This frame is molded out of carbon fiber, with a carbon fiber rear triangle to boot. Shaping is extensive, working to maximize torsional stiffness at the bottom bracket and head tube, while still keeping the bike light.
This Speedfox includes a new technology called Trailsync. It’s 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. There’s a stop 35mm down before dropping the whole way. And when you let go, it comes up fast, and you’re 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 130mm for the frames that fit 650b wheels. The travel is controlled by BMC’s 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, it’s easy to fit in the frame, super-stiff at the linkage points, and light.
The bottom bracket standard is BB92. The frame also features Boost technology. That’s 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 ½" steerer.
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.
Frame: carbon/carbon rear triangleRear shock: Fox Float DPS Performance Elite Evol 120-130mm
Fork: RockShox Pike RCT3 120-130mm
Stem: BMC 55mm
Handlebars: BMC 760mm
Brakes: SRAM Guide Ultimate Rotors: 180mm
Brake levers: SRAM Guide Ultimate
Front derailleur: none
Rear derailleur: SRAM X01 Eagle
Shifter: SRAM X01 Eagle
Cassette: 12-speed SRAM Eagle 10-50
Chain: SRAM X01 EagleBottom bracket: SRAM Pressfit 92
Crankset: SRAM X01 Eagle 34t 170mm
Seatpost: BMC Trailsync Dropper Post 100mm
Saddle: WTB Volt
Wheels: DT Swiss XM 1051/ DT Swiss Spline ONE hubs : front 15x110 rear 12x148Tires: Maxxis Forekaster 27.5x2.35"
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