JAGWIRE 4MM HOUSING STRAIGHT ENTRY FOR 8.0MM ROUND FRAME PORT
Keep your internally routed frame neat, quiet, and completely shielded from the elements.The Jagwire 4mm Housing Straight Entry Frame Plug is a premium workshop-grade solution engineered for modern bicycles with internal cable routing setups. When routing premium 4mm gear shifting housings through your frame, open ports can leave unappealing gaps that let in dirt and moisture. This specialized grommet slides straight over your outer housing to cleanly bridge the gap, providing a factory-fresh finish.
Crafted from a highly durable, automotive-grade EPDM rubber compound, this plug is precision-molded to press-fit firmly into standard 8.0mm round frame entry and exit ports. Because it features an integrated, tight-tolerance 4mm central channel with a perpendicular straight-line entry pathway, it holds your shift housing securely in place to eliminate annoying frame rattles. This tight interface creates an effective barrier against water ingress during wet winter commutes, muddy trail rides, or routine bike washing, significantly extending the life of your internal cables.
Key Features
4mm Shifting Compatibility: Designed with a precise internal diameter tailored to slide smoothly over standard 4mm gear outer cable housings.
8.0mm Round Port Architecture: Precision-molded outer ribbing engineered to deliver a snug, secure press-fit inside standard 8.0mm frame ports.
Perpendicular Straight Entry: Features a direct, inline orientation that guides cable housings straight into the frame tubes cleanly.
Premium EPDM Rubber Material: Crafted from a tough, high-density rubber compound that resists cracking, weather rot, and harsh workshop degreasers.
Rattle-Eliminating Fit: Locks your shifting housing tightly to the frame chassis, preventing annoying internal cable noise over rough terrain.
Specifications
Position on Bicycle: Frame tubes (Down tube, top tube, chainstays)
Installation: Press-fit push insertion
Material: Weather-resistant EPDM rubber
Plug Profile Type: Straight entry / Open cable guide
Port Hole Shape Compatibility: Round
Frame Port Diameter Compatibility: 8.0mm
Housing/Hose Compatibility: 4.0mm outer diameter (OD)
Manufacturer Part Number: CHA164
Removable: Yes
✅ Why This Product IS For You
Custom Mechanical Shifting Builds: Perfect if you are running standard mechanical gear systems or traditional dropper posts that require a clean guide for 4mm housing.
Eliminating Annoying Frame Noise: Ideal for mountain bikers and gravel riders who are tired of hearing their internal cables slam against the inner frame tubes on rough trails.
Factory-Quality Restorations: Great for workshop mechanics and home builders who want to replace lost or brittle factory grommets with an OEM-quality finish.
❌ Why This Product May NOT Be For You
Thick Hydraulic Brake Hoses: This plug features a strict 4.0mm inner channel; it cannot accommodate thicker 5.0mm or 5.5mm hydraulic brake lines.
Tight Angled Cable Routing: Because this is a straight-entry plug, it is not ideal if your frame ports require cables to enter at an acute angle to clear suspension linkages.
BFC PRO TIP
Because these EPDM rubber plugs are designed to fit incredibly tightly inside an 8.0mm frame hole to seal out moisture, sliding them over brand-new, high-friction outer shift housing can sometimes be a struggle. Apply a tiny drop of liquid rubbing alcohol (isopropyl alcohol) directly onto the shift housing before sliding the plug into place. The alcohol acts as an instant,
