GN-126 – Rubber Flex Disc – Mercedes Application – Bolt Circle Dia 90MM – Disc Width 26MM

The GN-126 rubber flex disc is the rubber driveshaft coupling used on MERCEDES European and import vehicles in place of a u-joint. It flexes to absorb angular movement and vibration between the transmission output flange and the driveshaft — without the velocity variation that a standard u-joint produces at high operating angles. A cracked or hardened GN-126 rubber flex disc causes driveline clunk and vibration that looks like a u-joint problem but requires a completely different fix.

Gn-126 Rubber Flex Disc — MERCEDES Bolt Pattern & Dimensions

The GN-126 rubber flex disc specs: 90MM bolt circle | 6 holes | 10MM dia | 26MM wide. 200ER, 220ER, 230ER, 240ER, 250ER, 280ER, 300ER. Bolt circle diameter is the critical measurement — it has to match both the transmission output flange and the driveshaft input flange simultaneously. Disc width determines the angular flex range. Under-rated rubber fatigues fast; over-rated rubber transmits vibration instead of absorbing it.

Flex disc replacement is straightforward: six bolts out, new GN-126 rubber flex disc in, torque to spec. The one mistake to avoid is reusing rubber that feels firm but shows fine surface cracking — hardened rubber can't flex properly and the vibration it was supposed to absorb gets passed directly to the chassis.

Key Features

• Application: MERCEDES
• Bolt circle: 90MM — must match both flanges exactly
• Bolt holes: 6 — confirm hole count matches your flange
• Bolt hole dia: 10MM
• Disc width: 26MM — controls angular flex range
• Rubber coupling — absorbs vibration and angular movement without u-joint velocity variation
• Direct swap — no modification required
• Note: 200ER, 220ER, 230ER, 240ER, 250ER, 280ER, 300ER

Specifications

• SKU: GN-126
• Brand: UDS
• Application: MERCEDES
• Bolt Circle: 90MM
• Bolt Holes: 6
• Bolt Hole Dia: 10MM
• Disc Width: 26MM
• Notes: 200ER, 220ER, 230ER, 240ER, 250ER, 280ER, 300ER