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Drivetrain

Your bike's gear hub and belt: how to use them, keep them in shape, and recognise when something needs attention.

Rohloff SPEEDHUB

Riding your Rohloff: shifting, noises, transportHow to shift the Rohloff SPEEDHUB smoothly, which riding noises are normal, what the break-in means, and how to push and transport your bike.Turning the two cable adjusters on the Rohloff cable box to set the shift cable tension.Twist shifter: play, gear marks and grip rubberHow to check and adjust the play of your Rohloff twist shifter, line up the gear marks, and replace a worn grip rubber yourself.Gebla Rohbox with the cover removed, showing the cable tension positions too loose, perfect and too tight.Gebla Rohbox: adjustment, reset and careHow to adjust and reset the Gebla Rohbox that lets Shimano GRX levers shift your Rohloff hub, how to care for it, and when its cables need replacing.Shimano GRX lever with the cable and its plastic end cap in place.Fitting the cable end cap in a GRX leverWhere the shift cable enters a Shimano GRX lever on Booda bikes with a Gebla Rohbox, and how to fit the plastic cable end cap without tearing the hood.Caring for your Rohloff hubWhat your Rohloff SPEEDHUB needs: gentle cleaning, a few regular checks, the yearly service, and the tightening torques for your workshop.Rohloff oil change kit 8410 with flushing oil, SPEEDHUB OIL, filling hose, syringe and drain screw.Rohloff oil changeWhen and how to change the oil in your Rohloff SPEEDHUB: the interval, the 8410 kit, the exact quantities, the 0.5 Nm drain screw and the winter mix.Pulling the cable box off the Rohloff hub after loosening its knurled screw.Removing and installing the Rohloff rear wheel (A12)Step by step: taking out and refitting the rear wheel of a Booda with a Rohloff A12 thru-axle hub, the cable box, and the 15–20 Nm screw torque.Rohloff fault diagnosisSymptom by symptom: what to check when your Rohloff hub shifts stiffly, slips, misses gears, freezes or shows oil, and when to stop riding.Rohloff hub with a light film of oil and dust around the oil drain screw.Oil traces on my Rohloff hubA light oil film on a Rohloff hub is normal. How to tell a film from a real leak, how to clean it, and why you must never top up oil.Serial number on the housing of a Rohloff SPEEDHUB, circled in red.Rohloff serial numberWhere to find the serial number on your Rohloff SPEEDHUB, why it matters for warranty and in case of theft, and why the sticker must stay on.Gears and gear ratios of the Rohloff SPEEDHUBHow the 14 gears of the Rohloff SPEEDHUB are made, the ratio of every gear, its total range, and the minimum ratio to keep when changing sprockets.

Gates belt drive

Cross-section of a Gates Carbon Drive belt showing the ribbed back, polymer body, carbon tensile cords and nylon tooth facing.Your belt drive at a glanceHow the Gates Carbon Drive belt on your Booda works, why it needs no oil, how it differs from a chain, and the temperature limits of each belt line.Gates illustration of prohibited belt handling, including kinking, twisting, tying and rolling or prying the belt onto a sprocket.Handling the belt without damaging itThe carbon cords in a Gates belt take huge pulling force but break when bent, twisted or levered. The handling rules for fitting, storing and carrying a belt.Gates care illustration showing that sunlight and rinsing with a hose are fine, the approved temperatures, and that the belt must never be oiled.Belt care and inspectionHow to clean the belt drive on your Booda, what never to put on it, and what to look for on the belt, sprockets and crank before you ride.An Allen key on one of the three bolts of the eccentric bottom bracket cap on a Booda frame.Belt tension: checking and adjustingThe target belt tension for gear hub and single-speed Booda models, how to check it, and how to adjust it with the eccentric bottom bracket.Gates illustration comparing a belt running straight on aligned sprockets with a belt walking off misaligned sprockets.Belt alignmentHow to check that the belt runs straight on both sprockets, what misalignment causes, and what you can correct yourself on a Booda frame.Why a Rohloff Booda has no snubberGates recommends a snubber for a belt on a Rohloff hub; Booda leaves it out. Why, and what keeps the belt from skipping instead: the right tension.Belt noise: causes and diagnosisSqueaking, zinging or ticking from the belt drive almost always has one of five causes. How to find which one, in what order, and when to stop riding.A belt in excellent condition next to a worn belt with a shark tooth, a missing tooth, cracks, worn fabric and exposed carbon cords marked.Belt and sprocket wearWhen a Gates belt or sprocket must be replaced, why a belt with hidden damage cannot stay in use, and why a worn sprocket destroys a new belt.Gates illustration warning against rolling a belt onto the sprocket by turning the crank or prying it on with a tool.Fitting a new beltHow a Gates belt comes off and goes on a Booda frame through the splittable seat stay, slackened with the eccentric bottom bracket and never levered on.An Allen key on one of the three bolts of the eccentric bottom bracket cap on a Booda frame.Eccentric bottom bracket bearing changeAdvanced service guide for replacing the bearings in the eccentric bottom bracket of a Booda frame, written for the Shimano Alfine models.

Shimano Alfine

3x3 and single-speed hubs