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What is XX?

The XX grade is the highest grade in pursuit of "perfectness" in every part of the frame.

Seven Cycles starts by identifying all potential elements that can be improved from each part of the frame, disregarding the cost, measuring and selecting those cost-effectiveness, and integrating nine really reasonable customizations as options. I made it into one package.

The bicycle industry has been using "lightness" for sale as its sales strategy for decades, but on the contrary, the frame has been increasing in weight almost every year. The evolution of components has increased the weight of the bike with the required specifications such as disc brakes, through axles, tapered column forks, wide tires, etc.

For XX grade bikes, rethink every corner of the frame and scrape off the extravagant flesh hidden in the list of areas the industry has "improved" over the last decade. Based on the proper know-how and design unique to Seven's thousands of production records, all new build techniques that have passed durability tests will be applied to XX bikes.

The advantage of the XX bike is even better than the SL grade without sacrificing its performance or durability.113 g ~ 311 g Light frameCan be assembled into. Seven considered the weight of each part in grams to realize this ultimate custom frame. In grams, not ounces.

Below are eight designs that make it possible.

1. Asymmetric Fastback Dropouts

The non-drive side uses a standard flat mount dropout, but by combining an asymmetrical design through axle dropout on the drive side,Weight reduction of about 60 gramsTo realize.

The dropout on the non-drive side has a brake caliper pedestal, so the length from the center of the axle to the end of the brake rotor, that is, about 10 cm, is required. This is a very long dropout, much heavier than a tube of the same length. On the drive side, on the other hand, a dropout of 4 cm from the axle is sufficient. The asymmetrically designed dropout is not only lightweight, but also stiff. (Seven dropouts are the most rigid in the industry)

2. Asymmetric Chain Stay

Asymmetric chain stayWeight reduction of about 6 gramsAt the same time, it increases the rigidity of the drive train.

Since the dropout originally requires a chain stay with independent left and right design, the performance can be raised to the limit by appropriately designing the clearance to parts such as the chain ring, tire, and crank on each of the drive side and non-drive side. I can. The benefit of this asymmetrical design is that the weight reduction of a few grams is a bonus, and the rigidity is greatly increased.

3. Modified BB Shell

By cutting further into the BB shellApproximately 14 g lighterTo do. This has no adverse effect on the frame.

At Seven, cutting / threading to the BB shell is performed after welding. This creates a truly distortion-free platform, but by applying a higher level of processing than usual in this CNC cutting process, excess mass is scraped off without compromising durability or rigidity.

4. Modified Breather Hole

All tubing that makes up the frame has holes called breather holes that allow the inert gas required for welding to pass through. Expand this hole to the maximum without compromising durability and rigidity,Weight reduction of about 12 gAchieve. It's a part that can't be seen from the outside, but I won't cut corners.

5. XX Tube Butting

By butted processing on the tubeWeight reduction of about 30 to 45 gIt will be.

Seven has introduced a new butted processing system, which makes it even lighter on average by about 40 g than the original butted processing that has been repeatedly refined.
Of course, this processing is optimized based on the type and purpose of the frame, input from the rider and body specifications.

6. Tube Profile

By arranging the selection of tubes that make up the frame and their profiles (diameter, wall thickness, etc.)30-60 g lighterAchieve.

When upgrading to the X-series, Seven's unique approach maximizes the true potential of US-made titanium tubing.

7. Flat Mount Brake Adapter

Seven original flat mount brake adapter is further cut down without impairing braking force and responseWeight reduction of about 13 gTo do.

8. Compact Frame Design

By making the frame design slightly compact,Weight reduction of about 18 gTo realize.

The sloping of the top tube is increased by about 2 degrees from the standard design of Seven. This increases the rigidity, and it is possible to scrape off excess parts in various places.

Thinking More Deeply About Weight

There are three effects of reducing the weight of the frame (or component) on the bike.

1. Improves performance.
The lighter it is, the better it accelerates, the better it stops, and the easier it is to control. Instead of turning by steering, it becomes easier for you to turn with your body.

2. Lighter weight can increase suppleness.
Being supple can be a good thing, but it is often considered a bad thing. For example, early titanium bikes were rated "too soft" because of their material properties. In particular, the evaluation of a bike that lacks lateral rigidity is negative. On the other hand, the vertical supple bike shows excellent characteristics in terms of traction and followability, and riders of all performance levels appreciate its shock absorption performance and supple and comfortable ride.

3. Generally, weight reduction is an act of shortening the life of a product.
Certainly, products that put lightness first will cause many warranty issues.
All Seven frames come with a lifetime warranty. This also means that Seven has not made any weight reductions that would shorten its useful life. This is also the reason why Seven bikes have never been the lightest on the market in history. Seven Cycles is not interested in weight reductions that reduce durability and safety.

In pursuit of lightness, the bike has the above three effects.

In shaping the XX grade, Seven has carefully avoided issues related to durability and product life while successfully incorporating the advantages seen in 1 and 2 above. The underlying goal of the design is to achieve weight reduction without sacrificing the rigidity and performance of the frame, making full use of the butted processing technology cultivated over many years, and the "best" that riders demand. It is a response at a higher level.
(* XX bikes cannot be carrier / rack mounted and are not recommended for riders who require an ultra-rigid drivetrain (9 or 10 on a stiffness rating scale))