All-New Stumpjumper

The mid-travel trail weapon

All-New Stumpjumper Evo

The rowdy progressive trail rig

Introducing Aethos

One for the riders

Welcome to Chain Reaction

Since Chain Reaction first opened in 2000, we have helped thousands of cyclists achieve their cycling needs and dreams. We support the biking community through events, trail building, rides, seminars and athlete support. Our friendly, helpful staff all ride, from the commuter, the road rider, trail, downhill and BMX. We all have one thing in common, we love bikes and want to help you enjoy them as much as possible.

Call in and meet us, get some advice and maybe take a bike for a spin. We have exceptional gear to offer and want to help you get the most out of your bike.

We are a group of passionate cyclists and skilled individuals. Professional, energetic and engaged in the community, we're happy to share our bike passion with the people of Canterbury. Independently owned, we've been selling and servicing bikes and gear since 2000.

4/218 Moorhouse Ave, Christchurch, NZ
03 943 4925


Mon-Fri 8:30-5:30
Sat 9-5
Sun 10-4

We're on the YouTubes.


McNearly Gnarly | Probably the best jump trail ever!

McNearly Gnarly is a blue jump trail in Queenstown, New Zealand. Good dirt and super well built, this track is just too much fun.

Watch on YouTube


2020 Turbo Levo | Backyard Bike Check

Since we're all locked down in Christchurch, let's make the most of it and do a bike check on the Kitty King's 2020 Specialized Turbo Levo Comp.

Watch on YouTube


Riding the all-new Turbo Levo SL

Our Top to Bottom series features raw footage from our local trails. The bike is a 2020 Specialized Turbo Levo SL Expert, one of our shop test bikes. Weighing only 18kg (39.7lbs), it really is a nimble, fun e-bike and feels just as playful as the Stumpjumper.

Watch on YouTube


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Latest from the blog.


All-New 2021 Stumpjumper

The all-new Stumpjumper combines the lightness and pedalling efficiency of the Epic Evo and capability of the Stumpjumper Evo into one awesome all-around trail bike. From after work trail rides in the Port Hills to all-day Craigieburn missions, this new Stumpjumper is the lightest, most efficient, most all-around capable Stumpjumper ever.

Read on


All-New 2021 Stumpjumper Evo

The all-new Stumpjumper Evo is a capable and lively trail bike built to full-send down the hill with the efficiency to pedal back up. Featuring 160/150mm of front/rear performance tuned travel, new suspension kinematics and maximum adjustability via independent head angle and bottom bracket height adjustment, this bike is a real ripper.

Read on


All-New 2021 Specialized Tarmac

The all-new 2021 Specialized Tarmac is redesigned to be lighter, faster and more aero. Combining the lightness of the Tarmac with the aero of the Venge, the new Tarmac is one bike to rule them all.

Read on


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Comfort, performance and efficiency.

Body Geometry Fit offers benefits to all rider types, mountain or road. It's a comprehensive process that creates the perfect union between bike and body. Our trained Body Geometry Fit technicians can have you on your way to a pleasant, healthy riding experience.

Learn more.

We service all brands of bikes.

We have a professional, comprehensive workshop capable of servicing all bike brands, from a quick tune-up to full suspension servicing and custom builds. The boys have years of experience, are trained up on all the latest and greatest tech and are avid cyclists who care about your bike as much as you do.

Book a service online.


Let's stay in touch.