Originally Posted by
phiretrojan
Popping the clutch when shifting to a lower gear doesn't "lock up" the rear tire unless you've managed to kill the engine in the processes. It may cause the rear tire to temporarily slide, since it could be spinning slower than the road speed, but that is different than being locked. And it's not the sort of thing that is likely to cause a high-side like locking the rear tire with the brake and then releasing it. Still, it will cause the rear to slide around for a second or two, which can cause a bit of nervousness in an inexperienced rider and could cause you to go down if done while in a turn.
let's say that in 3rd gear at a given speed your engine is running at 3000 rpms and in 2nd gear it's running at 4000 rpms at the same speed. If you quickly downshift and let the clutch out without attempting to match engine speed, your engine is still at 3000 rpms but the rear tire wants it to be at 4000. The rear tire can slide until it speeds the engine up to 4000 rpms to match the road speed.
However, if you blip the throttle to get the engine up to 4000 rpms before letting the clutch back out, you're now at the right speed and all will be smooth when you complete the shift.
You don't have to hit 4000 rpms exactly, either. If you're close when you let the clutch back out the rear tire only needs to make the engine change speed by a tiny bit, which shouldn't upset your traction.
The alternative is to let the clutch out slowly, which will also get the engine up to speed without upsetting the rear tire, but that causes more wear on your clutch. Still, it's probably the best choice for a new rider until you get the hang of matching engine speed during downshifts.
It should also be noted, that a downshift that makes your engine go from 1500 rpms to 2000 rpms is much less upsetting to the rear tire than a downshift that makes your engine go from 6000 rpms to 8000 rpms. In other words, if you downshift at low engine speeds, you're pretty safe. If you do it at high engine speeds, you need to match speeds for smooth downshifts.
Jeez .. that's too much to think about on the road ... I don't watch the rev counter to match engine speeds ... just let the engine braking help slow down ...
Yous guys need to ride more ... do what comes naturally ... it flows better that way ...
"So if you meet me, have some sympathy, have some courtesy, have some taste ..."
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