Messingschlager Seat Reduction Ring 27.2 mm to 30.9 mm, 80 mm aluminum. The Messingschlager Reduction Bush is a practical reduction ring that allows secure and stable installation of a 27.2 mm seatpost in a 30.9 mm seat tube, ideal for older MTB or hybrid frames.

It works as an adapter with a length of 80 mm for better load distribution and to prevent tilting, while the aluminum construction ensures low weight and corrosion resistance. Ideal for MTB, trekking, and recreational users who want to use a 27.2 mm seatpost without costly frame modifications.

• Model / Series: Reduction Bush
• Product Type: Seatpost reduction ring (reduction bush / seatpost adapter)
• Use: MTB, Trekking, Hybrid, Urban / Recreational
• Compatibility: 27.2 mm seatpost in 30.9 mm seat tube
• Technologies / System: Diameter reduction for seatpost adaptation
• Material: Aluminum
• Length: 80 mm
• Inner diameter: 27.2 mm
• Outer diameter: 30.9 mm
• Color: Silver / natural aluminum
• Weight: 25 g

Includes: Reduction ring (1 piece). Does not include: Seatpost, seat clamp, mounting bolts.

Important compatibility note: Used exclusively for reducing from 30.9 mm seat tube to 27.2 mm seatpost – check diameters before installation. Not suitable for other reductions (e.g., 31.6 mm or carbon tubes). Install in the seat tube.