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Open
0-1.0 Frame

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Open your mind.

The brand name Open is, well, open to interpretation. We like to think it signifies open-mindedness to the approach of MTB frame design and construction, and supporting evidence can be found all over the Open O-1.0 frameset.


Open started with carbon fiber itself. There are many myths surrounding carbon fiber, one being that the more "high-modulus" carbon fiber you use in constructing a frame, the better. The simple fact is that though high-modulus carbon is stiffer, it's also more brittle, and thus, not ideal when applied to certain areas of the frame where pliability is important. For the O-1.0, Open used stiffer, lighter carbon where it made sense, and stronger carbon where it was needed, like in the tapered 1-1/8 to 1-1/2in head tube. Open calls this blended approach TRCinTRS, for The Right Carbon in The Right Spot, a tongue-in-cheek nod to the industry's love affair with acronyms. The result of the TRCinTRS approach was the creation of the lightest mountain bike frame ever (871 grams for a size M, lighter than many road frames) to pass the German company EFBe's structural integrity tests, which are some of the most rigorous in the world.


Another myth that Open was determined to put to rest is that carbon mountain bikes can't have a compliant feel. This latest generation of the O-1.0 benefits from larger, stronger seatstays for improved rear-end tracking and responsiveness, but ride comfort hasn't been sacrificed. The seatstays are still notably vertically thinner than most on the market, while being very laterally wide, the intent being to allow the frame some vertical compliance under trail chatter or larger impacts, bestowing comfort without giving up lateral rigidity. Still, Open didn't want to create a Buick of a frame, because they rightfully point out that most vertical compliance in a hardtail comes from the bike's tires.


Looking at the geometry of the O-1.0, it's clear that Open sought to prioritize nimbleness while taking advantage of the rolling advantages that 29in wheels provide. The short, 17.3in chainstays create agile handling, as does the relatively steep 72 degree head tube angle. While the seat tube angle appears to be slacker at 72.5 degrees, the seat tube is designed to accept a 27.2mm, zero-setback seatpost, which would compensate for the slacker angle, and save a modest amount of weight. Also new this year is the introduction of a PF30 bottom bracket interface, which Open determined to afford the best combination of weight savings and power transfer.


The new O-1.0 has some final touches that demonstrate the forward thinking and attention to detail this frame received. Open used direct-mount S3 front derailleur posts to eliminate the need for a clamping front derailleur that could damage the seat tube. The mounting posts for the rear brake are located on the chainstay rather than the seatstay, a logical innovation considering that chainstays are, by necessity, more rigid than seatstays, bolstering braking performance. To protect your investment, an alloy chainstay protector has been added, and the included FrameSaver derailleur hanger is bolted on from the inside of the dropout, which puts the bolt threads in the hanger rather than the frame.


The Open O-1.0 Carbon Mountain Bike Frame accepts most rear tires up to 2.25 inches wide, and its cabling is routed internally. It employs a PF30 bottom bracket standard and a 10x135mm quick-release rear axle. It comes in the color Black and in sizes Small through X-Large.


Frame Material
carbon fiber
Suspension
hardtail
Head Tube Diameter
1.125-1.5 inch
Headset Included
yes
Bottom Bracket Type
PF30
Cable Routing
internal
Front Derailleur Mount
S3 low direct mount (e-type)
Compatible Components
SRAM, Shimano
Seatpost Diameter
27.2 mm
Seat Collar
included
Rear Axle
135 mm quick release
Recommended Use
cross country
Manufacturer Warranty
3 years

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