Chase Rsp 5.0 Os20 Frame Black / Grey

Chase RSP 5.0 OS20 Frame Black / Grey

Product Overview

The Chase RSP 5.0 OS20 is a premium aluminum BMX frame engineered with oversized wheel geometry for larger riders. Featuring tapered headtube, internal cable routing, enclosed dropouts, and disc brake compatibility, it delivers responsive handling and modern braking performance specifically optimized for OS20 (oversized) wheel and tire systems.

Key Features

• 7005 T6 Premium Ultralight Aluminum — Hydroformed and muscle-formed tubing provides optimal strength-to-weight ratio with reduced material thickness in non-critical zones
• Double and Triple Butted Tubes — Variable wall thickness concentrates material in high-stress areas, balancing lightweight construction with structural integrity
• Internal Cable Routing — Integrated housing path runs from headtube through downtube and bottom bracket, exiting chainstay (Expert XL+) or downtube (Mini-Expert), improving aesthetics and protecting cables from impact
• Tapered Headtube Geometry — Expert XL and larger sizes feature 1-1/8" to 1.5" tapered steerer acceptance, increasing headtube stiffness while maintaining standard headset compatibility
• Disc Brake Optimized Design — Restructured dropouts provide enhanced clearance for diverse disc brake calipers; compatible with both post-mount and flat-mount systems (adapter required)
• Enclosed Rear Dropouts — 3/8" (10mm) closed dropouts with integrated tensioners provide secure wheel retention and precise alignment
• CNC Machined Dropouts — Precision-engineered construction ensures accurate wheel alignment and durability under racing and technical riding stress
• OS20 Specific Geometry — Refined frame geometry optimized for oversized 20" wheel and tire systems, providing increased tire clearance and comfort for larger riders
• Aero Seat Post Tube — Integrated aero profile reduces aerodynamic drag while providing structural stiffness benefits
• Professional Race Heritage — Evolution of the RSP frame platform used by Connor Fields and Joris Daudet, refined through professional feedback and testing
• Premium Finish — Matte black with grey accents for distinctive visual presentation

Technical Specifications

• Material: Aluminum 7005 T6 (premium ultralight)
• Construction: Double butted hydroformed top tube, triple butted hydroformed downtube, muscle-formed rear stays
• Headtube Options: 1-1/8" integrated (Mini, Junior, Expert); 1-1/8" to 1.5" tapered (Expert XL and above)
• Bottom Bracket: Euro BSA 68 (Mini, Junior, Expert); Press Fit BB 86 (Expert XL and above)
• Rear Axle: 3/8" (10mm) closed dropouts with integrated tensioners
• Brake System: Disc brake only; post-mount and flat-mount compatible (adapter required)
• Cable Routing: Internal from headtube through downtube, exits chainstay or downtube depending on size
• Wheel System: OS20 specific (oversized 20" compatibility)
• Available Sizes: 20" (Mini, Junior, Expert, Expert XL, Pro, Pro+, Pro XL, Pro XL+, Pro XXL, Pro XXL+, Pro XXXL, OS Pro XXL, OS Pro XXXL); 24" (Cruiser Pro, Cruiser Pro+)
• Finish: Matte black with grey accents

Included & Not Included

• Included: Chain tensioner and bolts, housing damper foam
• Sold Separately: Aero seat post clamp, aero seat post, disc brake adapter, brake housing

Compatibility and Ideal Use Cases

Compatible with disc brake systems using post-mount or flat-mount adapters (Elevn brand recommended). Requires OS20-specific fork for correct frame geometry and front tire clearance. Ideal for larger riders seeking refined geometry optimized for oversized wheel systems. Suited for riders prioritizing comfort, tire clearance, and responsive handling in oversized format. Recommended for professional and advanced competitors, larger-frame athletes, and those building dedicated OS20 complete setups. The internal cable management and closed dropouts provide clean aesthetics and secure wheel retention for racing and technical riding applications.

DOWNLOAD RSP 5.0 FRAME BRAKE SETUP NOTICE

Please note: Brake fluid on paint that is not silicone-based can act like a paint thinner and eat away at the coating of your paint, causing it to peel. Due to different types of paints/decals/materials used for BMX parts, do not let the Brake Fluid touch any part of the bike, as there can be significant self infliced damage due to this.

Integrated Tapered Head Tube
For stiffer tapered steer tube fork

NEW Integrated Cable Routing
Routed from head tube to chain stays

NEW Restructured Enclosed Dropouts
To offer better clearance for a wide array of disc braking with internal built-in tensioners

Aero System shape
To improved aerodynamics and a slightly stiffer feel.

Press Fit Integrated BB86 Bottom Bracket
Simple and easy way to install

Born from some of the best alloys for building BMX race bikes, our special 7005-T6 SpeedLite alloy is the perfect blend for our Hydroforming process, giving the RSP frames the core strength needed to produce unmatched speed on the track, while keeping the overall weight of the frame down to a minimum.

Chase utilizes the triple butting on our line of RSP 5.0 frames. A triple-butted tube means it has three different wall thicknesses along its length. Chase uses this technology to reduce the amount of material used when building the RSP 5.0 frame, decreasing its weight by 15% compared to last years frame tubes used to construct the frame. Lighter where it can be and stiffer where it needs to be means no excess weight on the bike that gives you an advantage with the RSP 5.0 frame and against the completion.

Chase utilizes tapered tubing to offer you the most durable, yet light weight products, to help you achieve optimum results on the BMX race track. Our tapered items, use multiple thicknesses in the same tube, so the tube can be reinforced where needed with precision to help reduce stress areas where needed and lighten up the areas that don’t require extra materials. In aluminum the result are tube walls that eliminate stress points, boosting strength, reducing weight and improving fatigue life. The advantage is clear : Tapered tubes enhances strength and durability, at less weight.

Hydroformed tubes have two main advantages. First, the narrow axis is a flatter surface, which means more surface area to carry the load, so it is stiffer & stronger across the minor axis. Secondly, the deeper axis is stiffer since the stiffness varies to the cube of the diameter, stronger to the square. When using an oval shaped tube on a typical BMX frame it helps reduce flex but only in one direction, but on the Chase frames, the tubes are oval in both directions in the main flex areas and these tubes help reduce flex in both main directions.

Chase RSP 5.0 Frames feature the Aero seat post tube, seat post, and seat post clamp into BMX racing. This is to not only to help gain fractions of a second on the track with improved aerodynamics, but the Aero tubes also offers a slightly stiffer feel. We know BMX bikes don’t need to go fully aero testing into a wind tunnel, but when races are won or lost by fractions of a second, every advantage will help.

All Chase Frames feature Muscle Forming for Chain and Seat Stays, a technique to give the back end of the ACT & RSP frames the stiffness and design shape we wanted and needed for optional design a special mold and process were needed to let us build the ultimate frame. Used with Carbon Fiber or Alloy to do just that, while letting us design the exact shape, design, and thickness to offer the optional designed back end on the Chase frames.

For the Chase RSP 5.0 frames, we have restructured the dropouts to offer better clearance for a wide array of disc brake calibers, improving the overall braking performance. Like the RSP 4.0, we have designed them to be able to take the extra force created by using a disc brake and disc brake mount, now compatible for both post mount & flat mount disc brake system.

While each rider is unique, Chase has developed Bio Fit sizing for our frames to offer riders the ultimate size options for BMX racing. The sizing used for the Chase line has been carefully designed to give riders the optimum power output in the size range offered. Our commitment to details and offering many size options, gives you a custom fit BMX frame, that you can buy right at your local Chase BMX Dealer..

Chase RSP 5.0 Frames use a Integrated Tapered Headtube. Tapered head tubes offer a combination for the bearing sizes. Our tapered head tubes have a 1-1/8” upper diameter to 1.5” lower diameter. this allows you to run a tapered steer tube fork, or use a full 1-1/8” fork steer tube, with the offered 1.5” lower bearing, when the headset has an optional 1-1/8” to 1.5” fork race option.

Chase RSP 5.0 Frames use a Press Fit style Bottom Bracket tube. Press Fit BB are a simple and easy way to install a Bottom Bracket, where the Bottom Bracket you supply for your frame has the Bearings in cups and simply press into the frame, eliminating the chance of damaging BB threads, with the traditional Euro BB. The BB is usually lighter and easier to install and remove as well.

Chase RSP 5.0 Frames feature an Fully enclosed, Extra long (2.3″ or 60mm) axle area slot, 10mm drop outs. The Enclosed system also houses an Internal system with built-in alloy tensioner, allowing you to use the full length of the dropout.

Chase RSP 5.0 Frames feature new Internal Cable Routing from the Head Tube, through the Down Tube & Bottom Bracket, and exits out of the Chain Stay (exits out of the bottom of the down tube for small sizes), giving you the factory look, as well as providing protection for the brake cable and graphics, since the cable does not rub against the frame.

GEOMETRIES :

NOTE: RSP 5.0 frame weights listed are weighed exactly how the frames arrives to you, with paint, decals, & clear coating.