | Brand |
| 2755-583 | BMW | 105mm | 6 | 14mm | 38mm | LD | PTI | |
| GAB01-028 | BMW | 105mm | 6 | 12mm | 41.5mm | 1er, 3er, 5er, 6er, 7er, X1, Z4 | LD | SGF |
| GAB01-020 | BMW | 105mm | 6 | 12mm | 41.5mm | 3er, 5er, 6er, 7er | LD | SGF |
| GAB-106 | BMW | 105mm | 6 | 14mm | 38mm | 3er, 5er, 7er, 8er, Z8 | LD | SGF |
| GAB01-016 | BMW | 105mm | 6 | 10mm | 35.50mm | 3er, 5er, 6er, 7er, X1 | LD | SGF |
| GAB01-002 | BMW | 105mm | 6 | 14mm | 38mm | M5, 26 11 2 228 781 | LD | SGF |
| GAB01-043 | BMW | 105mm | 6 | 12mm | 41.5mm | 1er, 3er, 5er, 6er, 7er, X1, Z4 | LD | SGF |
| GAB01-026 | BMW | 110mm | 6 | 12mm | 38.5mm | 1er, 5er, 6er, 7er | LD | SGF |
| GAB01-027 | BMW | 110mm | 6 | 12mm | 42mm | 1er, 3er, 5er, 6er, 7er, X3 | LD | SGF |
| GAB-112 | BMW | 110mm | 6 | 14mm | 40mm | 8er | LD | SGF |
| GAB-111 | BMW | 110mm | 6 | 14mm | 40mm | 8er | LD | SGF |
| GAB01-003 | BMW | 110mm | 6 | 12mm | 42mm | 3er, 5er, 7er, X3 | LD | SGF |
| GAB01-024 | BMW | 110mm | 6 | 12mm | M3, M5, M6 | LD | SGF | |
| GLX-68 | BMW | 50mm | 4 | 8.32mm | 13mm | 3er, 5er, 6er, 7er, 8er, M5, M535, M635, Z1 | LD | SGF |
| GD-90 | BMW | 50mm | 4 | 8mm | 20mm | 3er | LD | SGF |
| GD-268 | BMW | 50mm | 4 | 8mm | LD | SGF | ||
| GD-60 | BMW | 50mm | 4 | 8mm | LD | SGF | ||
| GD-190 | BMW | 50mm | 4 | LD | SGF | |||
| 2755-113 | BMW | 76mm | 8 | 10mm | 38mm | LD | PTI | |
| GAB-73 | BMW | 78mm | 6 | 12mm | 32mm | 1er, 3er, 5er | LD | SGF |
| GAB-74 | BMW | 78mm | 6 | 12mm | 32mm | 3er, 5er, Z3, Z4 | LD | SGF |
| GD-72 | BMW | 78mm | 6 | 10mm | LD | SGF | ||
| GAB01-015 | BMW | 78mm | 6 | 10mm | 28mm | X5, X6 | LD | SGF |
| GAB01-009 | BMW | 78mm | 6 | 10mm | 28mm | 1er, 3er, 5er, X1, Z3, Z4 | LD | SGF |
| GAB01-038 | BMW | 78mm | 6 | 12mm | 32mm | LD | SGF | |
| 2755-832 | BMW | 96mm | 6 | 12mm | 45.25mm | LD | PTI | |
| 2755-837 | BMW | 96mm | 6 | 10mm | 45.25mm | LD | PTI | |
| GD-64 | BMW | 96mm | 6 | 12mm | 30mm | 5er, 6er, 7er, M535, Z4 | LD | SGF |
| GAB-83 | BMW | 96mm | 6 | 12mm | 30mm | M3 | LD | SGF |
| GAB-82 | BMW | 96mm | 6 | 12mm | 35mm | M3, M5, Z3, Z4 | LD | SGF |
| GAB01-017 | BMW | 96mm | 6 | 12mm | 30mm | X3, X5, X6, 3er, 5er, 7er | LD | SGF |
| GAB01-023 | BMW | 96mm | 6 | 12mm | 32mm | 5er, 6er | LD | SGF |
| GAB-84 | BMW | 96mm | 6 | 12mm | LD | SGF | ||
| GAB-87 | BMW | 96mm | 6 | 12mm | 30mm | 3er, 5er, 7er, X3, X5, X6 | LD | SGF |
| GAB01-021 | BMW | 96mm | 6 | 10mm | 33.5mm | 1er, 3er, 5er, X1 | LD | SGF |