If you like the world of two wheels, you may have heard the term «rev matching», or something about matching the engine speed to the wheel speed, but first of all it’s important to note that «rev matching» is a technique used by motorcyclists to synchronize the engine speed with the rotation of the rear wheel during a very important moment: downshifting. The aim is to smooth the transition between gear changes, avoiding jerks or sudden braking.
When a rider downshifts without adjusting the engine speed, a mechanical shock can occur because the engine suddenly has to increase its speed to match the new gear. Rev matching eliminates this problem by temporarily raising the engine revs before engaging the lower gear.
How does the engine work and why is rev matching important?
A motorcycle’s engine works by converting the explosion of fuel into mechanical movement. In each gear, the engine works together with the gearbox to transfer the power to the rear wheel. When downshifting, the engine needs to accelerate to match the lower gear ratio.
Without rev matching, abrupt downshifting can cause sudden deceleration of the rear wheel, resulting in excessive wear on the clutch and engine components. This can also compromise the bike’s stability, especially in bends or on slippery surfaces.
Advantages of rev matching
- Reduces clutch wear: By synchronizing the engine revs with the new gear, friction in the clutch is reduced, extending its life.
- Improves stability: The smooth transition between gears prevents jolts that can destabilize the bike.
- Smoother ride: The technique provides a more fluid and comfortable riding experience, especially during hard braking or sporty riding.
- Protects the engine: Minimizes mechanical shock to the engine’s internal components, preserving its integrity.
How do I rev match?
- Decelerate: Start by decelerating gently before downshifting.
- Disengage: Pull in the clutch to disconnect the engine from the transmission.
- Increase Revolutions: With the clutch still pulled in, give the throttle a little tap to bring the engine revs up to the appropriate level for the next gear.
- Engage Lower Gear: Smoothly downshifts while maintaining high revs.
- Release the Clutch: Gradually release the clutch to re-establish the connection between the engine and transmission.
Although this technique may seem strange to many, you’ve probably seen it, or at least heard of it. Haven’t you ever wondered why sometimes when motorcycles are slowing down or coming to a stop you suddenly hear the engine «singing» louder? That’s probably why, and don’t think it’s just because of the audible impact in this case, but because it’s also good for the bike.
And between you and me, if you can combine greater safety when braking or downshifting, save the engine and still make yourself noticed – even for safety reasons – as well as giving it a more technical look, why not do it? It’s all good reasons, so go ahead, and learn this.