The new BMC Speedfox 02 looks just like the BMC Speedfox 01. Thats because the frame is identical. Same carbon, same molds. Its a trail bike that takes the definition of trail farther out. Just like its predecessor, you can choose, depending on your height, riding style, and preferred terrain, between either 27.5 or 29er wheels. The rear triangle is fabricated out of welded, hydroformed, triple-butted aluminum for both durability and cost savings.
The only penalty is about 300g, with a frame, including shock and paint coming in at 2680g. The rest of the bike is identical in terms of position and ride. This is a bike that furthers the definition of trail by adding suspension, tuning, control, and fun.
The change people talk about first with this Speedfox is a new technology called Trailsync. Its a cable-actuated handlebar-mounted lever system that simultaneously drops the seatpost and opens up the rear suspension. Ride with your saddle high and suspension firm for the climbs and flats, drop it a bit for rough stuff, drop it all the way when letting it all hang out at high speed. The drop is 80mm for the Small, 100mm for the Medium, and both the Large and XL have 120mm. Theres a stop 35mm down before dropping the whole way. And when you let go, it comes up fast, and youre ready to go in a flash. BMC routes the cable internally to both the shock and the post. The post itself is an alloy mast with a post-topper similar to what you find on seat-masted road bikes. You cut the mast to get close to the right size, and then fine-tune with the topper clamp.
Travel for the bike is 120mm for the frames that fit 29er wheels, 130mm for the 650b wheels. The travel is controlled by BMCs proven Advanced Pivot System (APS), which features an aluminum rocker and sag indicators, so you can easily dial in your suspension. The ride is able to provide tremendous sensitivity while still isolating bumps from pedaling. Thanks to the compact design, its easy to fit in the frame, super-stiff at the linkage points, and light.
The frame is molded out of carbon fiber. Shaping is extensive, working to maximize torsional stiffness at the bottom bracket and head tube, while still keeping the bike light, and even a little designed-in vertical compliance. As the clean design suggests, all the cables are routed internally. What you cant see is that theyve also installed internal guides to make the internal routing simple and easy. Youll also find a rubber bumper underneath the bottom of the downtube, a mudguard covering the lower linkage, and another bumper on the right chainstay. The bottom bracket standard is BB92. You can set this bike up either with a 1x system, or with a sideswing front derailleur and multiple chainrings. Theres even a chain guide above the bottom bracket shell to prevent the chain from being wedged between the crank and the frame. The rear derailleur can mount to either a standard or direct mount hanger.
The frame also features Boost technology. Thats a 148x12mm rear thru-axle. The extra width means greater lateral stiffness as well as room for wider tires. You can fit 58mm wide tires between the rear stays with 6mm of clearance. The fork on complete bikes comes as a Boost fork as well. The steerer tube is designed to take a tapered 1 1/8 to 1 steerer. The frame was designed to work with 51mm offset and 120mm travel forks for the 29ers and 46mm offset and 130mm travel for the 650b wheels.
With all these standout features, it might be easy to forget about the ride. BMC hasnt. And theyve further dialed in the geometry.
As has been noted elsewhere, BMC is staffed with riders who are passionate about two-wheeled pursuits. They design their bikes to work in the demanding conditions they find outside their doors. Switzerland, being a mountainous country with trails everywhere, begs for any bike to be an efficient climber. The geometry has been dialed further to make sure the bike climbs with ease, but still have the stability necessary to descend with confidence. BMC gets to this place with medium-length chainstays and moderate head angle. They expect riders to install relatively short stems, as they spec their S frame with a 45mm stem, and the rest with 55mm.
The frame has postmounts for the brake mounting. It can fit 140mm rotors without adapters, and can go up to 180mm with adapters. When bought as a complete bike, 180mm rotors, front and rear, are standard.
The BMC Speedfox 02 adds practical features to the expansive ride.