Maintenance Tip of the Week: Dial In Your Shifting

There's nothing more satisfying than a perfectly tuned drivetrain — and nothing more frustrating than a ghost shift mid-climb. The good news? Getting your shifting dialled in is easier than you think, and you don't need a full workshop to do it.

Signs Your Drivetrain Needs Attention

• Sluggish or hesitant shifts under load
• Chain skipping or "ghost shifting" on climbs
• Noisy drivetrain even after a fresh lube
• Difficulty reaching the largest or smallest cog

Step-by-Step: Basic Derailleur Tune

1. Check cable tension first. Most shifting issues come down to cable stretch, not a bent derailleur. With the chain on the smallest cog, use the barrel adjuster (at the shifter or derailleur) to add tension in half-turn increments until shifts are crisp.

2. Set your limit screws. The H (high) and L (low) limit screws prevent the chain from dropping off either end of the cassette. Shift to each extreme and confirm the derailleur aligns directly over the cog — adjust with a small flathead if needed.

3. Check B-tension. On rear derailleurs, the B-screw controls the gap between the upper jockey wheel and the cassette. Aim for about 5–6mm on most drivetrains (check your manufacturer's spec for 12-speed systems — they're tighter).

4. Inspect cable and housing condition. Frayed cables or cracked housing will undo any adjustment. If your bike is more than a season old and shifting has been off, a cable swap is cheap insurance.

5. Lube the chain. A clean, properly lubed chain is the foundation of smooth shifting. Use a wet lube for wet Vancouver Island conditions, dry lube for summer rides.

Pro Tip

Always make adjustments while pedalling slowly (on a stand or with a friend holding the bike). Small changes have a big effect — patience pays off.

When to Bring It In

If you've worked through these steps and shifting is still off, it may be time for a limit screw reset, a hanger alignment check, or a full cable replacement. Our service team at Brentwood Cycle is happy to take a look — book a tune-up today.

Ride smooth. Ride often.
— The Brentwood Cycle Team