Speedo jumping around
So this is a weird one. I noticed that sometimes my speedometer randomly jumps up to a much higher speed than I am actually going. Like, I am going about 20-30, and it suddenly jumps to 50-60, then back down to what I am actually doing. It happens very briefly and intermittently. Is this more likely to be an electrical problem, or a problem with the hub speed sensor? In a month or two I am going to replace the tires on this thing, so I'll be taking both wheels off then. Should I just order a replacement sensor before then and swap it anyways? Or should I start looking for electrical gremlins now?