Replace Bike Shifters & Shimano Brake Levers | Trek 3500 Rebuild

🔧 This Trek 3500 came into the shop with no brakes, broken shifters, and torn grips — everything on the handlebars was trashed. In this video, I’ll show you exactly how I replaced the shifters, brake levers, grips, cables, and rear derailleur to get this mountain bike shifting and stopping like new again. 🚲 I’m using Shimano combo shifters (ST-EF51 style) and reusing the best parts from my bins to keep the rebuild affordable. You’ll learn how to: • Replace and space combo brake/shifters correctly • Route and tension brake and shifter cables • Install new grips and pads • Adjust limit screws and B-limit on a Shimano Tourney derailleur Whether you’re fixing a neglected Trek 3500 or refreshing an older mountain bike, this step-by-step repair shows you how to bring an old ride back to life. 🧰 Tools Used: cable cutter, hex wrenches, cone wrench, cable ferrules, grease, chain breaker, adjustable wrench ▶️ Watch the full Trek 3500 rebuild series: Part 1 – [Rear Wheel & Axle Rebuild] Part 2 – (this video) Shifters, Brakes & Grips Part 3 – Complete Rebuild & Test Ride 💬 Tell me in the comments: Would you fix a bike like this or buy new? — David | DIY Mountain Bike 🎥 Timestamps: 0:00 Intro & handlebar problems 0:45 Installing new shifters and grips 2:00 Cable routing and setup 5:10 Brake adjustments and pad setup 9:00 Rear derailleur tuning & shifting test 14:20 Final test ride and wrap-up #BikeRepair, #Trek3500, #DIYMTB, #BikeRestoration, #ReplaceBikeShifters, #ShimanoBrakeLever, #BikeCableReplacement, #MountainBike, #BudgetBuild, #BikeMechanic, #BikeUpgrade, #BicycleMaintenance ************************************************************************* I only recommend items I actually OWN and use. The links above may provide a small advertising commission at no added cost to you.