gravel titanium bike S-PARTS Titanium Alloy Gravel Bike Frame
SKU: 2916352719
gravel titanium bike

gravel titanium bike S-PARTS Titanium Alloy Gravel Bike Frame

Sale price$19.41 Regular price$21.57
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Description

gravel titanium bike S-PARTS Titanium Alloy Gravel Bike FrameWHY GRAVLE? At the inception of designing the first mass produced titanium alloy bike frame for S PARTS, we contemplated two questions: What type of bicycle is best suited for titanium alloy construction? What kind of riding experience and lifestyle should an exceptional titanium alloy bicycle provide? [Choose, Think, Create] Titanium's inherent mechanical properties provide a perfect balance between torsional rigidity and vertical damping. It ensures


WHY GRAVLE?

At the inception of designing the first mass-produced titanium alloy bike frame for S-PARTS, we contemplated two questions:

  1. What type of bicycle is best suited for titanium alloy construction?
  2. What kind of riding experience and lifestyle should an exceptional titanium alloy bicycle provide?

[Choose, Think, Create]

Titanium's inherent mechanical properties provide a perfect balance between torsional rigidity and vertical damping. It ensures the lateral stiffness needed for high power output during pedaling while absorbing vertical bumps from various complex terrains and filtering high-frequency vibrations. This makes it not only suitable for paved roads but also destined to break free from urban constraints and race through the wild. Whether it's short sprints or long journeys, these are its specialties. This reliable titanium alloy companion is always ready to join you on an adventure, embracing the mountains and rivers that await.

That's why "Gravel" is the most beautiful interpretation of a titanium bike.

CROSS CONTROL SYSTEM 2.0

This is the crowning design that we have meticulously developed and finally achieved for mass production. Years ago, when S-PARTS began its custom titanium frame business, we insisted on using a design where the seat stays connect to the top tube, which we termed "CROSS CONTROL" technology. This method effectively uses the passive deformation of metal to absorb road bumps in non-suspension frames. However, due to early technological limitations, we had to conservatively weld the connection between the seat stays and the seat tube. While this ensured the frame's strength, it significantly compromised the original goal of vertical shock absorption, which was undoubtedly frustrating.

For years, this issue has been on our minds, and the S-PARTS team never gave up on finding the optimal solution. In 2023, we introduced new hydraulic bending equipment and internationally advanced calibration and testing instruments. With these resources, we ventured into more daring tube and profile designs, using 3D software to simulate a completely disconnected structure between the seat stays and the seat tube, which we successfully achieved in simulations. This led to the creation of the "CROSS CONTROL 2.0" system we have today.

We chose slimmer seat stays, internally hydroformed to maintain support strength while providing ample clearance. This design allows for controlled physical deformation on rough roads, achieving the intended shock absorption function. To increase the contact area and vertical support strength at the weld points between the stays and the top tube, we used a special vertical pressing mold at both ends of the top tube. This created two elliptical cross-sections—one horizontal at the head tube and one vertical at the seat tube—achieving both aesthetic and functional benefits.

ASYMMETRIC REAR FORK

Traditional metal frames, when requiring compatibility with both large chainrings and wide tires, usually compress the drive-side chainstay to form a dent. This is an unavoidable compromise that inevitably damages the original tube wall structure, resulting in a loss of strength.

S-PARTS designed a connector CNC-carved from a single piece of titanium alloy plate, perfectly solving this issue in multiple ways:

  1. The solid titanium alloy connector provides higher connection strength than tube materials, ensuring drive-side pedaling rigidity.
  2. The 6mm wide plate offers considerable installation space for both tires and chainrings, allowing the GRAVEL frame to accommodate tires up to 42c and chainrings up to 48t.
  3. The asymmetric recessed design also provides more chain movement space, significantly reducing the chance of chain-to-chainstay collisions during extreme bumps.

Internal cable routing / CNC rear dropout / UDH derailleur hanger / T47 bottom bracket

The frame features a 52mm integrated headset with uniform diameter, supporting ACR and DCR systems for fully internal cable routing with both integrated and non-integrated handlebars.

The fully CNC-machined flat mount brake caliper installation base ensures high strength and precise mounting holes for quick and accurate setup, delivering sharp and powerful braking performance.

The entire series is equipped with the UDH direct mount dropout system, compatible with nearly all rear derailleurs on the market.

The T47 threaded bottom bracket, standard across the series, is the optimal solution for metal frames, offering excellent stability, pedaling stiffness, and minimal noise risk. For 24mm spindle specifications, it supports a fully hidden brake hose routing solution within the bottom bracket shell.

Frame Assembly Guidelines

Head Tube: Use upper and lower 52mm integrated bearing headsets, ensuring compatibility with ACR or DCR system internal cable routing.

Fork: Optimal fork specifications for this frame are a length range of 389-400mm (excluding suspension forks), an offset range of 48-55mm, and a maximum tire clearance >42c.

Bottom Bracket and Crankset: The frame's bottom bracket shell width is 68mm and requires a T47 external bearing bottom bracket. The specific model depends on the crankset used; please consult your retailer or S-PARTS official customer service. The frame supports a maximum chainring size of 48T.

Shifting and Braking: The frame is compatible with DI2, AXS electronic shifting systems, and similar electronic shifting products (not compatible with any mechanical shifting systems). The frame only supports FLATMOUNT disc brake systems.

Seat Post: Only compatible with 27.2mm diameter round seat posts.

Wheelset: Only compatible with 700c wheel specifications and 12mm thru-axle road wheelsets.

 

Gravel frame fatigue test report - Chinese

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 2916352719

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4.3 ★★★★★
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Rhbones
Lowell, US
★★★★★ 5
Works for my 2011 115hp Etec
Size: For 75-250 HP
Exact fit and cheaper than a trip to a repair shop. Make sure you have the proper gasket sealer, a good scrapper that's not going to dig into the sealing surface, and tools for the job. I went on my computer and downloaded a video that walked me through the process. I'm a mechanic by trade but wanted to ensure everything was correct. I've been running the motor now for a couple of months. Peeing just as it's supposed to. No more delivering, waiting, and retrieving my boat from the shop for its routine service. Just follow your owner's manual to make sure you do all the necessary maintenance.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2025
C
Verified Purchase
Chelsey R
Belleville, US
★★★★★ 5
Great replacement
Size: For 5.5HP 6HP 7.5HP
Works as it should. Easy to swap out.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2025
D
Verified Purchase
Dan
Chelsea, US
★★★★★ 5
Works
Size: For 60 65 70 75 HP
Works great
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
B
Verified Purchase
Billy kinney
Alexandria, US
★★★★★ 4
Great product
Size: For 85-300 HP
Complete rebuild kit for $38 and great quality and fast delivery
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Reviewed in the United States on August 30, 2025
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Verified Purchase
grog
San Leandro, US
★★★★★ 5
If pump doesn't seem to work
Size: For 85-300 HP, Size: For 85-300 HP
Hi....I apologize it took me a while to get back to you with my results. Here is what I discovered about the pump and will also apply to some of the other comments I read in the reviews with people not getting the pump to work: 1.) I removed the pump to check the proper direction of the impeller and it was correct as can be seen in the photo. 2.) I built a pump shaft attachement so that I could operate the pump with a power drill. 3.) I attached the water muff to the unit and tried to pump water.....it wouldn't do so. What I did see however was that even at high hose discharge and small leakage at the muff I could not fill the water cavity in the housing. 4.) I installed a strap around the muff and tightened it very tight and THEN at high hose pressure I was able to get the cavity to fill with water. 5.) At that point I activated the drill and was able to get the pump to actually pump water. I then removed the pump housing and removed the O-Ring that resides on top of the impeller, reassembled and it would not pump water. Since the O-Ring sits higher than the original does I wanted to make sure that it was necessary to have it in the pump. 6.) I reassembled the engine and kept the tight strap on the bottom and finally it pumped water into the engine. My conclusion that you can reply to other buyers if they have a problem: Do NOT underestimate 2 things....1.)the lack of ability of the pump to draw water up AND 2.)the fact that if the muff leaks it will NOT fill the cavity when common sense says it should. This was a 120hp Johnson. The engine bottom must be immersed fully or the muff must be very tight on the lower unit for the pump to function. Please feel free to post this if you wish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2024

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