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BMC launches GranFondo GF01

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Fat Continental tubular tires and Easton carbon wheels for the BMC team for Paris-Roubaix.

Fat Continental tubular tires and Easton carbon wheels for the BMC team for Paris-Roubaix.
(Image credit: Jonny Irick)
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BMC launched the new GranFondo GF01 'endurance' model in Kortrijk, Belgium just ahead of the start of Paris-Roubaix

BMC launched the new GranFondo GF01 'endurance' model in Kortrijk, Belgium just ahead of the start of Paris-Roubaix
(Image credit: Robin Wilmott)
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Stack is taller and reach is shorter on the GranFondo GF01's new 'endurance' geometry but it's not an extreme difference relative to the TeamMachine SLR01.

Stack is taller and reach is shorter on the GranFondo GF01's new 'endurance' geometry but it's not an extreme difference relative to the TeamMachine SLR01.
(Image credit: Robin Wilmott)
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The all-carbon fork features a molded-in lower bearing seat. The brake mounting hole isn't just raised to allow for additional tire clearance - it's also angled downward to allow room for 28mm tires under standard-reach calipers.

The all-carbon fork features a molded-in lower bearing seat. The brake mounting hole isn't just raised to allow for additional tire clearance - it's also angled downward to allow room for 28mm tires under standard-reach calipers.
(Image credit: Robin Wilmott)
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BMC team rider Thor Hushovd will be seeking a win on Sunday aboard the new BMC GranFondo GF01.

BMC team rider Thor Hushovd will be seeking a win on Sunday aboard the new BMC GranFondo GF01.
(Image credit: Robin Wilmott)
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George Hincapie (BMC) will set off from Compiègne aboard BMC's new GranFondo GF01.

George Hincapie (BMC) will set off from Compiègne aboard BMC's new GranFondo GF01.
(Image credit: Robin Wilmott)
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(Image credit: Robin Wilmott)
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BMC frame engineer Jonas Müller explains the design philosophy behind the new GranFondo GF01 - the lower section in red is designed to be very rigid whereas all of the compliance is built into the grey section up top.

BMC frame engineer Jonas Müller explains the design philosophy behind the new GranFondo GF01 - the lower section in red is designed to be very rigid whereas all of the compliance is built into the grey section up top.
(Image credit: Robin Wilmott)
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BMC says the new GranFondo GF01 exceeds all industry test standards. There is no rider weight limit and the frame carries a five-year warranty.

BMC says the new GranFondo GF01 exceeds all industry test standards. There is no rider weight limit and the frame carries a five-year warranty.
(Image credit: Robin Wilmott)
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The BB86 press-fit bottom bracket shell allows for a very wide down tube and seat tube on the new BMC GranFondo GF01.

The BB86 press-fit bottom bracket shell allows for a very wide down tube and seat tube on the new BMC GranFondo GF01.
(Image credit: Robin Wilmott)
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Wires are internally routed on the new BMC GranFondo GF01. Mechanical cables are externally run, though.

Wires are internally routed on the new BMC GranFondo GF01. Mechanical cables are externally run, though.
(Image credit: Robin Wilmott)
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The kink in the seat stays just behind the seat cluster is designed to be a flex point.

The kink in the seat stays just behind the seat cluster is designed to be a flex point.
(Image credit: Robin Wilmott)
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The novel integrated chain catcher is anchored in the bottom bracket shell and features interchangeable bits for use with standard, compact, and triple cranks.

The novel integrated chain catcher is anchored in the bottom bracket shell and features interchangeable bits for use with standard, compact, and triple cranks.
(Image credit: Robin Wilmott)
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The new BMC GranFondo GF01 carbon fork features the company's Tuned Compliance Concept design as well as a new 'angle compliance' philosophy. The kink in the legs just above the fork tips is designed to act as a flex point when hitting bumps.

The new BMC GranFondo GF01 carbon fork features the company's Tuned Compliance Concept design as well as a new 'angle compliance' philosophy. The kink in the legs just above the fork tips is designed to act as a flex point when hitting bumps.
(Image credit: Robin Wilmott)
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BMC enters a new 'endurance' category with the introduction of the GranFondo GF01.

BMC enters a new 'endurance' category with the introduction of the GranFondo GF01.
(Image credit: Robin Wilmott)
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BMC claims the new GranFondo GF01 is not only roughly 40 percent more comfortable than the current TeamMachine SLR01 but also stiffer in full frame torsion and at the bottom bracket.

BMC claims the new GranFondo GF01 is not only roughly 40 percent more comfortable than the current TeamMachine SLR01 but also stiffer in full frame torsion and at the bottom bracket.
(Image credit: Robin Wilmott)
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BMC will equip the new GranFondo GF01 complete bikes with 28mm-wide tires as standard equipment.

BMC will equip the new GranFondo GF01 complete bikes with 28mm-wide tires as standard equipment.
(Image credit: Robin Wilmott)
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It's no small feat fitting 28mm-wide tires beneath standard brake calipers but BMC has done so on the new GranFondo GF01.

It's no small feat fitting 28mm-wide tires beneath standard brake calipers but BMC has done so on the new GranFondo GF01.
(Image credit: Robin Wilmott)
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Ancillary bits on complete GranFondo GF01 bikes include Easton cockpits with compact-bend bars.

Ancillary bits on complete GranFondo GF01 bikes include Easton cockpits with compact-bend bars.
(Image credit: Robin Wilmott)
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The 27.2mm-diameter carbon fiber seatposts will be offered in 3mm, 18mm, and 30mm offsets - each with specfically designed lay-ups to maintain a consistent ride quality.

The 27.2mm-diameter carbon fiber seatposts will be offered in 3mm, 18mm, and 30mm offsets - each with specfically designed lay-ups to maintain a consistent ride quality.
(Image credit: Robin Wilmott)
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The kink in the chain stay is designed as a flex point, working in conjunction with the seat stay kink to create a sort of pseudo-linkage. Rear dropouts are intentionally offset rearward to create a moment arm that promotes movement at the flex points under bump loads.

The kink in the chain stay is designed as a flex point, working in conjunction with the seat stay kink to create a sort of pseudo-linkage. Rear dropouts are intentionally offset rearward to create a moment arm that promotes movement at the flex points under bump loads.
(Image credit: Robin Wilmott)
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BMC uses an intriguing design for the integrated chain keeper on the new GranFondo GF01.

BMC uses an intriguing design for the integrated chain keeper on the new GranFondo GF01.
(Image credit: Jonny Irick)
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These unused housing stop mounting holes are filled in with bolts but BMC says production bikes will include a more cosmetically appealing cover.

These unused housing stop mounting holes are filled in with bolts but BMC says production bikes will include a more cosmetically appealing cover.
(Image credit: Jonny Irick)
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Carbon fiber housing stops are molded into the frame.

Carbon fiber housing stops are molded into the frame.
(Image credit: Jonny Irick)
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Alessando Ballan and the rest of the BMC will use the new GranFondo GF01 at Paris-Roubaix.

Alessando Ballan and the rest of the BMC will use the new GranFondo GF01 at Paris-Roubaix.
(Image credit: Jonny Irick)
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Team riders likely appreciate the extra stiffness afforded by the extra-wide bottom bracket shell and adjoining tubes.

Team riders likely appreciate the extra stiffness afforded by the extra-wide bottom bracket shell and adjoining tubes.
(Image credit: Jonny Irick)
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A tight-ratio cassette for Alessando Ballan (BMC) to tackle Paris-Roubaix's essentially flat parcours.

A tight-ratio cassette for Alessando Ballan (BMC) to tackle Paris-Roubaix's essentially flat parcours.
(Image credit: Jonny Irick)
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The giant chain stays transmit more road buzz but that's apparently what the BMC team wanted - a stiffer feel in normal conditions but a softer ride when the going gets really, really tough.

The giant chain stays transmit more road buzz but that's apparently what the BMC team wanted - a stiffer feel in normal conditions but a softer ride when the going gets really, really tough.
(Image credit: Jonny Irick)
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Alessandro Ballan's new BMC GranFondo GF01 is fitted with a Shimano Dura-Ace-based SRM power meter.

Alessandro Ballan's new BMC GranFondo GF01 is fitted with a Shimano Dura-Ace-based SRM power meter.
(Image credit: Jonny Irick)
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Team bikes use a basic matte black finish for now.

Team bikes use a basic matte black finish for now.
(Image credit: Jonny Irick)
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The longer head tube had many BMC team riders resorting to more aggressively angled stems to replicate their positions.

The longer head tube had many BMC team riders resorting to more aggressively angled stems to replicate their positions.
(Image credit: Jonny Irick)
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Alessandro Ballan's BMC GF01 is modified to use full-length rear brake cable housing to better seal out dirt, mud, and water.

Alessandro Ballan's BMC GF01 is modified to use full-length rear brake cable housing to better seal out dirt, mud, and water.
(Image credit: Jonny Irick)
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Team bikes are fitted with Shimano Dura-Ace Di2 electronic transmissions.

Team bikes are fitted with Shimano Dura-Ace Di2 electronic transmissions.
(Image credit: Jonny Irick)
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The radical looking rear end of BMC's new GranFondo GF01 race bikes for Paris-Roubaix.

The radical looking rear end of BMC's new GranFondo GF01 race bikes for Paris-Roubaix.
(Image credit: Jonny Irick)
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Wires for electronic drivetrains enter the frame in the top tube, just ahead of the brake housing stop.

Wires for electronic drivetrains enter the frame in the top tube, just ahead of the brake housing stop.
(Image credit: Robin Wilmott)
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Even with room for 28mm-wide tires, the brake pads don't need to be slammed all the way down in the adjustment slots.

Even with room for 28mm-wide tires, the brake pads don't need to be slammed all the way down in the adjustment slots.
(Image credit: Robin Wilmott)
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The BB86 press-fit bottom bracket leaves lots of room for bigger down tubes and seat tubes, not to mention chain stay spacing that's also wider to reinforce the back end. Shimano Di2 batteries mount underneath the non-drive stay.

The BB86 press-fit bottom bracket leaves lots of room for bigger down tubes and seat tubes, not to mention chain stay spacing that's also wider to reinforce the back end. Shimano Di2 batteries mount underneath the non-drive stay.
(Image credit: Robin Wilmott)
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The new Dual Transmission Integration (DTi) refers to a convertible routing system that can be used with externally run conventional cables or internally run electronic wires.

The new Dual Transmission Integration (DTi) refers to a convertible routing system that can be used with externally run conventional cables or internally run electronic wires.
(Image credit: Robin Wilmott)

This article originally published on BikeRadar

BMC has debuted a new carbon fiber GranFondo GF01 'endurance' model that the BMC team will race this Sunday at Paris-Roubaix.

While team riders Thor Hushovd, Taylor Phinney, and George Hincapie will use the additional comfort and handling stability over the cobbles, the new bike will likely prove well suited for just about any rider looking to cover lots of distance quickly, but without beating themselves up.

Key features on the GF01 include use of BMC's Tuned Compliance Concept, as well as a new concept called 'angle compliance'. As on the TeamMachine SLR01, the new GF01 features specially shaped tube sections to promote directional flex over bumps. This is most notable in the seat stays, which are dramatically flattened from end to end.

BMC frame designers also acknowledge that from a purely geometrical point of view, merely flattening particular tube sections isn't as effective as it could be — after all, a triangle with one straight side that's thinner than the others still doesn't want to compress. Therefore, BMC have built in additional kinks at the top of the seat stays, just ahead of the rear dropouts, and just above the fork tips to act as pseudo-pivots that flex under load.

Moreover, the rear dropouts are intentionally offset rearward — creating a short moment arm — that further promotes flex when hitting bumps.

The giant chain stays transmit more road buzz but that's apparently what the BMC team wanted — a stiffer feel in normal conditions but a softer ride when the going gets really, really tough

TCC and 'angle compliance' are built into the 27.2mm-diameter carbon seat post, too, which will be available in three setbacks — the standard 18mm plus 3mm and 30mm options – each with its own specific lay-up schedule and flex pattern. Taken in total, BMC claims a 40-percent improvement in comfort for the GF01 over the SLR01 — a bike already we found to already be unusually comfortable for a race bike.

Engineering types may view the built-in flex points as areas of focused stress, but when asked by BikeRadar BMC frame engineer, Jonas Müller, insisted it's not a concern, saying GF01 frames have exceeded all industry standards and in-house tests, and moreover, there is no rider weight limit. BMC also offer a five-year warranty on the frame and fork with an optional crash replacement program for top-end models as well.

More comfortable, stiffer, but with tweaked geometry

BMC of course claims that there is no effect on overall frame torsional rigidity or drivetrain efficiency, either. In fact, BMC says internal testing shows the GF01 to actually be about 20-percent stiffer than the SLR01 at the bottom bracket and more than 30-stiffer in full torsion thanks in part to the BB86 press-fit bottom bracket, the larger 1.5in lower diameter on the tapered steerer tube (the SLR01 is 1.125in), and the correspondingly bigger down tube and seat tube profiles and more widely spaced chain stays.

Claimed frame weight for the GF01 is still less than 1,000g for a 54cm size — a penalty of less than 100g compared to the SLR01.

As is typical for this genre of bike, BMC has slightly tweaked the frame geometry for additional stability and slightly more relaxed handling. Changes relative to the SLR01 include a slightly slacker head tube angle (by about half a degree), extended head tubes by a modest 7-12mm, longer front and rear centers, and 2mm of additional bottom bracket drop though that's essentially offset by the bigger tires (more on that later).

Keeping in mind the cumulative effect of all the changes — the fork axle-to-crown length is longer, too — the effect on stack and reach are a little more significant with 8-16mm decreases in reach, and 14-19mm boosts in stack depending on size. As a result, the GF01 will offer slightly more relaxed handling but also a modestly shorter and more upright fit than BMC's more race-oriented options.

T's crossed, I’s dotted: DTi, chain watcher, and tire clearance

BMC continues the so-called 'gran turismo' theme with the ancillary features and even the standard component spec. The new DTi (Dual Transmission Integration) routing setup is designed for easily maintained external cable routing but the stops are removable (cosmetic covers will be included at production) for use with internally run Shimano Di2 or Campagnolo EPS wires. At least in the case of Di2, the battery is fixed to a dedicated mount beneath the chain stay.

The bottom bracket sports a rigidly mounted integrated chain catcher with interchangeable bits that will work with standard or compact double cranksets as well as triple setups.

One of the most impressive features on the GF01 is clearance for up to 28mm-wide tires, which will come as standard equipment on complete bikes, while still using standard-reach brake calipers. BMC raised the brake mounting holes relative to the rim as is typical for this sort of design goal but they're also cleverly angled, too.

The rest of the spec is similarly well thought out, such as tubeless-compatible Easton EA90 RT rims with 22mm-wide profiles, wider and more generously padded fi'zi:k Aliante saddles, and compact-bend Easton handlebars.

Total claimed weight for a complete GranFondo GF01 with Shimano Ultegra Di2 is just 7.38kg without pedals.

BMC isn't ready to release retail pricing on the GranFondo GF01 just yet – the company wants to wait until it's presented to dealers in a couple of weeks — but BMC road product manager Andrew James tells BikeRadar that it will be comparable to the TeamMachine SLR01.

Complete bikes in various configurations as well as a frameset option will be available following the autumn trade show season.

Check back to Cyclingnews for an upcoming first ride review of the new GranFondo GF01.