After the cross-country bike "Fourstroke" and the enduro bike "Trailfox", it was the logical consequence for BMC to close the gap between little and a lot of suspension travel. After around 18 months of development, the "gap filler" Speedfox was born. A gap filler in a positive sense, because the Grenchen-based bike brand was missing a mountain bike in the mid-travel range.

The Speedfox uses the same rear suspension system - the tried-and-tested APS suspension system - as the Fourstroke and the Trailfox. However, with 130 millimeters of suspension travel on the front and rear wheels, BMC's trail bike is closer to the enduro sector than the cross-country sector. However, the Speedfox should clearly offer more fun on the trail than the cross-country weapon and also climb significantly better than the enduro bike Trailfox. Furthermore, BMC does not rely on smaller wheels but remains true to the 29-inch wheels with its "Big Wheel Concept".
In terms of geometry, a steep 74-degree seat angle already testifies to good uphill qualities. With a steering angle of 68.5 degrees, the Speedfox strikes a balance between smoothness and agility. The latter is also guaranteed by the short chainstays of 435 millimetres.The frame comes in three versions. The SF01 is made entirely of carbon, the SF02 has a carbon main frame and an aluminum rear triangle and the SF03 is made entirely of aluminum. All cables and lines are also routed internally. All versions come with a chain catcher and a chain guide. The models specified with Shimano are also equipped with a direct mount dropout. BMC goes its own way with the stem length. The engineers are convinced that the stem plays a central role in the handling of every bike. That is why 70-millimeter stems are fitted to all Speedfox bikes. In turn, the frame is available in five sizes, from XS to XL.

The following gradations exist among the respective versions. The Speedfox 01 is available with Shimano's XTR or Sram's XX1 drivetrain and as a frame kit. The SF02 comes in a Sram X0 version, a Shimano XT version and an XT/SLX version. The most affordable SF03 is available with a Shimano XT/SLX and a Shimano Deore combination. The weight of the top model is 11.4 kilograms, while the frame kit is specified at 2.21 kilograms.

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