The HPX has an unusual feature built into the handle. The handle compressing the expansive tension spring is made of aluminum. The piston uses a plastic washer and cup-shaped rubber "leather" which are crimped onto the end of the plunger shaft. The plunger shaft is made of rolled steel tubing. The plunger assembly, using the handle side plastic compression tube cap, unscrews from the compression tube, and includes the spring loaded handle, plunger shaft and piston. The air chuck has a removable valve face plate so inner reversing parts can be changed to accommodate both Presta or Schraeder valve inflation, though it comes from the factory set for Schraeder valves. The air chuck is forged aluminum alloy and has a thumb lock. The HPX's compression tube is made of aluminum alloy, with a textured Black plastic sleeve over the last five inches near the air chuck as a hand grip. On the HPX's air chuck are two non-marring, nylon plastic "feet" that fit against the B/B shell, and it has a concave nylon top that presses against the seat lug so your frame and its paint finish won't be damaged. The HPX uses a spring mounted in the handle section of the pump's to expand the pump length so it fits tightly between the top of the frame's bottom bracket shell and below the top tube. Unlike the HP model, the HPX doesn't require an "umbrella" clip mounted on the seat tube to retain it tightly on the bike frame. The Zefal HPX largely used by road bike riders, is the successor to the Zefal HP frame pump. JACO is a proud Double Black Diamond Sponsor of the Colorado Mountain Bike Association (COMBA), a registered 501(c)(3) non-profit organization dedicated to the development and preservation of world-class mountain biking trail systems to help improve the health, environment, and economy of local communities through outreach, advocacy, and leadership.Zefal Bicycle Frame & Mini Pumps ZEFAL HPX Road and Mountain Bicycle FRAME PUMP Proudly backed by our 100% Lifetime Warranty! Nozzle quickly threads onto the valve stem. 7 inch air hose provides optimal reach to the valve stem of your suspension components.Integrated air bleeder valve lets you quickly release air from overinflated components.Ultra durable, portable design ideal for keeping in your MTB trail bag or tool kit.Built-in 300 PSI gauge calibrate accurate to ANSI B40.1 accuracy standard.Ideal for setting, adjusting, and fine tuning the pressure of your front & rear shocks, air forks, and dropper seat posts.Built to last from high performance aluminum & ABS parts, ensuring your shock pump stays reliable for many miles of endless adventures out on the trails.Designed, engineered, and performance tested in the Rocky Mountains of Colorado by our team of MTB enthusiasts with over 35 years of experience in the industry.Application: Mountain Bike Suspension Tuning.Components: Front & Rear Shocks, Air Forks, Dropper Seat Posts.The all-new ShockPro is a professional-grade tool that lets you dial in the pressure settings of your MTB air suspension components, so you can maximize the power of your bike & conquer any terrain the trails throw at you. Trusted by professionals & built to last for many miles of adventures out on the trails. ShockPro Mountain Bike Shock Pump - 300 PSI
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