For 26" Wheel the Topeak DeFenderM2 rear mudguard has an ultra-secure quick release mounting system that easily adjusts from 25.4 to 34.9 mm, easily fitting standard and oversized seat posts. The two-pivot arm articulates for improved tyre coverage and perfect bike fit. A stiff engineering grade polymer support frame is comolded to a softer more flexible material at the trailing edge for greater durability. A highly polished underside helps prevent dirt buildup and aids in cleaning. Key features: Measurements: 40 x 12 x 10 cm / 15.8x 4.7x 3.9Weight: 230 g / 8.10 oz QR slip joint clamp fits ø25.4 - ø34.9 mm seatposts Adjustable for multiple angles Made from two tone injected high impact resistant plastic Highly polished underside If you're looking for an ultra strong rear mudguard that'll protect both you and your frame then the Defender M2 is ideal.  The seatpost clamp fits 25.4mm to 34.9mm frames.  This Topeak mudguard is made from very strong plastic which has been co-mould