Bike Check and Tools
Checking your bike quickly before each ride will make sure the ride goes smoothly and safely. 

Front wheel - quick release tight, wheel spins true, no bearing movement, tyre inflated, spokes
 
Handlebar - brake check, headset movement, bars straight, batteries charged
Crank - gears change, no bottom bracket bearing movement, pedals spinning, chain lubed 
Seat - saddle secure, seatpost correct height 
Rear Wheel - gears change, wheel spins true, no bearing movement, tyre inflated, spokes

Depending on your bike setup, these tools would be useful to bring

Puncture repair kit, spare tube, tyre levers
Pump or CO2 cartridges
Multi-tool, allen keys, chain splitter
Quick Release Chain link
Emergency cash, Phone, Lights, ID, zipties!
Food, energy bars, gels, water