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The Formula FX uses SDG's I-Beam mounting system, with a single rail forming a single moulded piece with the nylon hull. The design was originally devised to get around the problem of conventional saddles popping rails under hard use but has found its way into more cross-country oriented seats too.

You'll need an SDG post - having to buy into the whole system is a real drawback, though you can get a version of the Formula with normal rails. The sides sweep out closer to the nose than most saddles, but they're also deliberately flexier. Hull is limited and there's no pressure-relieving channel on top - if you like your saddles firm, give this a go.

Full write up can be found over at BikeRadar.com

Silverfish UK Ltd. Units 3a-3c Woodacre Court, Saltash Parkway Industrial Estate, Burraton Road, Saltash, Cornwall, United Kingdom, PL12 6LY
Silverfish UK Ltd. (Registration No. 4075057).

Technical specifications are for guidance only and cannot be guaranteed accurate. All offers are subject to availability and while stocks last. Errors and omissions excepted. Silverfish UK Limited acts as a credit intermediary and only offers credit products for Close Brothers Retail Finance. Its registered office is: Close Brothers Group plc, 10 Crown Place, London EC2A 4FT. Credit is subject to application and status.

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