BMC’s mid-level (but race-ready) 29er hardtail mountain bike gets an all-new frame, aimed at tackling more aggressive trails without giving up the responsive power transfer it’s known for.

The brand’s Tuned Compliance Concept (TCC) uses flat seatstays, a D-shaped seat tube and post, and even the wheel and tire spec, to tame the rough stuff. A slacker head angle lets you dive in and test it, but the bottom half of the bike remains all business when it’s time to toe the line…

BMC’s new geometry

2021 BMC Twostroke mountain bike climbing

Pulling inspiration from their Fourstroke full suspension XC bike, the new Twostroke keeps the rider in an aggressive position with its 75º seat angle and short seat stays.

2021 BMC Twostroke mountain bike descending

When it’s pointed downward, a 67º head angle and 44mm offset fork help keep the wheel stable and out in front of the rider.

2021 BMC Twostroke mountain bike geometry chart

Click to enlarge the geometry chart. Four sizes are offered (S/M/L/XL).

BMC Twostroke frame details & tech

2021 BMC Twostroke mountain bike frame details

The most eyecatching part of the frame is the flattened seatstays that cut into the underside of the top tube, but there are a few other details worth noting.

The bike uses fully internal cable routing with a covered entry port on the lower, left-hand side of the downtube, making it all but invisible.

2021 BMC Twostroke mountain bike frame details

The other standout feature is the D-shaped seat tube and proprietary seatpost. It’s designed to offer some rearward flex to take the edge off bumps when you’re seated. Or, you can shim it to fit a standard round 27.2 dropper seatpost.

And integrated chain guide sits above the chainring, and three bottle cage bolts on the downtube let you choose between a low single bottle position, or adding a bottle on the seat tube, too.

BMC Twostroke pricing and models

BMC Twostroke 01 mountain bike specs and white frame color

Interestingly, BMC opted to keep the entire range of bikes affordable, forgoing ultra high-end build kits…likely because they’re reserving those for their soft-tail Teamelite (which, BTW, hasn’t seen a real update since 2015, so our money’s on an updated version of that coming soon!)

The Twostroke 01 ONE (above) is the most expensive at $4,299 (€3,999) and gets a mostly SRAM GX Eagle group with X1 (non-series) carbon cranks and X01 rear derailleur, and SRAM Level TLM brakes. DT Swiss XR 1700 wheels and Vittoria Barzo 29×2.25 tires round out the package. Claimed weight is 9.33kg.

BMC Twostroke 01 TWO mountain bike specs and orange frame color

The Twostroke 01 TWO comes in at $3,299 (€2,999) and gets a full GX Eagle group with Level TL brakes. Claimed weight is 9.7kg.

BMC Twostroke 01 THREE mountain bike specs and blue frame color

The Twostroke 01 THREE runs a GX/NX/SX Eagle mix with Shimano Deore BR-6100 brakes, Shimano hubs and Alex rims for $2,699 (€2,499). Claimed weight is 11.46kg.

BMC Twostroke 01 FOUR mountain bike specs and black frame color

The least expensive carbon “01” level model (all of these share the same carbon frame) is the Twostroke 01 FOUR with a Deore 1×12 group and MT200 brakes. Retail is $2,199 (€1,999), and claimed weight is 11.46kg.

Below this are two alloy models for $1,599 (€1,599 with NX Eagle) and $1,199 (€1,199 with Deore).


    • Frank on

      I agree. I love the downcountry style 67 degree head angle but the inability to run a 30.9 or 31.6 seat post means the bike is practically limited to 125mm of drop.

  1. Craig on

    Almost the perfect hardtail. But what were they thinking with that ridiculous proprietary seatpost shape!!! They’ve really missed the mark on this. I’d actually like to buy this bike but a 27.2mm dropper and a shim really puts me off. Everything else about the bike is awesome. Hey BMC leave the proprietary BS to Cannondale.

    • threeringcircus on

      Completely agree. The gimmicky seatpost shape is a bummer. I can’t imagine you would get (or want) more flex from a D-shaped post than from a round 27.2mm post like the Syntace P6.

  2. IzzyM on

    How do the wheel and tire spec help to “tame the rough stuff?”
    How wide are the spec’d rims and what’s the widest tire that can fit in the back?

  3. koen on

    Looks sick, but the proprietary seatpost will be a huge turn-off for most people. I can’t believe with all that research and brain power they are unable to understand something so simple.

  4. Nick on

    The design intent was clearly to introduce as much compliance as possible, hence the flat seat stays and proprietary seatpost, and the “TCC” naming. A dropper post can still be used with the shim, but the use of a dropper would add considerable stiffness to the system, which defeats the purposet. Besides, XC riders generally do not need or want excessive travel in their seatpost, so a 27.2 dropper would be sufficient anyway.

    I just got a new bike this year, but this one looks great, and the price is not bad. I might have to get one in the next year or two, because I love the idea of having a low maintenance hardtail, as long as it doesn’t beat my back up.

  5. Anders D on

    Picking up this tread again since I am in the considering process of getting a MTB (up to now I am glued to the road). The 01 Four is on my list, on top I think. Since one year has past, anyone got one and what is your experiences/recommendations?


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