What is the California law regarding rear-end collisions, CVC 21350 (Basic Speed Law) or CVC 21703 (Following Too Closely)?

a rear-end collision isn't speeding, so that probably isn't what would be charged. Speeding AND rear-ending somebody could result in both charges.

I don't understand your question. Did you rear-end somebody on your bicycle?

The basic speed law has to do with traveling at a speed that is unsafe for the conditions. If the car in front of you was stopped, then your "safe" speed is also zero. It's kind of the generic section that covers both speeding over the posted or prudent speed, but also can cover moving when you shouldn't have been.... even at a low speed.

The question posted is confusing. Bikes are covered under the California vehicle code and most Vehicle code sections dealing with rules of the road apply equally to bikers