Fly Bikes Proton CST 20 Inch Bike

Marsoni

M251S

$343.48

Get it in 3 business days with 1 day shipping. Friday, May 29

Fly Bikes Proton CST 20 Inch BikeThis sick rig from Fly Bikes is decked with Trebol and Fly Parts to create a shredding machine! This is the Cassette (CST) version. Clickety Clack it pedals when you go back. PROTON model is the mid range BMX Bike that performs perfectly on streets but also on ramps. A resistant bike suitable for any purpose a rider could have. 100% CrMo Frame, Fork & Bars Front & rear sealed Hubs. Pegs and Hub Guards included. 3 Piece CrMo Crankset. Removable brake

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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Really happy with the fit! The pants are a little big, but it’s nothing a belt can’t fix. The sleeves are on the short side, but my son is very tall so that could be the issue. My main complaint is the buttons get caught on threads when you’re buttoning and unbuttoning. So the quality isn’t perfect, but for the money it’s not too bad. Besides that, it’s very sleek white, slim fit, and looks great.

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Reviewed in the United States on March 26, 2026