Originally Posted by dwhitlow

You got the GSC-10, right? I use it on my bike. You're right about the size, but it does pick up both speed and cadence. Additionally, I have an all-black bike, so it kind of just blends in. All that aside, I've heard lots of stories about these particular sensors dying due to getting excess moisture in the battery compartment, so you may want to be careful with washing your bike, lots of rain riding, etc. I haven't had any problems with mine yet, but maybe I've just been lucky.