Crupi BMX

Crupi OS20 2.0 Pro XL Race Frame

Regular price $779.99 USD
Frame Color: White
Decal Color: with BlackWht Fade decals

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Crupi OS20 2.0 Pro XL Race Frame
$779.99 USD
White / with Blac...
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Crupi OS20 2.0 Pro XL Race Frame


Description

The Crupi OS20 2.0 Pro XL Race Frame is a fully redesigned, all-American hand-built BMX race frame engineered for serious competitors who demand stability and speed. Built around the oversized 451mm (OS20) wheel standard, this frame delivers the extra rolling diameter and planted feel that aggressive racers rely on to gain an edge on the track. With a 21.5" top tube, it is sized for riders 5'4" and taller, providing the reach and control needed for powerful sprints and confident handling.

This latest 2.0 version brings key upgrades including wrap-around seat stays, a shorter seat tube profile, and a fully integrated built-in Disc Adapter - eliminating the need for bulky axle-mounted adapters. Constructed from seamless drawn 6061 T6 butted aluminum with race-proven geometry, the OS20 2.0 Pro XL is a frame built to win, made right here in the USA.


Key Features

  • OS20 Oversized Wheel Compatibility: Designed for 451mm rim/tire size, offering greater stability and a larger rolling diameter compared to standard 406mm BMX wheels.
  • 21.5" Top Tube: XL sizing designed for riders 5'4" and taller for optimal reach and race geometry.
  • 6061 T6 Butted Aluminum Tubing: Seamless drawn construction with squared-off tube ends for maximum welding surface and frame integrity.
  • Wrap-Around Seat Stays: Updated 2.0 design for a stiffer, more responsive rear end feel on the track.
  • Built-In Disc Adapter: Integrated into the frame - no axle-mounted adapters required. Compatible with Tektro, TRP Evo, TRP Slate, and all Shimano hydraulic disc brake kits (120mm rotor required; Hope, Avid, and mechanical kits do not fit).
  • Teardrop Chain Stay Tubes: Shaped for a stiff and strong rear end, improving power transfer and overall rigidity.
  • Square Down Tubes: Larger diameter square-shaped down tubes add stiffness and strength throughout the front triangle.
  • Parallel 3/8" (10mm) Axle Slots: Ground-parallel dropouts ensure frame geometry remains consistent regardless of rear wheel position.
  • Thicker 3D Dropouts: Extra stiffness for disc brake use while still accommodating standard chain tensioners for easy wheel installation and adjustment.
  • Pro Taper Head Tube & EB24 Euro BB: Level 2.0 spec includes a Pro Taper head tube and traditional EB24 Euro bottom bracket standard. Compatible with most standard Pro 20" forks - no OS20-specific fork required.
  • V-Brake Posts Included: Brake posts are retained on the frame for riders who prefer V-brake setups.
  • Hand Built in the USA: Every Crupi frame is individually hand built in the United States.

What's Included

  • Crupi OS20 2.0 Pro XL Race Frame

Why You'll Love It

Crupi has been a trusted name in BMX racing for decades, and the OS20 2.0 Pro XL represents the brand at its very best - refined, race-tested, and proudly made in the USA. The integrated disc adapter and updated seat stay design show that Crupi is constantly evolving to meet the demands of modern BMX racing without compromising the proven geometry that has taken riders to the podium. For taller riders who want the stability and performance benefits of the OS20 wheel format, this frame is one of the few purpose-built options on the market. The premium 6061 T6 butted construction means you're getting a lightweight yet durable platform that can handle the punishment of gate starts, rhythm sections, and jump sequences lap after lap. Whether you're racing at the local track or competing at a national event, this frame delivers the confidence and consistency you need to perform at your peak.


Product Specifications

View Product Specs
Top Tube Length 21.5"
Wheel Size 451mm (OS20 Oversized 20")
Frame Material Seamless Drawn 6061 T6 Butted Aluminum
Bottom Bracket Standard EB24 Euro BB
Head Tube Pro Taper
Axle Slot Size 3/8" (10mm), parallel to ground
Disc Brake Compatibility Tektro, TRP Evo, TRP Slate, all Shimano hydraulic kits (120mm rotor required)
Disc Adapter Built-in (Crupi Disc Adapter Kit required, sold separately)
Rotor Size 120mm
Rider Height Recommendation 5'4" and taller
Origin Hand built in the USA
Frame Only (no fork included) Yes

FAQ

What does "OS20" mean and why would I choose it over a standard 20" BMX frame?

OS20 stands for "Over-Sized" 20" and refers to the 451mm rim/tire diameter - slightly larger than the standard 406mm BMX wheel. The bigger wheel offers more stability, a larger contact patch, and increased rolling diameter, which can translate to a speed advantage down long straightaways and smoother rolling through rough sections of track. Racers who prefer a more planted, stable feel over the nimbleness of the smaller standard wheel often gravitate toward OS20 setups.

Do I need a special OS20 fork to run this frame?

No - while the frame geometry was based around the Answer Dagger OS20 fork, most standard Pro 20" forks are compatible with the OS20 wheel. You do not need to source a hard-to-find OS20-specific fork to build this frame up.

Which disc brake kits are compatible with the built-in Disc Adapter?

The built-in disc adapter is compatible with Tektro, TRP Evo, TRP Slate, and all Shimano hydraulic disc brake kits when used with Crupi's Disc Adapter Kit and a 120mm rotor. Note that Hope, Avid, and all mechanical disc brake kits are NOT compatible with this system.

Is the Crupi Disc Adapter Kit included with the frame?

No - the Crupi Disc Adapter Kit is sold separately. You will need to purchase it in addition to this frame to use hydraulic disc brakes. A 120mm rotor is also required for proper fit.

Can I still run V-brakes on this frame?

Yes - all Crupi frames retain brake posts, so the OS20 2.0 Pro XL is fully compatible with standard V-brake setups if you prefer that over disc brakes.

What if the color or size I want is out of stock?

Crupi frames are hand built in the USA in limited quantities and do sell out regularly. If your preferred color or configuration is not currently available, contact Crupi directly to be placed on their priority list - when that frame becomes available, priority list customers get first access.

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