Does it fit any seatpost?

Yes. SKS lists it as fitting all seatposts, held by a power strap rather than bolts.

Will it work on my 700c commuter?

Yes. It is listed for both 26-inch and 700c wheels, so it suits most commuter and hybrid bikes.

Yes. The mount is angle adjustable, so you can set the guard to follow the wheel and cover more of the tire.

No. It is a seatpost-mounted rear guard, so it covers behind the saddle but not the whole rear wheel.

With a power strap around the seatpost. No frame eyelets or tools are needed.

The X-Tra-Dry X3 rear guard and its seatpost strap mount.

20 stores we checked sell it, including emerald bay bikes, JJs Wheelie Cool Shop, Grava Adventure Corporation, LIVE 4 BIKES, Amazon.

At emerald bay bikes, for $15.36, 33% under what the other stores charge, as of our latest check.

$15.36at emerald bay bikesChecked 1 h ago

33% under what the other stores charge

Compared across 20 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.