River waves like the Eisbach run about 40cm deep over concrete and rock — nothing like an ocean break. Standard fins snap on the first bottom strike.
River fins are shorter and tougher, built for constant abuse: twin-fin setups or a thruster with a tiny 1.5–2.5" "knubster" center fin, so you clear the bottom without losing control.
Most river surfers run a small setup — either twin fins or a thruster with a tiny 1.5–2.5" center fin. Our Rapid Surfing Set is built specifically for this, so you clear the bottom without losing hold.
Shallow water, rocky bottoms and constant pressure from a standing wave that never switches off all add up. Side fins take the brunt of it — that's why we sell replacement side fins individually instead of forcing you to buy a whole new set.
Check your board's fin box: US Box uses a screw-and-plate mount, Quick-Lock is a tool-free push-in system on select SUP boards. Both are available flexible and built for shallow water.
Yes — our river-ready fins come in FCS and Futures double/single tab fittings as well as US Box and Quick-Lock for SUP boards.
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